diff --git a/sh/lint/shellcheck.sh b/sh/lint/shellcheck.sh
index 0cbe758..0253062 100644
--- a/sh/lint/shellcheck.sh
+++ b/sh/lint/shellcheck.sh
@@ -3,10 +3,12 @@ rwx_shellcheck() {
 	local file module modules path
 	file="$(mktemp)"
 	modules="$(rwx_find_shell "${root}")"
-	printf "%s\n" "${modules}" | while IFS= read -r module; do
+	while IFS= read -r module; do
 		path="${root}/${module}"
 		echo ". \"${path}\"" >>"${file}"
-	done
+	done <<EOF
+${modules}
+EOF
 	rwx_shellcheck_file "${file}"
 	rwx_remove "${file}"
 }
diff --git a/sh/main.sh b/sh/main.sh
index 8e76ad4..321d1dc 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -63,8 +63,6 @@ rwx_main() {
 # │ main │ cache │
 # ╰──────┴───────╯
 
-RWX_CODE=""
-
 # cache source code of a module
 rwx_cache() {
 	local root="${1}"
@@ -73,6 +71,7 @@ rwx_cache() {
 	local path="${root}/${module}"
 	local text
 	text="$(cat "${path}")"
+	# all source code
 	RWX_CODE="${RWX_CODE}\
 #↓ ${name}
 ${text}
diff --git a/sh/self.sh b/sh/self.sh
index dfbe203..4118d64 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -5,7 +5,7 @@ rwx_doc() {
 	local name="${1}"
 	[ -n "${name}" ] || return
 	local constant doc func line module
-	printf "%s\n" "${RWX_CODE}" | while IFS= read -r line; do
+	while IFS= read -r line; do
 		case "${line}" in
 			"#!"*) doc="" ;;
 			"#↓"*)
@@ -44,7 +44,9 @@ rwx_doc() {
 				fi
 				;;
 		esac
-	done
+	done <<EOF
+${RWX_CODE}
+EOF
 }
 
 # ╭──────┬───────╮
diff --git a/sh/tmux.sh b/sh/tmux.sh
index 1577751..1301204 100644
--- a/sh/tmux.sh
+++ b/sh/tmux.sh
@@ -25,13 +25,10 @@ rwx_tmux_server() {
 }
 rwx_tmux_servers() {
 	local active=\"\$(rwx_tmux_server)\"
-	local ifs=\"\${IFS}\"
 	local name path text
 	local paths=\"\$(lsof -U |
 		awk \"/^tmux:.*\\(LISTEN\\)\$/ {print \\\$9}\")\"
-	IFS=\"
-\"
-	for path in \${paths}; do
+	while IFS= read -r path; do
 		name=\"\$(basename \"\${path}\")\"
 		text=\"\${text}\\
 #[fg=default]\\
@@ -47,8 +44,9 @@ rwx_tmux_servers() {
 #[bg=##282828]\${name}\\
 #[bg=##181818] \\
 \"
-	done
-	IFS=\"\${ifs}\"
+	done <<EOF
+\${paths}
+EOF
 	echo \"\${text}\"
 }
 rwx_tmux_status() {