diff --git a/one-cmds/help b/one-cmds/help
index df2aa9c..6e15a5c 100755
--- a/one-cmds/help
+++ b/one-cmds/help
@@ -53,15 +53,15 @@ print_help() {
   local file="$ONE_DIR/one-cmds/$cmd"
   local label arg
 
-  if [[ ! -x "$file" ]]; then
-    printf '%s: Not found sub-command "%s". No executable file: %s\n' 'one.bash' "$cmd" "$file" >&2
+  if [[ ! -x "${file}" ]]; then
+    printf '%bNot found command "%s".%b\n' "$YELLOW" "$cmd" "$RESET_ALL" >&2
     return "$ONE_EX_USAGE"
   fi
 
   label=$( grep -i '^# one.bash:usage' "$file" 2>/dev/null || true )
 
   if [[ -z "$label" ]]; then
-    echo "The command '$cmd' has not usage document." >&2
+    printf '%bThe command "%s" has not usage document.%b\n' "$YELLOW" "$cmd" "$RESET_ALL" >&2
     return "$ONE_EX_UNAVAILABLE"
   fi
 
diff --git a/one-cmds/help-sub b/one-cmds/help-sub
index 2c92ed0..40b8c4d 100755
--- a/one-cmds/help-sub
+++ b/one-cmds/help-sub
@@ -45,6 +45,9 @@ fi
 # shellcheck source=../deps/colors.bash
 . "$ONE_DIR/deps/colors.bash"
 
+# shellcheck source=../bash/exit-codes.bash
+. "$ONE_DIR/bash/exit-codes.bash"
+
 colorful() {
   local line
   while IFS=$'\n' read -r line; do
@@ -68,21 +71,21 @@ print_help() {
     fi
   done
 
-  if [[ ! -f ${file:-} ]]; then
-    printf '%s: Not found ONE_SUB command "%s".\n' 'one.bash' "$cmd" >&2
-    return 2
+  if [[ -z ${file:-} ]]; then
+    printf '%bNot found ONE_SUB command "%s".%b\n'  "$YELLOW" "$cmd" "$RESET_ALL" >&2
+    return "$ONE_EX_USAGE"
   fi
 
   if [[ ! -x "${file}" ]]; then
-    printf '%s: Not found ONE_SUB command "%s". No executable file: %s\n' 'one.bash' "$cmd" "$file" >&2
-    return 1
+    printf '%bNot found ONE_SUB command "%s". File is not executable or not existed: %s%b\n' "$YELLOW" "$cmd" "$file" "$RESET_ALL" >&2
+    return "$ONE_EX_USAGE"
   fi
 
   label=$( grep -i '^# one.bash:usage' "$file" 2>/dev/null || true )
 
   if [[ -z "$label" ]]; then
-    echo "The command '$cmd' has not usage document." >&2
-    return 0
+    printf '%bThe command "%s" has not usage document.%b\n' "$YELLOW" "$cmd" "$RESET_ALL" >&2
+    return "$ONE_EX_UNAVAILABLE"
   fi
 
   arg=$( sed -E 's/^# one.bash:usage(:?.*)/\1/i' <<<"$label" || true )