diff --git a/pkg/util/io/file.go b/pkg/util/io/file.go
index f9cc26a5..c7845755 100644
--- a/pkg/util/io/file.go
+++ b/pkg/util/io/file.go
@@ -69,23 +69,3 @@ func RenamePath(oldPath, newPath string) error {
 
 	return nil
 }
-
-// IsBinary returns true if a zero byte occurs within the first
-// 8000 bytes (or the entire length if shorter). This is the
-// same approach that git uses to determine if a file is binary.
-func IsBinary(bytes []byte) bool {
-	const firstFewBytes = 8000
-
-	length := len(bytes)
-	if firstFewBytes < length {
-		length = firstFewBytes
-	}
-
-	for i := 0; i < length; i++ {
-		if bytes[i] == 0 {
-			return true
-		}
-	}
-
-	return false
-}
diff --git a/pkg/util/io/io.go b/pkg/util/io/io.go
deleted file mode 100644
index 224c919d..00000000
--- a/pkg/util/io/io.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package io
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"io"
-	"os"
-)
-
-// Read stdin content as string
-func ReadStdinInput() (string, error) {
-	// validate
-	info, err := os.Stdin.Stat()
-	if err != nil {
-		return "", err
-	}
-	if info.Mode()&os.ModeCharDevice != 0 {
-		return "", fmt.Errorf("no data read from stdin")
-	}
-
-	// read content from stdin until EOF is encountered
-	input := bufio.NewReader(os.Stdin)
-	output := bytes.NewBuffer([]byte{})
-
-	for {
-		b, err := input.ReadByte()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return "", err
-		}
-		output.WriteByte(b)
-	}
-	return output.String(), nil
-}
diff --git a/pkg/util/io/io_test.go b/pkg/util/io/io_test.go
deleted file mode 100644
index 068d848d..00000000
--- a/pkg/util/io/io_test.go
+++ /dev/null
@@ -1,54 +0,0 @@
-package io
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-	"os"
-	"testing"
-	"time"
-
-	"github.com/bytedance/mockey"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestReadStdinInput(t *testing.T) {
-	mockey.PatchConvey("test read stdin input", t, func() {
-		mockey.Mock((*os.File).Stat).To(func(file *os.File) (os.FileInfo, error) {
-			return mockInfo{}, nil
-		}).Build()
-		input := "hello world!"
-		mockey.Mock(bufio.NewReader).To(func(rd io.Reader) *bufio.Reader {
-			return bufio.NewReaderSize(bytes.NewReader([]byte(input)), 4096)
-		}).Build()
-		result, err := ReadStdinInput()
-		assert.Equal(t, input, result)
-		assert.Nil(t, err)
-	})
-}
-
-type mockInfo struct{}
-
-func (m mockInfo) Name() string {
-	return ""
-}
-
-func (m mockInfo) Size() int64 {
-	return 4096
-}
-
-func (m mockInfo) Mode() os.FileMode {
-	return os.FileMode(0o777)
-}
-
-func (m mockInfo) IsDir() bool {
-	return false
-}
-
-func (m mockInfo) Sys() interface{} {
-	return nil
-}
-
-func (m mockInfo) ModTime() time.Time {
-	return time.Time{}
-}