.profile: Change $ color depending on current shell

.profile

@@ -85,6 +85,8 @@ _ps1() {
 	fg_blue="\e[34m"
 	fg_red="\e[31m"
 	fg_green="\e[32m"
+	fg_yellow="\e[33m"
+	fg_grey="\e[37m"
 	fg_bold="\e[1m"
 
 	hostname_prefix="${fg_blue}"
@@ -93,6 +95,22 @@ _ps1() {
 		# Also add the machine's hostname
 		hostname_prefix="${fg_bold}${fg_red}`hostname`${r}${fg_red}:"
 	fi
+	# Change $ color depending on shell
+	cashcolor="${fg_green}"
+	case $0 in
+		bash)
+			cashcolor="${fg_blue}"
+			;;
+		ksh)
+			cashcolor="${fg_yellow}"
+			;;
+		sh)
+			cashcolor="${fg_grey}"
+			;;
+		*)
+			cashcolor="${fg_green}"
+			;;
+	esac
 	# Show the tilde instead of $HOME
 	cpwd="${PWD/#$HOME/\~}"
 	# Alert us if the last command failed
@@ -100,7 +118,7 @@ _ps1() {
 	if ! [ "$exitcode" = "0" ]; then
 		fail="${fg_bold}${fg_red}?"
 	fi
-	printf "[${hostname_prefix}${cpwd}${r}]${fail}${r}${fg_green}\$${r} "
+	printf "[${hostname_prefix}${cpwd}${r}]${fail}${r}${cashcolor}\$${r} "
 }
 
 if ! [ "$ZSH_NAME" ]; then