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rc/sh/has

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#!/usr/bin/env sh
# compat: +ash +bash +dash +zsh
has() { ### @- [`have`,](#have) silently.
if [ -z "$ZSH_VERSION" ]; then which -- "$1"; else whence -p -- "$1"; fi
} >/dev/null 2>/dev/null
[ -n "${preload+-}" ] || has "$@"