diff --git a/cmd/zenity/main.go b/cmd/zenity/main.go
index 2faabb0..b2ecb62 100644
--- a/cmd/zenity/main.go
+++ b/cmd/zenity/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"flag"
 	"image/color"
@@ -443,8 +444,8 @@ func ingestPath(path string) string {
 		if args != nil {
 			args = append(args, path)
 			out, err := exec.Command(args[0], args[1:]...).Output()
-			if len(out) > 0 && err == nil {
-				path = string(out[:len(out)-1])
+			if err == nil {
+				path = string(bytes.TrimSuffix(out, []byte{'\n'}))
 			}
 		}
 	}
@@ -464,8 +465,8 @@ func egestPath(path string, err error) (string, error) {
 			var out []byte
 			args = append(args, filepath.ToSlash(path))
 			out, err = exec.Command(args[0], args[1:]...).Output()
-			if len(out) > 0 && err == nil {
-				path = string(out[:len(out)-1])
+			if err == nil {
+				path = string(bytes.TrimSuffix(out, []byte{'\n'}))
 			}
 		}
 	}
diff --git a/color_unix.go b/color_unix.go
index 1df04e4..83614d9 100644
--- a/color_unix.go
+++ b/color_unix.go
@@ -23,7 +23,7 @@ func selectColor(opts options) (color.Color, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
-	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
+	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return nil, nil
 	}
 	if err != nil {
diff --git a/entry_darwin.go b/entry_darwin.go
index d296f56..c1786e3 100644
--- a/entry_darwin.go
+++ b/entry_darwin.go
@@ -1,6 +1,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 
 	"github.com/ncruces/zenity/internal/zenutil"
@@ -44,9 +45,10 @@ func entry(text string, opts options) (string, bool, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, "dialog", data)
+	out = bytes.TrimSuffix(out, []byte{'\n'})
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
-		if len(out) > 0 && opts.extraButton != nil &&
-			string(out[:len(out)-1]) == *opts.extraButton {
+		if opts.extraButton != nil &&
+			*opts.extraButton == string(out) {
 			return "", false, ErrExtraButton
 		}
 		return "", false, nil
@@ -54,7 +56,7 @@ func entry(text string, opts options) (string, bool, error) {
 	if err != nil {
 		return "", false, err
 	}
-	return string(out[:len(out)-1]), true, nil
+	return string(out), true, nil
 }
 
 func password(opts options) (string, string, bool, error) {
diff --git a/entry_unix.go b/entry_unix.go
index 35c024d..d6361ed 100644
--- a/entry_unix.go
+++ b/entry_unix.go
@@ -3,6 +3,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -45,9 +46,10 @@ func entry(text string, opts options) (string, bool, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
+	out = bytes.TrimSuffix(out, []byte{'\n'})
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
-		if len(out) > 0 && opts.extraButton != nil &&
-			string(out[:len(out)-1]) == *opts.extraButton {
+		if opts.extraButton != nil &&
+			*opts.extraButton == string(out) {
 			return "", false, ErrExtraButton
 		}
 		return "", false, nil
@@ -55,7 +57,7 @@ func entry(text string, opts options) (string, bool, error) {
 	if err != nil {
 		return "", false, err
 	}
-	return string(out[:len(out)-1]), true, nil
+	return string(out), true, nil
 }
 
 func password(opts options) (string, string, bool, error) {
@@ -77,9 +79,10 @@ func password(opts options) (string, string, bool, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
+	out = bytes.TrimSuffix(out, []byte{'\n'})
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
-		if len(out) > 0 && opts.extraButton != nil &&
-			string(out[:len(out)-1]) == *opts.extraButton {
+		if opts.extraButton != nil &&
+			*opts.extraButton == string(out) {
 			return "", "", false, ErrExtraButton
 		}
 		return "", "", false, nil
@@ -88,9 +91,9 @@ func password(opts options) (string, string, bool, error) {
 		return "", "", false, err
 	}
 	if opts.username {
-		if split := strings.SplitN(string(out[:len(out)-1]), "|", 2); len(split) == 2 {
+		if split := strings.SplitN(string(out), "|", 2); len(split) == 2 {
 			return split[0], split[1], true, nil
 		}
 	}
-	return "", string(out[:len(out)-1]), true, nil
+	return "", string(out), true, nil
 }
diff --git a/file_darwin.go b/file_darwin.go
index 7e1b92c..275d234 100644
--- a/file_darwin.go
+++ b/file_darwin.go
@@ -1,6 +1,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 	"strings"
 
