#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH

has() { ### @- [`have`,](#have) silently.
    if [ -z "$ZSH_VERSION" ]; then which -- "$1"; else whence -p -- "$1"; fi
} >/dev/null 2>/dev/null

[ -n "${preload+-}" ] || has "$@"