diff --git a/pkg/obichunk/chunk_on_disk.go b/pkg/obichunk/chunk_on_disk.go
index 4b7fe61..c378c00 100644
--- a/pkg/obichunk/chunk_on_disk.go
+++ b/pkg/obichunk/chunk_on_disk.go
@@ -2,7 +2,6 @@ package obichunk
 
 import (
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -14,7 +13,7 @@ import (
 )
 
 func tempDir() (string, error) {
-	dir, err := ioutil.TempDir(os.TempDir(), "obiseq_chunks_")
+	dir, err := os.MkdirTemp(os.TempDir(), "obiseq_chunks_")
 	if err != nil {
 		return "", err
 	}
diff --git a/pkg/obiformats/ngsfilter_read.go b/pkg/obiformats/ngsfilter_read.go
index 7ed1e7a..ef51e37 100644
--- a/pkg/obiformats/ngsfilter_read.go
+++ b/pkg/obiformats/ngsfilter_read.go
@@ -249,6 +249,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalln("Invalid value for @spacer parameter")
 			}
 
+			log.Infof("Set global spacer to %d bp", spacer)
 			library.SetTagSpacer(spacer)
 		case 2:
 			primer := values[0]
@@ -258,6 +259,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalln("Invalid value for @spacer parameter")
 			}
 
+			log.Infof("Set spacer for primer %s to %d bp", primer, spacer)
 			library.SetTagSpacerFor(primer, spacer)
 		default:
 			log.Fatalln("Invalid value for @spacer parameter")
@@ -274,6 +276,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalln("Invalid value for @forward_spacer parameter")
 			}
 
+			log.Infof("Set spacer for forward primer to %d bp", spacer)
 			library.SetForwardTagSpacer(spacer)
 		default:
 			log.Fatalln("Invalid value for @forward_spacer parameter")
@@ -290,6 +293,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalln("Invalid value for @reverse_spacer parameter")
 			}
 
+			log.Infof("Set spacer for reverse primer to %d bp", spacer)
 			library.SetReverseTagSpacer(spacer)
 		default:
 			log.Fatalln("Invalid value for @reverse_spacer parameter")
@@ -301,9 +305,13 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			log.Fatalln("Missing value for @tag_delimiter parameter")
 		case 1:
 			value := []byte(values[0])[0]
+
+			log.Infof("Set global tag delimiter to %c", value)
 			library.SetTagDelimiter(value)
 		case 2:
 			value := []byte(values[1])[0]
+
+			log.Infof("Set tag delimiter for primer %s to %c", values[0], value)
 			library.SetTagDelimiterFor(values[0], value)
 		default:
 			log.Fatalln("Invalid value for @tag_delimiter parameter")
@@ -315,6 +323,8 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			log.Fatalln("Missing value for @forward_tag_delimiter parameter")
 		case 1:
 			value := []byte(values[0])[0]
+
+			log.Infof("Set tag delimiter for forward primer to %c", value)
 			library.SetForwardTagDelimiter(value)
 		default:
 			log.Fatalln("Invalid value for @forward_tag_delimiter parameter")
@@ -326,6 +336,8 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			log.Fatalln("Missing value for @reverse_tag_delimiter parameter")
 		case 1:
 			value := []byte(values[0])[0]
+
+			log.Infof("Set tag delimiter for reverse primer to %c", value)
 			library.SetReverseTagDelimiter(value)
 		default:
 			log.Fatalln("Invalid value for @reverse_tag_delimiter parameter")
@@ -339,6 +351,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			if err := library.SetMatching(values[0]); err != nil {
 				log.Fatalf("Invalid value %s for @matching parameter", values[0])
 			}
+			log.Infof("Set tag matching mode to %s", values[0])
 		default:
 			log.Fatalln("Invalid value for @matching parameter")
 		}
@@ -354,6 +367,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalf("Invalid value %s for @primer_error parameter", values[0])
 			}
 
+			log.Infof("Set global allowed primer mismatches to %d", dist)
 			library.SetAllowedMismatches(dist)
 		case 2:
 			primer := values[0]
@@ -363,6 +377,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalf("Invalid value %s for @primer_error parameter", values[1])
 			}
 
+			log.Infof("Set allowed primer mismatches for primer %s to %d", primer, dist)
 			library.SetAllowedMismatchesFor(primer, dist)
 		default:
 			log.Fatalln("Invalid value for @primer_error parameter")
@@ -379,6 +394,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalf("Invalid value %s for @forward_primer_error parameter", values[0])
 			}
 
+			log.Infof("Set allowed mismatches for forward primer to %d", dist)
 			library.SetForwardAllowedMismatches(dist)
 		default:
 			log.Fatalln("Invalid value for @forward_primer_error parameter")
@@ -395,6 +411,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalf("Invalid value %s for @reverse_primer_error parameter", values[0])
 			}
 
+			log.Infof("Set allowed mismatches for reverse primer to %d", dist)
 			library.SetReverseAllowedMismatches(dist)
 		default:
 			log.Fatalln("Invalid value for @reverse_primer_error parameter")
@@ -410,6 +427,8 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			if err != nil {
 				log.Fatalf("Invalid value %s for @tag_indels parameter", values[0])
 			}
+
+			log.Infof("Set global maximum tag indels to %d", indels)
 			library.SetTagIndels(indels)
 		case 2:
 			indels, err := strconv.Atoi(values[1])
@@ -418,6 +437,7 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 				log.Fatalf("Invalid value %s for @tag_indels parameter", values[1])
 			}
 
