diff --git a/main.go b/main.go
index 4624e607..2c43b61f 100644
--- a/main.go
+++ b/main.go
@@ -31,6 +31,9 @@ var (
 	// pattern is search pattern.
 	pattern string
 
+	// filter is filter pattern.
+	filter string
+
 	// ver is version information.
 	ver bool
 	// helpKey is key bind information.
@@ -156,7 +159,9 @@ func RunOviewer(args []string) error {
 	if pattern != "" {
 		ov.Search(pattern)
 	}
-
+	if filter != "" {
+		ov.Filter(filter)
+	}
 	if err := ov.Run(); err != nil {
 		return err
 	}
@@ -331,7 +336,7 @@ func init() {
 	})
 
 	rootCmd.PersistentFlags().StringVarP(&pattern, "pattern", "", "", "search pattern")
-
+	rootCmd.PersistentFlags().StringVarP(&filter, "filter", "", "", "filter search pattern")
 	rootCmd.PersistentFlags().BoolVarP(&oviewer.SkipExtract, "skip-extract", "", false, "skip extracting compressed files")
 
 	// Config.General
diff --git a/oviewer/filter.go b/oviewer/filter.go
index 3f6d4cf1..a6ac4756 100644
--- a/oviewer/filter.go
+++ b/oviewer/filter.go
@@ -6,8 +6,78 @@ import (
 	"io"
 	"log"
 	"strings"
+
+	"github.com/gdamore/tcell/v2"
 )
 
+// eventInputFilter represents the filter input mode.
+type eventInputFilter struct {
+	tcell.EventTime
+	clist *candidate
+	value string
+}
+
+// setBackSearchMode sets the inputMode to Backsearch.
+func (root *Root) setSearchFilterMode() {
+	input := root.input
+	input.value = ""
+	input.cursorX = 0
+
+	if root.searcher != nil {
+		input.SearchCandidate.toLast(root.searcher.String())
+	}
+
+	input.Event = newSearchFilterEvent(input.SearchCandidate)
+}
+
+// newSearchFilterEvent returns FilterInput.
+func newSearchFilterEvent(clist *candidate) *eventInputFilter {
+	return &eventInputFilter{
+		value:     "",
+		clist:     clist,
+		EventTime: tcell.EventTime{},
+	}
+}
+
+// Mode returns InputMode.
+func (e *eventInputFilter) Mode() InputMode {
+	return Filter
+}
+
+// Prompt returns the prompt string in the input field.
+func (e *eventInputFilter) Prompt() string {
+	return "&"
+}
+
+// Confirm returns the event when the input is confirmed.
+func (e *eventInputFilter) Confirm(str string) tcell.Event {
+	e.value = str
+	e.clist.toLast(str)
+	e.SetEventNow()
+	return e
+}
+
+// Up returns strings when the up key is pressed during input.
+func (e *eventInputFilter) Up(str string) string {
+	e.clist.toAddLast(str)
+	return e.clist.up()
+}
+
+// Down returns strings when the down key is pressed during input.
+func (e *eventInputFilter) Down(str string) string {
+	e.clist.toAddTop(str)
+	return e.clist.down()
+}
+
+func (root *Root) Filter(str string) {
+	root.input.value = str
+	ev := &eventInputFilter{
+		value: str,
+	}
+	root.postEvent(ev)
+}
+
+// filter filters the document by the input value.
 func (root *Root) filter(ctx context.Context) {
 	searcher := root.setSearcher(root.input.value, root.Config.CaseSensitive)
 	if searcher == nil {
@@ -47,6 +117,7 @@ func (root *Root) filter(ctx context.Context) {
 	filterDoc.SkipLines = m.SkipLines
 
 	go m.searchWriter(ctx, searcher, filterDoc, m.firstLine())
+
 	root.setMessagef("filter:%v", word)
 }
 
@@ -57,6 +128,7 @@ func (m *Document) searchWriter(ctx context.Context, searcher Searcher, renderDo
 	for {
 		lineNum, err := m.searchLine(ctx, searcher, true, nextLN)
 		if err != nil {
+			log.Println(err)
 			break
 		}
 		line, err := m.Line(lineNum)
diff --git a/oviewer/input_search.go b/oviewer/input_search.go
index 09e65b39..076f6502 100644
--- a/oviewer/input_search.go
+++ b/oviewer/input_search.go
@@ -97,6 +97,7 @@ func newBackSearchEvent(clist *candidate) *eventInputBackSearch {
 	return &eventInputBackSearch{clist: clist}
 }
 
+// Mode returns InputMode.
 func (e *eventInputBackSearch) Mode() InputMode {
 	return Backsearch
 }
@@ -135,60 +136,3 @@ func (input *Input) searchCandidates(n int) []string {
 	start := max(0, listLen-n)
 	return input.SearchCandidate.list[start:listLen]
 }
-
-type eventInputFilter struct {
-	tcell.EventTime
-	clist *candidate
-	value string
-}
-
-// setBackSearchMode sets the inputMode to Backsearch.
-func (root *Root) setSearchFilterMode() {
-	input := root.input
-	input.value = ""
-	input.cursorX = 0
-
-	if root.searcher != nil {
-		input.SearchCandidate.toLast(root.searcher.String())
-	}
-
-	input.Event = newSearchFilterEvent(input.SearchCandidate)
-}
-
-func newSearchFilterEvent(clist *candidate) *eventInputFilter {
-	return &eventInputFilter{
-		value:     "",
-		clist:     clist,
-		EventTime: tcell.EventTime{},
-	}
-}
-
-// Mode returns InputMode.
-func (e *eventInputFilter) Mode() InputMode {
-	return Filter
-}
-
-// Prompt returns the prompt string in the input field.
-func (e *eventInputFilter) Prompt() string {
-	return "&"
-}
-
-// Confirm returns the event when the input is confirmed.
-func (e *eventInputFilter) Confirm(str string) tcell.Event {
-	e.value = str
-	e.clist.toLast(str)
-	e.SetEventNow()
-	return e
-}
-
-// Up returns strings when the up key is pressed during input.
-func (e *eventInputFilter) Up(str string) string {
-	e.clist.toAddLast(str)
-	return e.clist.up()
-}
-
-// Down returns strings when the down key is pressed during input.
-func (e *eventInputFilter) Down(str string) string {
-	e.clist.toAddTop(str)
-	return e.clist.down()
-}