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rc/sh/has

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
has() { ### @-
### print the result of `which` if the program is found, else simply return 1.
###
### `export CC="$(has clang || has clang-3.8 || has gcc)"`
if [ -n "$ZSH_VERSION" ]; then
whence -p "$1"
else
which "$1" >/dev/null 2>&1 && which "$1"
fi
}
[ "${SOURCING:-0}" -gt 0 ] || has "$@"