1 #!/bin/sh

     2 

     3 HOME=/dev/null

     4 export HOME

     5 

     6 unset which

     7 

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

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

    10     WHICH=which

    11 elif [ -z "$WHICH" ]; then

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

    13 	WHICH=which

    14     else

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

    16 	    if [ -x $a/which ]; then

    17 		WHICH=$a/which

    18 		break;

    19 	    fi

    20 	done

    21     fi

    22 fi

    23 

    24 if [ -z "$WHICH" ]; then

    25     IFS=:

    26     for a in $PATH; do

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

    28 	    echo "$a/$1"

    29 	    exit 0

    30 	fi

    31     done

    32 else

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

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

    35 	echo "$a"

    36 	exit 0

    37     fi

    38 fi

    39 exit 1