diff --git a/shell/shell.sh b/shell/shell.sh
index 9e2b27e..82a1ed2 100644
--- a/shell/shell.sh
+++ b/shell/shell.sh
@@ -1,29 +1,30 @@
-[ "$(cat /proc/$$/comm)" = "bash" ] || return
+SH="$(cat /proc/$$/comm)"
 
-# completion
-
-file="/usr/share/bash-completion/bash_completion"
-
-if [ -f "${file}" ]; then
-	. "${file}"
-fi
-
-# history
-
-HISTCONTROL="ignorespace"
-
-HISTSIZE=-1
-
-HISTTIMEFORMAT="%Y%m%d %H%M%S "
+case "${SH}" in
+"bash")
+	# completion
+	file="/usr/share/bash-completion/bash_completion"
+	if [ -f "${file}" ]; then
+		. "${file}"
+	fi
+	# history
+	HISTCONTROL="ignorespace"
+	HISTSIZE=-1
+	HISTTIMEFORMAT="%Y%m%d %H%M%S "
+	;;
+*)
+	;;
+esac
 
 # prompt
 
 ps1() {
-	local date host
+	local date host id
 	local code="${1}"
 	date="$(date +%H:%M:%S)"
 	local git
 	host="$(hostname)"
+	id="$(id --user)"
 	local path="${PWD}"
 	local user="${USER}"
 	local view="└ "
@@ -33,7 +34,7 @@ ps1() {
 		view="${view}\e[0;32m"
 	fi
 	view="${view}${code}\e[0m @ \e[0;33m${date}\e[0m"
-	if [ "$(type -t __git_ps1)" == "function" ]; then
+	if [ "$(type -t __git_ps1)" = "function" ]; then
 		git="$(__git_ps1)"
 		if [ -n "${git}" ]; then
 			view="${view} –\e[0;35m${git}\e[0m"
@@ -41,7 +42,7 @@ ps1() {
 	fi
 	view="${view}\n\e[0;36m${path}\e[0m"
 	view="${view}\n┌ "
-	if [ ${EUID} -eq 0 ]; then
+	if [ "${id}" -eq 0 ]; then
 		view="${view}\e[0;31m"
 	else
 		view="${view}\e[0;32m"