+			log.Infof("Set maximum tag indels for primer %s to %d", values[0], indels)
 			library.SetTagIndelsFor(values[0], indels)
 		}
 	},
@@ -432,6 +452,8 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			if err != nil {
 				log.Fatalf("Invalid value %s for @forward_tag_indels parameter", values[0])
 			}
+
+			log.Infof("Set maximum tag indels for forward primer to %d", indels)
 			library.SetForwardTagIndels(indels)
 		default:
 			log.Fatalln("Invalid value for @forward_tag_indels parameter")
@@ -447,6 +469,8 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 			if err != nil {
 				log.Fatalf("Invalid value %s for @reverse_tag_indels parameter", values[0])
 			}
+
+			log.Infof("Set maximum tag indels for reverse primer to %d", indels)
 			library.SetReverseTagIndels(indels)
 		default:
 			log.Fatalln("Invalid value for @reverse_tag_indels parameter")
@@ -457,8 +481,22 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 		case 0:
 			log.Fatalln("Missing value for @indels parameter")
 		case 1:
+
+			if values[0] == "true" {
+				log.Info("Allows indels for primer matching")
+			} else {
+				log.Info("Disallows indels for primer matching")
+			}
+
 			library.SetAllowsIndels(values[0] == "true")
 		case 2:
+
+			if values[1] == "true" {
+				log.Infof("Allows indels for primer matching %s", values[0])
+			} else {
+				log.Infof("Disallows indels for primer matching %s", values[0])
+			}
+
 			library.SetAllowsIndelsFor(values[0], values[1] == "true")
 		default:
 			log.Fatalln("Invalid value for @indels parameter")
@@ -470,6 +508,12 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 		case 0:
 			log.Fatalln("Missing value for @forward_indels parameter")
 		case 1:
+			if values[0] == "true" {
+				log.Info("Allows indels for forward primer matching")
+			} else {
+				log.Info("Disallows indels for forward primer matching")
+			}
+
 			library.SetForwardAllowsIndels(values[0] == "true")
 		default:
 			log.Fatalln("Invalid value for @forward_indels parameter")
@@ -480,6 +524,11 @@ var library_parameter = map[string]func(library *obingslibrary.NGSLibrary, value
 		case 0:
 			log.Fatalln("Missing value for @reverse_indels parameter")
 		case 1:
+			if values[0] == "true" {
+				log.Info("Allows indels for reverse primer matching")
+			} else {
+				log.Info("Disallows indels for reverse primer matching")
+			}
 			library.SetReverseAllowsIndels(values[0] == "true")
 		default:
 			log.Fatalln("Invalid value for @reverse_indels parameter")
diff --git a/pkg/obikmer/debruijn.go b/pkg/obikmer/debruijn.go
index 3bafddd..133304c 100644
--- a/pkg/obikmer/debruijn.go
+++ b/pkg/obikmer/debruijn.go
@@ -607,7 +607,7 @@ func (g *DeBruijnGraph) HaviestPath() []uint64 {
 		}
 	}
 
-	log.Infof("Heaviest node: %d [%v]", heaviestNode, heaviestWeight)
+	log.Debugf("Heaviest node: %d [%v]", heaviestNode, heaviestWeight)
 	// Reconstruct the path from the start node to the heaviest node found
 	heaviestPath := make([]uint64, 0)
 	currentNode := heaviestNode
diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index 14ad09d..9eae625 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -7,7 +7,7 @@ import (
 // TODO: The version number is extracted from git. This induces that the version
 // corresponds to the last commit, and not the one when the file will be
 // commited
-var _Commit = "f265a39"
+var _Commit = "4d86483"
 var _Version = "Release 4.2.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obiseq/attributes.go b/pkg/obiseq/attributes.go
index afdc142..10ee503 100644
--- a/pkg/obiseq/attributes.go
+++ b/pkg/obiseq/attributes.go
@@ -415,11 +415,16 @@ func (s *BioSequence) SetTaxid(taxid int) {
 	s.SetAttribute("taxid", taxid)
 }
 
-func (s *BioSequence) OBITagRefIndex() map[int]string {
+func (s *BioSequence) OBITagRefIndex(slot ...string) map[int]string {
+	key := "obitag_ref_index"
+
+	if len(slot) > 0 {
+		key = slot[0]
+	}
 
 	var val map[int]string
 
-	i, ok := s.GetAttribute("obitag_ref_index")
+	i, ok := s.GetAttribute(key)
 
 	if !ok {
 		return nil
diff --git a/pkg/obiseq/language.go b/pkg/obiseq/language.go
index 3200d48..a79c66a 100644
--- a/pkg/obiseq/language.go
+++ b/pkg/obiseq/language.go
@@ -202,4 +202,8 @@ var OBILang = gval.NewLanguage(
 			scomp[string(k)] = float64(v)
 		}
 		return scomp, nil
-	}))
+	}),
+	gval.Function("replace", func(args ...interface{}) (interface{}, error) {
+		return strings.ReplaceAll(args[0].(string), args[1].(string), args[2].(string)), nil
+	}),
+)
diff --git a/pkg/obitax/sequence_methods.go b/pkg/obitax/sequence_methods.go
index 8623eab..384a14f 100644
--- a/pkg/obitax/sequence_methods.go
+++ b/pkg/obitax/sequence_methods.go
@@ -66,3 +66,27 @@ func (taxonomy *Taxonomy) SetPath(sequence *obiseq.BioSequence) string {
 
 	return tpath
 }
+
+func (taxonomy *Taxonomy) SetScientificName(sequence *obiseq.BioSequence) string {
+	taxid, err := taxonomy.Taxon(sequence.Taxid())
+
+	if err != nil {
+		log.Fatalf("Taxid %d not defined in the current taxonomy", sequence.Taxid())
+	}
+
+	sequence.SetAttribute("scienctific_name", taxid.ScientificName())
+
+	return taxid.ScientificName()
+}
+
+func (taxonomy *Taxonomy) SetTaxonomicRank(sequence *obiseq.BioSequence) string {
+	taxid, err := taxonomy.Taxon(sequence.Taxid())
+
+	if err != nil {
+		log.Fatalf("Taxid %d not defined in the current taxonomy", sequence.Taxid())
+	}
+
+	sequence.SetAttribute("taxonomic_rank", taxid.Rank())
+
+	return taxid.Rank()
+}
diff --git a/pkg/obitax/sequence_predicate.go b/pkg/obitax/sequence_predicate.go
index b7381b2..551a5a8 100644
--- a/pkg/obitax/sequence_predicate.go
+++ b/pkg/obitax/sequence_predicate.go
@@ -57,6 +57,23 @@ func (taxonomy *Taxonomy) IsSubCladeOf(taxid int) obiseq.SequencePredicate {
 	return f
 }
 
