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rc/sh/grop

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#!/usr/bin/env sh
# compat: +ash +bash +dash +zsh
# TODO: check for existence of grep -P; write a perl-based fallback.
grop() { ### @- invoke grep with `-oP`.
### **NOTE:** there also exists a grop(1) program provided by
### the *grop* package that i don't use.
argc $# -ge 1 grop || return
grep -oP -- "$@"
}
[ -n "${preload+-}" ] || . ~/sh/preload || exit 2
eval ${preload:-preload} argc
[ -n "${preload+-}" ] || grop "$@"