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40 lines
629 B
40 lines
629 B
#!/bin/sh
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HOME=/dev/null
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export HOME
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unset which
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WHICH=`which which 2>/dev/null`
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if echo $WHICH | grep 'shell built-in command' >/dev/null 2>&1; then
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WHICH=which
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elif [ -z "$WHICH" ]; then
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if which which >/dev/null 2>&1; then
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WHICH=which
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else
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for a in /usr/ucb /usr/bin /bin /usr/local/bin; do
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if [ -x $a/which ]; then
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WHICH=$a/which
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break;
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fi
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done
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fi
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fi
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if [ -z "$WHICH" ]; then
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IFS=:
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for a in $PATH; do
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if [ -x $a/$1 ]; then
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echo "$a/$1"
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exit 0
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fi
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done
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else
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a=`"$WHICH" "$1" 2>/dev/null`
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if [ ! -z "$a" -a -x "$a" ]; then
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echo "$a"
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exit 0
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fi
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fi
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exit 1
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