+func (taxonomy *Taxonomy) IsSubCladeOfSlot(key string) obiseq.SequencePredicate {
+
+	f := func(sequence *obiseq.BioSequence) bool {
+		val, ok := sequence.GetStringAttribute(key)
+
+		if ok {
+			parent, err1 := taxonomy.Taxon(val)
+			taxon, err2 := taxonomy.Taxon(sequence.Taxid())
+			return err1 == nil && err2 == nil && taxon.IsSubCladeOf(parent)
+		}
+
+		return false
+	}
+
+	return f
+}
+
 func (taxonomy *Taxonomy) HasRequiredRank(rank string) obiseq.SequencePredicate {
 
 	if !obiutils.Contains(taxonomy.RankList(), rank) {
diff --git a/pkg/obitax/taxonomy.go b/pkg/obitax/taxonomy.go
index 4d4ee65..787f513 100644
--- a/pkg/obitax/taxonomy.go
+++ b/pkg/obitax/taxonomy.go
@@ -2,6 +2,8 @@ package obitax
 
 import (
 	"fmt"
+	"regexp"
+	"strconv"
 )
 
 type TaxName struct {
@@ -54,11 +56,43 @@ func (taxonomy *Taxonomy) AddNewTaxa(taxid, parent int, rank string, replace boo
 	return n, nil
 }
 
-func (taxonomy *Taxonomy) Taxon(taxid int) (*TaxNode, error) {
-	t, ok := (*taxonomy.nodes)[taxid]
+// func (taxonomy *Taxonomy) Taxon(taxid int) (*TaxNode, error) {
+// 	t, ok := (*taxonomy.nodes)[taxid]
+
+// 	if !ok {
+// 		a, aok := taxonomy.alias[taxid]
+// 		if !aok {
+// 			return nil, fmt.Errorf("Taxid %d is not part of the taxonomy", taxid)
+// 		}
+// 		t = a
+// 	}
+// 	return t, nil
+// }
+
+func (taxonomy *Taxonomy) Taxon(taxid interface{}) (*TaxNode, error) {
+	var itaxid int
+	var err error
+
+	switch v := taxid.(type) {
+	case int:
+		itaxid = v
+	case string:
+		itaxid, err = strconv.Atoi(v)
+
+		if err != nil {
+			re := regexp.MustCompile(`TX:(\d+)`)
+			parts := re.FindStringSubmatch(v)
+			if len(parts) != 2 {
+				return nil, fmt.Errorf("I cannot parse taxid from %s", v)
+			}
+			itaxid, _ = strconv.Atoi(parts[1])
+		}
+	}
+
+	t, ok := (*taxonomy.nodes)[itaxid]
 
 	if !ok {
-		a, aok := taxonomy.alias[taxid]
+		a, aok := taxonomy.alias[itaxid]
 		if !aok {
 			return nil, fmt.Errorf("Taxid %d is not part of the taxonomy", taxid)
 		}
@@ -66,7 +100,6 @@ func (taxonomy *Taxonomy) Taxon(taxid int) (*TaxNode, error) {
 	}
 	return t, nil
 }
-
 func (taxonomy *Taxonomy) AddNewName(taxid int, name, nameclass *string) error {
 	node, node_err := taxonomy.Taxon(taxid)
 	if node_err != nil {
diff --git a/pkg/obitools/obiannotate/obiannotate.go b/pkg/obitools/obiannotate/obiannotate.go
index a3b48c8..585812c 100644
--- a/pkg/obitools/obiannotate/obiannotate.go
+++ b/pkg/obitools/obiannotate/obiannotate.go
@@ -215,6 +215,24 @@ func AddTaxonAtRankWorker(taxonomy *obitax.Taxonomy, ranks ...string) obiseq.Seq
 	return f
 }
 
+func AddTaxonRankWorker(taxonomy *obitax.Taxonomy) obiseq.SeqWorker {
+	f := func(s *obiseq.BioSequence) (obiseq.BioSequenceSlice, error) {
+		taxonomy.SetTaxonomicRank(s)
+		return obiseq.BioSequenceSlice{s}, nil
+	}
+
+	return f
+}
+
+func AddScientificNameWorker(taxonomy *obitax.Taxonomy) obiseq.SeqWorker {
+	f := func(s *obiseq.BioSequence) (obiseq.BioSequenceSlice, error) {
+		taxonomy.SetScientificName(s)
+		return obiseq.BioSequenceSlice{s}, nil
+	}
+
+	return f
+}
+
 func AddSeqLengthWorker() obiseq.SeqWorker {
 	f := func(s *obiseq.BioSequence) (obiseq.BioSequenceSlice, error) {
 		s.SetAttribute("seq_length", s.Len())
@@ -266,6 +284,18 @@ func CLIAnnotationWorker() obiseq.SeqWorker {
 		annotator = annotator.ChainWorkers(w)
 	}
 
+	if CLISetTaxonomicRank() {
+		taxo := obigrep.CLILoadSelectedTaxonomy()
+		w := AddTaxonRankWorker(taxo)
+		annotator = annotator.ChainWorkers(w)
+	}
+
+	if CLISetScientificName() {
+		taxo := obigrep.CLILoadSelectedTaxonomy()
+		w := AddScientificNameWorker(taxo)
+		annotator = annotator.ChainWorkers(w)
+	}
+
 	if CLIHasAddLCA() {
 		taxo := obigrep.CLILoadSelectedTaxonomy()
 		w := obitax.AddLCAWorker(taxo, CLILCASlotName(), CLILCAThreshold())
diff --git a/pkg/obitools/obiannotate/options.go b/pkg/obitools/obiannotate/options.go
index 291f74f..f7e722e 100644
--- a/pkg/obitools/obiannotate/options.go
+++ b/pkg/obitools/obiannotate/options.go
@@ -32,6 +32,8 @@ var _lcaError = 0.0
 var _setId = ""
 var _cut = ""
 var _taxonomicPath = false
+var _withRank = false
+var _withScientificName = false
 
 func SequenceAnnotationOptionSet(options *getoptions.GetOpt) {
 	// options.BoolVar(&_addRank, "seq-rank", _addRank,
@@ -117,6 +119,12 @@ func SequenceAnnotationOptionSet(options *getoptions.GetOpt) {
 	options.BoolVar(&_taxonomicPath, "taxonomic-path", _taxonomicPath,
 		options.Description("Annotate the sequence with its taxonomic path"))
 
