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#!/bin/sh # # Copyright (c) 2003 Thomas Klausner. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. grep=${GREP:-grep} zcat=${ZCAT:-zstdcat} endofopts=0 pattern_found=0 grep_args="" hyphen=0 silent=0 prog=${0##*/} # handle being called 'zegrep' or 'zfgrep' case $prog in *egrep*) prog=zegrep; grep_args='-E';; *fgrep*) prog=zfgrep; grep_args='-F';; *) prog=zstdgrep;; esac # skip all options and pass them on to grep taking care of options # with arguments, and if -e was supplied while [ "$#" -gt 0 ] && [ "${endofopts}" -eq 0 ]; do case "$1" in # from GNU grep-2.5.1 -- keep in sync! -[ABCDXdefm]) if [ "$#" -lt 2 ]; then printf '%s: missing argument for %s flag\n' "${prog}" "$1" >&2 exit 1 fi case "$1" in -e) pattern="$2" pattern_found=1 shift 2 break ;; -f) pattern_found=2 ;; *) ;; esac grep_args="${grep_args} $1 $2" shift 2 ;; --) shift endofopts=1 ;; -) hyphen=1 shift ;; -h) silent=1 shift ;; -*) grep_args="${grep_args} $1" shift ;; *) # pattern to grep for endofopts=1 ;; esac done # if no -e option was found, take next argument as grep-pattern if [ "${pattern_found}" -lt 1 ]; then if [ "$#" -ge 1 ]; then pattern="$1" shift elif [ "${hyphen}" -gt 0 ]; then pattern="-" else printf '%s: missing pattern\n' "${prog}" >&2 exit 1 fi fi EXIT_CODE=0 # call grep ... if [ "$#" -lt 1 ]; then # ... on stdin set -f # Disable file name generation (globbing). # shellcheck disable=SC2086 "${zcat}" - | "${grep}" ${grep_args} -- "${pattern}" - EXIT_CODE=$? set +f else # ... on all files given on the command line if [ "${silent}" -lt 1 ] && [ "$#" -gt 1 ]; then grep_args="-H ${grep_args}" fi set -f while [ "$#" -gt 0 ]; do # shellcheck disable=SC2086 if [ $pattern_found -eq 2 ]; then "${zcat}" -- "$1" | "${grep}" --label="${1}" ${grep_args} -- - else "${zcat}" -- "$1" | "${grep}" --label="${1}" ${grep_args} -- "${pattern}" - fi [ "$?" -ne 0 ] && EXIT_CODE=1 shift done set +f fi exit "${EXIT_CODE}"