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rc/sh/have

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#!/usr/bin/env sh
# compat: +ash +bash +dash +zsh
have() { ### @- print the result of `which` if the program is found, else simply return 1.
### ```
### export SOLVER="$(have kissat || have picosat || have cadical || have minisat)"
### ```
if [ -z "$ZSH_VERSION" ]; then which -- "$1"; else whence -p -- "$1"; fi
} 2>/dev/null
[ -n "${preload+-}" ] || have "$@"