+	options.BoolVar(&_withRank, "taxonomic-rank", _withRank,
+		options.Description("Annotate the sequence with its taxonomic rank"))
+
+	options.BoolVar(&_withScientificName, "scientific-name", _withScientificName,
+		options.Description("Annotate the sequence with its scientific name"))
+
 	// options.StringVar(&_tagList, "tag-list", _tagList,
 	// 	options.ArgName("FILENAME"),
 	// 	options.Description("<FILENAME> points to a file containing attribute names"+
@@ -307,3 +315,11 @@ func CLIPatternInDels() bool {
 func CLISetTaxonomicPath() bool {
 	return _taxonomicPath
 }
+
+func CLISetTaxonomicRank() bool {
+	return _withRank
+}
+
+func CLISetScientificName() bool {
+	return _withScientificName
+}
diff --git a/pkg/obitools/obiconsensus/obiconsensus.go b/pkg/obitools/obiconsensus/obiconsensus.go
index cc1fd9c..544b3bd 100644
--- a/pkg/obitools/obiconsensus/obiconsensus.go
+++ b/pkg/obitools/obiconsensus/obiconsensus.go
@@ -52,7 +52,7 @@ func BuildConsensus(seqs obiseq.BioSequenceSlice,
 
 	}
 
-	log.Printf("Number of reads : %d\n", len(seqs))
+	log.Debugf("Number of reads : %d\n", len(seqs))
 
 	if kmer_size < 0 {
 		longest := make([]int, len(seqs))
@@ -64,7 +64,7 @@ func BuildConsensus(seqs obiseq.BioSequenceSlice,
 		}
 
 		kmer_size = slices.Max(longest) + 1
-		log.Printf("estimated kmer size : %d", kmer_size)
+		log.Debugf("estimated kmer size : %d", kmer_size)
 	}
 
 	var graph *obikmer.DeBruijnGraph
@@ -80,7 +80,7 @@ func BuildConsensus(seqs obiseq.BioSequenceSlice,
 		}
 
 		kmer_size++
-		log.Infof("Cycle detected, increasing kmer size to %d\n", kmer_size)
+		log.Debugf("Cycle detected, increasing kmer size to %d\n", kmer_size)
 	}
 
 	if save_graph {
@@ -96,7 +96,7 @@ func BuildConsensus(seqs obiseq.BioSequenceSlice,
 		}
 	}
 
-	log.Printf("Graph size : %d\n", graph.Len())
+	log.Debugf("Graph size : %d\n", graph.Len())
 	total_kmer := graph.Len()
 
 	seq, err := graph.LongestConsensus(consensus_id)
@@ -260,6 +260,21 @@ func MinionDenoise(graph *obigraph.Graph[*obiseq.BioSequence, Mutation],
 	sample_key string, kmer_size int) obiseq.BioSequenceSlice {
 	denoised := obiseq.MakeBioSequenceSlice(len(*graph.Vertices))
 
+	bar := (*progressbar.ProgressBar)(nil)
+	if obiconvert.CLIProgressBar() {
+
+		pbopt := make([]progressbar.Option, 0, 5)
+		pbopt = append(pbopt,
+			progressbar.OptionSetWriter(os.Stderr),
+			progressbar.OptionSetWidth(15),
+			progressbar.OptionShowIts(),
+			progressbar.OptionSetPredictTime(true),
+			progressbar.OptionSetDescription(fmt.Sprintf("[Build consensus] on %s", graph.Name)),
+		)
+
+		bar = progressbar.NewOptions(len(*graph.Vertices), pbopt...)
+	}
+
 	for i, v := range *graph.Vertices {
 		var err error
 		var clean *obiseq.BioSequence
@@ -283,6 +298,7 @@ func MinionDenoise(graph *obigraph.Graph[*obiseq.BioSequence, Mutation],
 				clean.SetAttribute("obiconsensus_consensus", true)
 			}
 			pack.Recycle(false)
+
 		} else {
 			clean = obiseq.NewBioSequence(v.Id(), v.Sequence(), v.Definition())
 			clean.SetAttribute("obiconsensus_consensus", false)
@@ -295,7 +311,20 @@ func MinionDenoise(graph *obigraph.Graph[*obiseq.BioSequence, Mutation],
 			clean.SetAttribute("obiconsensus_weight", int(1))
 		}
 
+		annotations := v.Annotations()
+
+		for k, v := range annotations {
+			if !clean.HasAttribute(k) {
+				clean.SetAttribute(k, v)
+			}
+		}
+
 		denoised[i] = clean
+
+		if bar != nil {
+			bar.Add(1)
+		}
+
 	}
 
 	return denoised
diff --git a/pkg/obitools/obigrep/options.go b/pkg/obitools/obigrep/options.go
index 5f393f4..7b5cf6c 100644
--- a/pkg/obitools/obigrep/options.go
+++ b/pkg/obitools/obigrep/options.go
@@ -1,6 +1,7 @@
 package obigrep
 
 import (
+	"strconv"
 	"strings"
 
 	log "github.com/sirupsen/logrus"
@@ -13,7 +14,7 @@ import (
 	"github.com/DavidGamba/go-getoptions"
 )
 
-var _BelongTaxa = make([]int, 0)
+var _BelongTaxa = make([]string, 0)
 var _NotBelongTaxa = make([]int, 0)
 var _RequiredRanks = make([]string, 0)
 
@@ -48,7 +49,7 @@ func TaxonomySelectionOptionSet(options *getoptions.GetOpt) {
 		options.Alias("t"),
 		options.Description("Points to the directory containing the NCBI Taxonomy database dump."))
 
