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

has() {
    if [ -n "$ZSH_VERSION" ]; then
        whence -p "$1"
    else
        which "$1" >/dev/null 2>&1 && which "$1"
    fi
}

[ "${SOURCING:-0}" -gt 0 ] || has "$@"