Lunix color test

#!/bin/sh

ESC=""
CMD='echo'
OPT='-n'
SUF=''
TMP=/tmp/xterm$$
eval '$CMD $OPT >$TMP || echo fail >$TMP' 2>/dev/null
( test ! -f $TMP || test -s $TMP ) &&
for verb in printf print ; do
    rm -f $TMP
    eval '$verb "\c" >$TMP || echo fail >$TMP' 2>/dev/null
    if test -f $TMP ; then
	if test ! -s $TMP ; then
	    CMD="$verb"
	    OPT=
	    SUF='\c'
	    break
	fi
    fi
done
rm -f $TMP

if ( trap "echo exit" EXIT 2>/dev/null ) >/dev/null
then
    trap '$CMD ""; exit' EXIT HUP INT TRAP TERM
else
    trap '$CMD ""; exit' 0    1   2   5    15
fi

echo ""
#while true
#do
    for AT in 0 1 4 7
    do
    	case $AT in
	0) attr="   ";;
	1) attr="BO ";;
	4) attr="UN ";;
	7) attr="RV ";;
	esac
	for FG in 0 1 2 3 4 5 6 7
	do
	    case $FG in
	    0) fcolor="BLK ";;
	    1) fcolor="RED ";;
	    2) fcolor="GRN ";;
	    3) fcolor="YEL ";;
	    4) fcolor="BLU ";;
	    5) fcolor="MAG ";;
	    6) fcolor="CYN ";;
	    7) fcolor="WHT ";;
	    esac
	    for HI in 3 9
	    do
	    	if test $HI = 3 ; then
		    color=" $fcolor"
		else
		    color="+$fcolor"
		fi
		$CMD $OPT "[0;${AT}m$attr$SUF"
		$CMD $OPT "[${HI}${FG}m$color$SUF"
		for BG in 1 2 3 4 5 6 7
		do
		    case $BG in
		    0) bcolor="BLK ";;
		    1) bcolor="RED ";;
		    2) bcolor="GRN ";;
		    3) bcolor="YEL ";;
		    4) bcolor="BLU ";;
		    5) bcolor="MAG ";;
		    6) bcolor="CYN ";;
		    7) bcolor="WHT ";;
		    esac
		    $CMD $OPT "[4${BG}m$bcolor$SUF"
		    $CMD $OPT "[10${BG}m+$bcolor$SUF"
		done
		echo ""
	    done
	done
	sleep 1
    done
#done