-	options.IntSliceVar(&_BelongTaxa, "restrict-to-taxon", 1, 1,
+	options.StringSliceVar(&_BelongTaxa, "restrict-to-taxon", 1, 1,
 		options.Alias("r"),
 		options.ArgName("TAXID"),
 		options.Description("Require that the actual taxon of the sequence belongs the provided taxid."))
@@ -231,13 +232,27 @@ func CLILoadSelectedTaxonomy() *obitax.Taxonomy {
 }
 
 func CLIRestrictTaxonomyPredicate() obiseq.SequencePredicate {
+	var p obiseq.SequencePredicate
+	var p2 obiseq.SequencePredicate
 
 	if len(_BelongTaxa) > 0 {
 		taxonomy := CLILoadSelectedTaxonomy()
-		p := taxonomy.IsSubCladeOf(_BelongTaxa[0])
 
-		for _, taxid := range _BelongTaxa[1:] {
-			p = p.Or(taxonomy.IsSubCladeOf(taxid))
+		taxid, err := strconv.Atoi(_BelongTaxa[0])
+		if err != nil {
+			p = taxonomy.IsSubCladeOfSlot(_BelongTaxa[0])
+		} else {
+			p = taxonomy.IsSubCladeOf(taxid)
+		}
+		for _, staxid := range _BelongTaxa[1:] {
+			taxid, err := strconv.Atoi(staxid)
+			if err != nil {
+				p2 = taxonomy.IsSubCladeOfSlot(staxid)
+			} else {
+				p2 = taxonomy.IsSubCladeOf(taxid)
+			}
+
+			p = p.Or(p2)
 		}
 
 		return p
diff --git a/pkg/obitools/obijoin/join.go b/pkg/obitools/obijoin/join.go
index a8f5520..1f087ab 100644
--- a/pkg/obitools/obijoin/join.go
+++ b/pkg/obitools/obijoin/join.go
@@ -12,21 +12,32 @@ import (
 
 type IndexedSequenceSlice struct {
 	Sequences obiseq.BioSequenceSlice
-	Indices   []map[interface{}]*obiutils.Set[int]
+	Indices   []map[string]*obiutils.Set[int]
 }
 
 func (s IndexedSequenceSlice) Len() int {
 	return len(s.Sequences)
 }
 
-func (s IndexedSequenceSlice) Get(keys ...interface{}) *obiseq.BioSequenceSlice {
+func (s IndexedSequenceSlice) Get(keys ...string) *obiseq.BioSequenceSlice {
 	var keeps obiutils.Set[int]
 
 	for i, v := range s.Indices {
+
 		if i == 0 {
-			keeps = *v[keys[0]]
+			p, ok := v[keys[0]]
+			if !ok {
+				keeps = obiutils.MakeSet[int]()
+				break
+			}
+			keeps = *p
 		} else {
-			keeps = keeps.Intersection(*v[keys[i]])
+			p, ok := v[keys[i]]
+			if !ok {
+				keeps = obiutils.MakeSet[int]()
+				break
+			}
+			keeps = keeps.Intersection(*p)
 		}
 	}
 
@@ -39,14 +50,14 @@ func (s IndexedSequenceSlice) Get(keys ...interface{}) *obiseq.BioSequenceSlice
 }
 
 func BuildIndexedSequenceSlice(seqs obiseq.BioSequenceSlice, keys []string) IndexedSequenceSlice {
-	indices := make([]map[interface{}]*obiutils.Set[int], len(keys))
+	indices := make([]map[string]*obiutils.Set[int], len(keys))
 
 	for i, k := range keys {
-		idx := make(map[interface{}]*obiutils.Set[int])
+		idx := make(map[string]*obiutils.Set[int])
 
 		for j, seq := range seqs {
 
-			if value, ok := seq.GetAttribute(k); ok {
+			if value, ok := seq.GetStringAttribute(k); ok {
 				goods, ok := idx[value]
 				if !ok {
 					goods = obiutils.NewSet[int]()
@@ -67,10 +78,10 @@ func MakeJoinWorker(by []string, index IndexedSequenceSlice, updateId, updateSeq
 	f := func(sequence *obiseq.BioSequence) (obiseq.BioSequenceSlice, error) {
 		var ok bool
 
-		keys := make([]interface{}, len(by))
+		keys := make([]string, len(by))
 
