#!/bin/sh

HOME=/dev/null

export HOME

unset which

WHICH=`which which 2>/dev/null`

if echo $WHICH | grep 'shell built-in command' >/dev/null 2>&1; then

    WHICH=which

elif [ -z "$WHICH" ]; then

    if which which >/dev/null 2>&1; then

	WHICH=which

    else

	for a in /usr/ucb /usr/bin /bin /usr/local/bin; do

	    if [ -x $a/which ]; then

		WHICH=$a/which

		break;

	    fi

	done

    fi

fi

if [ -z "$WHICH" ]; then

    IFS=:

    for a in $PATH; do

	if [ -x $a/$1 ]; then

	    echo "$a/$1"

	    exit 0

	fi

    done

else

    a=`"$WHICH" "$1" 2>/dev/null`

    if [ ! -z "$a" -a -x "$a" ]; then

	echo "$a"

	exit 0

    fi

fi

exit 1