Make colors.sh POSIX compliant

.scripts/colors.sh

@@ -1,27 +1,24 @@
-#!/bin/bash
-#
-#   This file echoes a bunch of color codes to the
-#   terminal to demonstrate what's available.  Each
-#   line is the color code of one forground color,
-#   out of 17 (default + 16 escapes), followed by a
-#   test use of that color on all nine background
-#   colors (default + 8 escapes).
-#
+#!/bin/sh
 
-T='gYw'   # The test text
+# This file echoes a bunch of color codes to the terminal to demonstrate what's
+# available. Each line is the color code of one forground color, out of 17
+# (default + 16 escapes), followed by a test use of that color on all nine
+# background colors (default + 8 escapes).
 
-echo -e "\n                 40m     41m     42m     43m\
-     44m     45m     46m     47m";
+# The test text
+text="gYw"
 
-for FGs in '    m' '   1m' '  30m' '1;30m' '  31m' '1;31m' '  32m' \
-           '1;32m' '  33m' '1;33m' '  34m' '1;34m' '  35m' '1;35m' \
-           '  36m' '1;36m' '  37m' '1;37m';
-  do FG=${FGs// /}
-  echo -en " $FGs \033[$FG  $T  "
-  for BG in 40m 41m 42m 43m 44m 45m 46m 47m;
-    do echo -en "$EINS \033[$FG\033[$BG  $T  \033[0m";
-  done
-  echo;
+printf "\n                 40m     41m     42m     43m\
+     44m     45m     46m     47m\n";
+
+for fgs in "    m" "   1m" "  30m" "1;30m" "  31m" "1;31m" "  32m" \
+           "1;32m" "  33m" "1;33m" "  34m" "1;34m" "  35m" "1;35m" \
+           "  36m" "1;36m" "  37m" "1;37m"; do
+	fg=$(echo "$fgs" | tr -d ' ')
+	printf " %s \033[%s  %s  " "$fgs" "$fg" "$text"
+	for bg in 40m 41m 42m 43m 44m 45m 46m 47m; do
+		printf " \033[%s\033[%s  %s  \033[0m" "$fg" "$bg" "$text";
+	done
+	echo
 done
 echo
-