 		for i, v := range by {
-			keys[i], ok = sequence.GetAttribute(v)
+			keys[i], ok = sequence.GetStringAttribute(v)
 			if !ok {
 				return obiseq.BioSequenceSlice{sequence}, nil
 			}
diff --git a/pkg/obitools/obitag2/obitag.go b/pkg/obitools/obitag2/obitag.go
new file mode 100644
index 0000000..00af2e3
--- /dev/null
+++ b/pkg/obitools/obitag2/obitag.go
@@ -0,0 +1,460 @@
+package obitag2
+
+import (
+	"sort"
+	"strconv"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/exp/maps"
+	"golang.org/x/exp/slices"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obialign"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obikmer"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+)
+
+type Obitag2Match struct {
+	Taxon  *obitax.TaxNode
+	Id     string
+	Weight int
+}
+type Obitag2RefDB struct {
+	Taxonomy *obitax.Taxonomy
+
+	Full       *obiseq.BioSequenceSlice
+	FullCounts *[]*obikmer.Table4mer
+	FullTaxa   *obitax.TaxonSet
+
+	Clusters      *obiseq.BioSequenceSlice
+	ClusterCounts *[]*obikmer.Table4mer
+	ClusterTaxa   *obitax.TaxonSet
+
+	Families     *map[int]*obiseq.BioSequenceSlice
+	FamilyCounts *map[int]*[]*obikmer.Table4mer
+	FamilyTaxa   *map[int]obitax.TaxonSet
+
+	ExactTaxid *map[string]*Obitag2Match
+}
+
+// MatchDistanceIndex returns the taxid, rank, and scientificName based on the given distance and distanceIdx.
+//
+// Parameters:
+// - distance: The distance to match against the keys in distanceIdx.
+// - distanceIdx: A map containing distances as keys and corresponding values in the format "taxid@rank@scientificName".
+//
+// Returns:
+// - taxid: The taxid associated with the matched distance.
+// - rank: The rank associated with the matched distance.
+// - scientificName: The scientific name associated with the matched distance.
+func MatchDistanceIndex(distance int, distanceIdx map[int]string) (int, string, string) {
+	keys := maps.Keys(distanceIdx)
+	slices.Sort(keys)
+
+	i := sort.Search(len(keys), func(i int) bool {
+		return distance <= keys[i]
+	})
+
+	var taxid int
+	var rank string
+	var scientificName string
+
+	if i == len(keys) || distance > keys[len(keys)-1] {
+		taxid = 1
+		rank = "no rank"
+		scientificName = "root"
+	} else {
+		parts := strings.Split(distanceIdx[keys[i]], "@")
+		taxid, _ = strconv.Atoi(parts[0])
+		rank = parts[1]
+		scientificName = parts[2]
+	}
+
+	// log.Info("taxid:", taxid, " rank:", rank, " scientificName:", scientificName)
+
+	return taxid, rank, scientificName
+}
+
+// FindClosests finds the closest bio sequence from a given sequence and a slice of reference sequences.
+//
+// Parameters:
+// - sequence: the bio sequence to find the closest matches for.
+// - references: a slice of reference sequences to compare against.
+// - refcounts: a slice of reference sequence counts.
+// - runExact: a boolean flag indicating whether to run an exact match.
+//
+// Returns:
+// - bests: a slice of the closest bio sequences.
+// - maxe: the maximum score.
+// - bestId: the best ID.
+// - bestmatch: the best match.
+// - bestidxs: a slice of the best indexes.
+func FindClosests(sequence *obiseq.BioSequence,
+	references obiseq.BioSequenceSlice,
+	refcounts []*obikmer.Table4mer,
+	runExact bool) (obiseq.BioSequenceSlice, int, float64, string, []int) {
+
+	var matrix []uint64
+
+	seqwords := obikmer.Count4Mer(sequence, nil, nil)
+	cw := make([]int, len(refcounts))
+
+	for i, ref := range refcounts {
+		cw[i] = obikmer.Common4Mer(seqwords, ref)
+	}
+
+	o := obiutils.Reverse(obiutils.IntOrder(cw), true)
+
+	bests := obiseq.MakeBioSequenceSlice()
+	//	bests = append(bests, references[o[0]])
+	bestidxs := make([]int, 0)
+	//	bestidxs = append(bestidxs, o[0])
+	bestId := 0.0
+	bestmatch := references[o[0]].Id()
+
+	maxe := -1
+	wordmin := 0
+
+	// sss := make([]int, 0, 10000)
+	// log.Warnf("%v\n%v\n%d", seqwords, refcounts[o[0]], obikmer.Common4Mer(seqwords, refcounts[o[0]]))
+
+	for i, order := range o {
+		ref := references[order]
+		score := int(1e9)
+
+		if cw[order] < wordmin || i > 1000 {
+			break
+		}
+		lcs, alilength := -1, -1
+		switch maxe {
+		case 0:
+			if obiutils.UnsafeStringFreomBytes(sequence.Sequence()) == obiutils.UnsafeStringFreomBytes(references[order].Sequence()) {
+				score = 0
+				alilength = sequence.Len()
+				lcs = alilength
+			}
+		case 1:
+			d, _, _, _ := obialign.D1Or0(sequence, references[order])
+			if d >= 0 {
+				score = d
+				alilength = max(sequence.Len(), ref.Len())
+				lcs = alilength - score
+			}
+		default:
+			lcs, alilength = obialign.FastLCSScore(sequence, references[order], maxe, &matrix)
+			if lcs >= 0 {
+				score = alilength - lcs
+			}
+		}
+
+		// log.Warnf("LCS : %d  ALILENGTH : %d score : %d cw : %d", lcs, alilength, score, cw[order])
+		if lcs >= 0 {
+
+			// sss = append(sss, cw[order], alilength-lcs)
+
+			//
+			// We have found a better candidate than never
+			//
+			if maxe == -1 || score < maxe {
+				bests = bests[:0]       // Empty the best lists
+				bestidxs = bestidxs[:0] //
+
+				maxe = score // Memorize the best scores
+				wordmin = max(0, max(sequence.Len(), ref.Len())-3-4*maxe)
+				bestId = float64(lcs) / float64(alilength)
+				bestmatch = ref.Id()
+				// log.Warnln(sequence.Id(), ref.Id(), cw[order], maxe, bestId, wordmin)
+			}
+
+			if score == maxe {
+				bests = append(bests, ref)
+				bestidxs = append(bestidxs, order)
+				id := float64(lcs) / float64(alilength)
+				if id > bestId {
+					bestId = id
+					bestmatch = ref.Id()
+				}
+				// log.Println(ref.Id(), maxe, bestId,bestidxs)
+			}
+
+		}
+
+	}
+	// sequence.SetAttribute("maxe", sss)