@@ -27,10 +28,7 @@ func selectFile(opts options) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
-	}
-	return string(out), nil
+	return string(bytes.TrimSuffix(out, []byte{'\n'})), nil
 }
 
 func selectFileMutiple(opts options) ([]string, error) {
@@ -55,9 +53,7 @@ func selectFileMutiple(opts options) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
-	}
+	out = bytes.TrimSuffix(out, []byte{'\n'})
 	if len(out) == 0 {
 		return nil, nil
 	}
@@ -83,10 +79,7 @@ func selectFileSave(opts options) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
-	}
-	return string(out), nil
+	return string(bytes.TrimSuffix(out, []byte{'\n'})), nil
 }
 
 func initFilters(filters []FileFilter) []string {
diff --git a/file_unix.go b/file_unix.go
index 0f81127..a9be018 100644
--- a/file_unix.go
+++ b/file_unix.go
@@ -3,6 +3,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 	"strings"
 
@@ -23,16 +24,13 @@ func selectFile(opts options) (string, error) {
 	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(opts.ctx, args)
-	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
+	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return "", nil
 	}
 	if err != nil {
 		return "", err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
-	}
-	return string(out), nil
+	return string(bytes.TrimSuffix(out, []byte{'\n'})), nil
 }
 
 func selectFileMutiple(opts options) ([]string, error) {
@@ -49,14 +47,15 @@ func selectFileMutiple(opts options) ([]string, error) {
 	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(opts.ctx, args)
-	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
+	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return nil, nil
 	}
 	if err != nil {
 		return nil, err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
+	out = bytes.TrimSuffix(out, []byte{'\n'})
+	if len(out) == 0 {
+		return nil, nil
 	}
 	return strings.Split(string(out), zenutil.Separator), nil
 }
@@ -78,16 +77,13 @@ func selectFileSave(opts options) (string, error) {
 	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(opts.ctx, args)
-	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
+	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return "", nil
 	}
 	if err != nil {
 		return "", err
 	}
-	if len(out) > 0 {
-		out = out[:len(out)-1]
-	}
-	return string(out), nil
+	return string(bytes.TrimSuffix(out, []byte{'\n'})), nil
 }
 
 func initFilters(filters []FileFilter) []string {
diff --git a/internal/zenutil/color.go b/internal/zenutil/color.go
index 366de9f..f2a0b2e 100644
--- a/internal/zenutil/color.go
+++ b/internal/zenutil/color.go
@@ -29,12 +29,12 @@ func ParseColor(s string) color.Color {
 
 	if len(s) >= 10 {
 		c := color.NRGBA{A: 0xff}
-		if _, err := fmt.Sscanf(s, "rgb(%d,%d,%d)\n", &c.R, &c.G, &c.B); err == nil {
+		if _, err := fmt.Sscanf(s, "rgb(%d,%d,%d)", &c.R, &c.G, &c.B); err == nil {
 			return c
 		}
 
 		var a float32
-		if _, err := fmt.Sscanf(s, "rgba(%d,%d,%d,%f)\n", &c.R, &c.G, &c.B, &a); err == nil {
+		if _, err := fmt.Sscanf(s, "rgba(%d,%d,%d,%f)", &c.R, &c.G, &c.B, &a); err == nil {
 			c.A = uint8(255*a + 0.5)
 			return c
 		}
diff --git a/msg_darwin.go b/msg_darwin.go
index 47da5e6..3c40d0a 100644
--- a/msg_darwin.go
+++ b/msg_darwin.go
@@ -1,6 +1,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 
 	"github.com/ncruces/zenity/internal/zenutil"
@@ -101,8 +102,8 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 
 	out, err := zenutil.Run(opts.ctx, "dialog", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
-		if len(out) > 0 && opts.extraButton != nil &&
-			string(out[:len(out)-1]) == *opts.extraButton {
+		if opts.extraButton != nil &&
+			*opts.extraButton == string(bytes.TrimSuffix(out, []byte{'\n'})) {
 			return false, ErrExtraButton
 		}
 		return false, nil
diff --git a/msg_unix.go b/msg_unix.go
index 2ded76c..85249d0 100644
--- a/msg_unix.go
+++ b/msg_unix.go
@@ -3,6 +3,7 @@
 package zenity
 
 import (
+	"bytes"
 	"os/exec"
 	"strconv"
 
@@ -65,8 +66,8 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 
 	out, err := zenutil.Run(opts.ctx, args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
-		if len(out) > 0 && opts.extraButton != nil &&
-			string(out[:len(out)-1]) == *opts.extraButton {
+		if opts.extraButton != nil &&
+			*opts.extraButton == string(bytes.TrimSuffix(out, []byte{'\n'})) {
 			return false, ErrExtraButton
 		}
 		return false, nil