+	log.Debugln("Closest Match", sequence.Id(), maxe, bestId, references[bestidxs[0]].Id(), bestidxs, len(bests))
+	return bests, maxe, bestId, bestmatch, bestidxs
+}
+
+func (db *Obitag2RefDB) BestConsensus(bests obiseq.BioSequenceSlice, differences int, slot string) *obitax.TaxNode {
+	taxon := (*obitax.TaxNode)(nil)
+
+	for _, best := range bests {
+		idx := best.OBITagRefIndex(slot)
+		if idx == nil {
+			log.Fatalf("Reference database must be indexed first")
+		}
+
+		d := differences
+		identification, ok := idx[d]
+		found := false
+		var parts []string
+
+		/*
+			Here is an horrible hack for xprize challence.
+			With Euka01 the part[0] was equal to "" for at
+			least a sequence consensus. Which is not normal.
+
+			TO BE CHECKED AND CORRECTED
+
+			The problem seems related to idx that doesn't have
+			a 0 distance
+		*/
+		for !found && d >= 0 {
+			for !ok && d >= 0 {
+				identification, ok = idx[d]
+				d--
+			}
+
+			parts = strings.Split(identification, "@")
+
+			found = parts[0] != ""
+			if !found {
+				log.Debugln("Problem in identification line : ", best.Id(), "idx:", idx, "distance:", d)
+				for !ok && d <= 1000 {
+					identification, ok = idx[d]
+					d++
+				}
+
+			}
+		}
+
+		match_taxid, err := strconv.Atoi(parts[0])
+
+		if err != nil {
+			log.Panicln("Cannot extract taxid from :", identification)
+		}
+
+		match_taxon, err := db.Taxonomy.Taxon(match_taxid)
+
+		if err != nil {
+			log.Panicln("Cannot find taxon corresponding to taxid :", match_taxid)
+		}
+
+		if taxon != nil {
+			taxon, _ = taxon.LCA(match_taxon)
+		} else {
+			taxon = match_taxon
+		}
+
+	}
+
+	return taxon
+}
+
+// Identify makes the taxonomic identification of a BioSequence.
+//
+// Parameters:
+// - sequence: A pointer to a BioSequence to identify.
+// - references: A BioSequenceSlice.
+// - refcounts: A slice of pointers to Table4mer.
+// - taxa: A TaxonSet.
+// - taxo: A pointer to a Taxonomy.
+// - runExact: A boolean value indicating whether to run exact matching.
+//
+// Returns:
+// - A pointer to a BioSequence.
+func Identify(sequence *obiseq.BioSequence,
+	db *Obitag2RefDB,
+	runExact bool) *obiseq.BioSequence {
+
+	identity := 1.0
+	differences := 0
+	method := "exact match"
+	weight := 0
+
+	var bestmatch string
+	var taxon *obitax.TaxNode
+
+	exacttaxon, ok := (*db.ExactTaxid)[obiutils.UnsafeStringFreomBytes(sequence.Sequence())]
+	if ok {
+		taxon = exacttaxon.Taxon
+		bestmatch = exacttaxon.Id
+		weight = exacttaxon.Weight
+	} else {
+		var bests obiseq.BioSequenceSlice
+		bests, differences, identity, bestmatch, _ = FindClosests(sequence, *db.Clusters, *db.ClusterCounts, runExact)
+		weight = bests.Len() /* Should be the some of the count */
+		ftaxon := (*obitax.TaxNode)(nil)
+
+		if identity >= 0.5 && differences >= 0 {
+			ftaxon = db.BestConsensus(bests, differences, "obitag_ref_index")
+
+			fam := ftaxon.TaxonAtRank("family")
+
+			if fam != nil {
+				ftaxid := fam.Taxid()
+				bests, differences, identity, bestmatch, _ = FindClosests(
+					sequence,
+					*(*db.Families)[ftaxid],
+					*(*db.FamilyCounts)[ftaxid],
+					runExact,
+				)
+				sequence.SetAttribute("obitag_proposed_family", fam.ScientificName())
+				ftaxon = db.BestConsensus(bests, differences, "reffamidx_in")
+
+			}
+
+		} else {
+			// Cannot match any taxon
+			ftaxon, _ = db.Taxonomy.Taxon(1)
+			sequence.SetTaxid(1)
+		}
+
+		taxon = ftaxon
+		method = "lcsfamlily"
+	}
+
+	sequence.SetTaxid(taxon.Taxid())
+
+	sequence.SetAttribute("scientific_name", taxon.ScientificName())
+	sequence.SetAttribute("obitag_rank", taxon.Rank())
+	sequence.SetAttribute("obitag_bestid", identity)
+	sequence.SetAttribute("obitag_bestmatch", bestmatch)
+	sequence.SetAttribute("obitag_match_count", weight)
+	sequence.SetAttribute("obitag_similarity_method", method)
+
+	return sequence
+}
+
+func IdentifySeqWorker(db *Obitag2RefDB, runExact bool) obiseq.SeqWorker {
+	return func(sequence *obiseq.BioSequence) (obiseq.BioSequenceSlice, error) {
+		return obiseq.BioSequenceSlice{Identify(sequence, db, runExact)}, nil
+	}
+}
+
+func CLIAssignTaxonomy(iterator obiiter.IBioSequence,
+	references obiseq.BioSequenceSlice,
+	taxo *obitax.Taxonomy,
+) obiiter.IBioSequence {
+
+	refcounts := make(
+		[]*obikmer.Table4mer,
+		len(references))
+
+	taxa := make(obitax.TaxonSet,
+		len(references))
+
+	familydb := make(map[int]*obiseq.BioSequenceSlice)
+	familycounts := make(map[int]*[]*obikmer.Table4mer)
+	familytaxa := make(map[int]obitax.TaxonSet)
+	clusterdb := obiseq.MakeBioSequenceSlice()
+	clustercounts := make([]*obikmer.Table4mer, 0)
+	clustertaxa := make(obitax.TaxonSet, 0)
+	exactmatch := make(map[string]*obiseq.BioSequenceSlice)
+
+	buffer := make([]byte, 0, 1000)
+
+	j := 0
+	for i, seq := range references {
+		refcounts[i] = obikmer.Count4Mer(seq, &buffer, nil)
+		taxa[i], _ = taxo.Taxon(seq.Taxid())
+
+		if is_centrer, _ := seq.GetBoolAttribute("reffamidx_clusterhead"); is_centrer {
+			clusterdb = append(clusterdb, seq)
+			clustercounts = append(clustercounts, refcounts[i])
+			clustertaxa[j] = taxa[i]
+			j++
+		}
+
+		family, _ := seq.GetIntAttribute("family_taxid")
+
+		fs, ok := familydb[family]
+		if !ok {
+			fs = obiseq.NewBioSequenceSlice(0)
+			familydb[family] = fs
+		}
+
+		*fs = append(*fs, seq)
+
+		fc, ok := familycounts[family]
+
+		if !ok {
+			fci := make([]*obikmer.Table4mer, 0)
+			fc = &fci
+			familycounts[family] = fc
+		}
+
+		*fc = append(*fc, refcounts[i])
+
+		ft, ok := familytaxa[family]
+
+		if !ok {
+			ft = make(obitax.TaxonSet, 0)
+			familytaxa[family] = ft
+		}
+
+		ft[len(ft)] = taxa[i]
+
+		seqstr := obiutils.UnsafeStringFreomBytes(seq.Sequence())
+		em, ok := exactmatch[seqstr]
+
+		if !ok {
+			em = obiseq.NewBioSequenceSlice()
+			exactmatch[seqstr] = em
+		}
+
+		*em = append(*em, seq)
+
+	}
+
+	exacttaxid := make(map[string]*Obitag2Match, len(exactmatch))
+	for seqstr, seqs := range exactmatch {
+		var err error
+		t, _ := taxo.Taxon((*seqs)[0].Taxid())
+		w := (*seqs)[0].Count()
+		lseqs := seqs.Len()
+
+		for i := 1; i < lseqs; i++ {
+			t2, _ := taxo.Taxon((*seqs)[i].Taxid())
+			t, err = t.LCA(t2)
+
+			if err != nil {
+				log.Panic(err)
+			}
+
+			w += (*seqs)[i].Count()
+		}
+
+		exacttaxid[seqstr] = &Obitag2Match{
+			Taxon:  t,
+			Id:     (*seqs)[0].Id(),
+			Weight: w,
+		}
+	}
+
+	db := &Obitag2RefDB{
+		Taxonomy: taxo,
+
+		Full:       &references,
+		FullCounts: &refcounts,
+		FullTaxa:   &taxa,
+
+		Clusters:      &clusterdb,
+		ClusterCounts: &clustercounts,
+		ClusterTaxa:   &clustertaxa,
+
+		Families:     &familydb,
+		FamilyCounts: &familycounts,
+		FamilyTaxa:   &familytaxa,
+
+		ExactTaxid: &exacttaxid,
+	}
+
+	worker := IdentifySeqWorker(db, CLIRunExact())
+
+	return iterator.MakeIWorker(worker, false, obioptions.CLIParallelWorkers(), 0)
+}
diff --git a/pkg/obitools/obitag2/options.go b/pkg/obitools/obitag2/options.go
new file mode 100644
index 0000000..74bdc58
--- /dev/null
+++ b/pkg/obitools/obitag2/options.go
@@ -0,0 +1,120 @@
+package obitag2
+
+import (
+	log "github.com/sirupsen/logrus"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obifind"
+	"github.com/DavidGamba/go-getoptions"
+)
+
+var _RefDB = ""
+var _SaveRefDB = ""
+var _RunExact = false
+var _GeomSim = false
+
+func TagOptionSet(options *getoptions.GetOpt) {
+	options.StringVar(&_RefDB, "reference-db", _RefDB,
+		options.Alias("R"),
+		options.Required(),
+		options.ArgName("FILENAME"),
+		options.Description("The name of the file containing the reference DB"))
+
+	options.StringVar(&_SaveRefDB, "save-db", _SaveRefDB,
+		options.ArgName("FILENAME"),
+		options.Description("The name of a file where to save the reference DB with its indices"))
+
+	options.BoolVar(&_GeomSim, "geometric", _GeomSim,
+		options.Alias("G"),
+		options.Description("Activate the experimental geometric similarity heuristic"))
+
+	// options.BoolVar(&_RunExact, "exact", _RunExact,
+	// 	options.Alias("E"),
+	// 	options.Description("Desactivate the heuristic limitating the sequence comparisons"))
+
+}
+
+// OptionSet adds to the basic option set every options declared for
+// the obiuniq command
+func OptionSet(options *getoptions.GetOpt) {
+	obiconvert.OptionSet(options)
+	obifind.LoadTaxonomyOptionSet(options, true, false)
+	TagOptionSet(options)
+}
+
+func CLIRefDBName() string {
+	return _RefDB
+}
+
+func CLIRefDB() obiseq.BioSequenceSlice {
+	refdb, err := obiformats.ReadSequencesFromFile(_RefDB)
+
+	if err != nil {
+		log.Panicf("Cannot open the reference library file : %s\n", _RefDB)
+	}
+
+	return refdb.Load()
+}
+
+func CLIGeometricMode() bool {
+	return _GeomSim
+}
+
+func CLIShouldISaveRefDB() bool {
+	return _SaveRefDB != ""
+}
+
+func CLISaveRefetenceDB(db obiseq.BioSequenceSlice) {
+	if CLIShouldISaveRefDB() {
+		idb := obiiter.IBatchOver(db, 1000)
+
+		var newIter obiiter.IBioSequence
+
+		opts := make([]obiformats.WithOption, 0, 10)
+
+		switch obiconvert.CLIOutputFastHeaderFormat() {
+		case "json":
+			opts = append(opts, obiformats.OptionsFastSeqHeaderFormat(obiformats.FormatFastSeqJsonHeader))
+		case "obi":
+			opts = append(opts, obiformats.OptionsFastSeqHeaderFormat(obiformats.FormatFastSeqOBIHeader))
+		default:
+			opts = append(opts, obiformats.OptionsFastSeqHeaderFormat(obiformats.FormatFastSeqJsonHeader))
+		}
+
+		nworkers := obioptions.CLIParallelWorkers() / 4
+		if nworkers < 2 {
+			nworkers = 2
+		}
+
+		opts = append(opts, obiformats.OptionsParallelWorkers(nworkers))
+		opts = append(opts, obiformats.OptionsBatchSize(obioptions.CLIBatchSize()))
+
+		opts = append(opts, obiformats.OptionsCompressed(obiconvert.CLICompressed()))
+
+		var err error
+
+		switch obiconvert.CLIOutputFormat() {
+		case "fastq":
+			newIter, err = obiformats.WriteFastqToFile(idb, _SaveRefDB, opts...)
+		case "fasta":
+			newIter, err = obiformats.WriteFastaToFile(idb, _SaveRefDB, opts...)
+		default:
+			newIter, err = obiformats.WriteSequencesToFile(idb, _SaveRefDB, opts...)
+		}
+
+		if err != nil {
+			log.Fatalf("Write file error: %v", err)
+		}
+
+		newIter.Recycle()
+		obiiter.WaitForLastPipe()
+	}
+}
+
+func CLIRunExact() bool {
+	return _RunExact
+}
diff --git a/pkg/obiutils/counter.go b/pkg/obiutils/counter.go
new file mode 100644
index 0000000..b7e4a45
--- /dev/null
+++ b/pkg/obiutils/counter.go
@@ -0,0 +1,42 @@
+package obiutils
+
+import "sync"
+
+type Counter struct {
+	Inc   func() int
+	Dec   func() int
+	Value func() int
+}
+
+func NewCounter(initial ...int) *Counter {
+	value := 0
+	lock := sync.Mutex{}
+
+	if len(initial) > 0 {
+		value = initial[0]
+	}
+
+	c := Counter{
+		Inc: func() int {
+			lock.Lock()
+			defer lock.Unlock()
+			value++
+			return value
+		},
+
+		Dec: func() int {
+			lock.Lock()
+			defer lock.Unlock()
+			value--
+			return value
+		},
+
+		Value: func() int {
+			lock.Lock()
+			defer lock.Unlock()
+			return value
+		},
+	}
+
+	return &c
+}
diff --git a/pkg/obiutils/strings.go b/pkg/obiutils/strings.go
new file mode 100644
index 0000000..fc3d576
--- /dev/null
+++ b/pkg/obiutils/strings.go
@@ -0,0 +1,12 @@
+package obiutils
+
+import "unsafe"
+
+func UnsafeStringFreomBytes(data []byte) string {
+	if len(data) > 0 {
+		s := unsafe.String(unsafe.SliceData(data), len(data))
+		return s
+	}
+
+	return ""
+}