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lzgrep
#!/bin/sh # xzgrep -- a wrapper around a grep program that decompresses files as needed # Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca> # Copyright (C) 1998, 2001, 2002, 2006, 2007 Free Software Foundation # Copyright (C) 1993 Jean-loup Gailly # Modified for XZ Utils by Andrew Dudman and Lasse Collin. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. #SET_PATH - This line is a placeholder to ease patching this script. # Instead of unsetting XZ_OPT, just make sure that xz will use file format # autodetection. This way memory usage limit and thread limit can be # specified via XZ_OPT. With gzip, bzip2, and lzop it's OK to just unset the # environment variables. xz='xz --format=auto' unset GZIP BZIP BZIP2 LZOP case ${0##*/} in *egrep*) prog=xzegrep; grep=${GREP:-grep -E};; *fgrep*) prog=xzfgrep; grep=${GREP:-grep -F};; *) prog=xzgrep; grep=${GREP:-grep};; esac version="$prog (XZ Utils) 5.4.5" usage="Usage: ${0##*/} [OPTION]... [-e] PATTERN [FILE]... Look for instances of PATTERN in the input FILEs, using their uncompressed contents if they are compressed. OPTIONs are the same as for '$grep'. Report bugs to <xz@tukaani.org>." # sed script to escape all ' for the shell, and then (to handle trailing # newlines correctly) turn trailing X on last line into '. escape=' s/'\''/'\''\\'\'''\''/g $s/X$/'\''/ ' operands= have_pat=0 files_with_matches=0 files_without_matches=0 no_filename=0 with_filename=0 # See if -H and --label options are supported (GNU and *BSDs). if test f:x = "$(eval "echo x | $grep -H --label=f x 2> /dev/null")"; then grep_supports_label=1 else grep_supports_label=0 fi while test $# -ne 0; do option=$1 shift optarg= case $option in (-[0123456789abcdEFGhHiIKlLnoPqrRsTuUvVwxyzZ]*[!0123456789]*) # Something like -Fiv was specified, that is, $option contains more # than one option of which the first option (in this example -F) # doesn't take an argument. Split the first option into a standalone # argument and continue parsing the rest of the options (in this example, # replace -Fiv with -iv in the argument list and set option=-F). # # If there are digits [0-9] they are treated as if they were a single # option character because this syntax is an alias for -C for GNU grep. # For example, "grep -25F" is equivalent to "grep -C25 -F". If only # digits are specified like "grep -25" we don't get here because the # above pattern in the case-statement doesn't match such strings. arg2=-\'$(LC_ALL=C expr "X${option}X" : 'X-.[0-9]*\(.*\)' | LC_ALL=C sed "$escape") eval "set -- $arg2 "'${1+"$@"}' option=$(LC_ALL=C expr "X$option" : 'X\(-.[0-9]*\)');; (--binary-*=* | --[lm]a*=* | --reg*=*) # These options require an argument and an argument has been provided # with the --foo=argument syntax. All is good. ;; (-[ABCDefmX] | --binary-* | --file | --[lm]a* | --reg*) # These options require an argument which should now be in $1. # If it isn't, display an error and exit. case ${1?"$option option requires an argument"} in (*\'*) optarg=" '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");; (*) optarg=" '$1'";; esac shift;; (--) break;; (-?*) ;; (*) case $option in (*\'*) operands="$operands '"$(printf '%sX\n' "$option" | LC_ALL=C sed "$escape");; (*) operands="$operands '$option'";; esac ${POSIXLY_CORRECT+break} continue;; esac case $option in (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*) printf >&2 '%s: %s: Option not supported\n' "$0" "$option" exit 2;; (-[ef]* | --file | --file=* | --reg*) have_pat=1;; (--h | --he | --hel | --help) printf '%s\n' "$usage" || exit 2 exit;; (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \ | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \ | --with-filename) with_filename=1 continue;; (-l | --files-with-*) files_with_matches=1 continue;; (-L | --files-witho*) files_without_matches=1 continue;; (-h | --no-f*) no_filename=1;; (-V | --v | --ve | --ver | --vers | --versi | --versio | --version) printf '%s\n' "$version" || exit 2 exit;; esac case $option in (*\'?*) option=\'$(printf '%sX\n' "$option" | LC_ALL=C sed "$escape");; (*) option="'$option'";; esac grep="$grep $option$optarg" done eval "set -- $operands "'${1+"$@"}' if test $have_pat -eq 0; then case ${1?"Missing pattern; try \`${0##*/} --help' for help"} in (*\'*) grep="$grep -e '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");; (*) grep="$grep -e '$1'";; esac shift fi if test $# -eq 0; then set -- - fi exec 3>&1 # res=1 means that no file matched yet res=1 for i; do case $i in *[-.][zZ] | *_z | *[-.]gz | *.t[ag]z) uncompress="gzip -cdf";; *[-.]bz2 | *[-.]tbz | *.tbz2) uncompress="bzip2 -cdf";; *[-.]lzo | *[-.]tzo) uncompress="lzop -cdf";; *[-.]zst | *[-.]tzst) uncompress="zstd -cdfq";; # zstd needs -q. *) uncompress="$xz -cdfqQ";; # -qQ to ignore warnings like unsupp. check. esac # xz_status will hold the decompressor's exit status. # Exit status of grep (and in rare cases, printf or sed) is # available as the exit status of this assignment command. xz_status=$( exec 5>&1 ($uncompress -- "$i" 5>&-; echo $? >&5) 3>&- | if test $files_with_matches -eq 1; then eval "$grep -q" && { printf '%s\n' "$i" || exit 2; } elif test $files_without_matches -eq 1; then eval "$grep -q" || { r=$? if test $r -eq 1; then printf '%s\n' "$i" || r=2 fi exit $r } elif test $with_filename -eq 0 && { test $# -eq 1 || test $no_filename -eq 1; }; then eval "$grep" elif test $grep_supports_label -eq 1; then # The grep implementation in use allows us to specify the filename # that grep will prefix to the output lines. This is faster and # less prone to security bugs than the fallback method that uses sed. # This also avoids confusing output with GNU grep >= 3.5 (2020-09-27) # which prints "binary file matches" to stderr instead of stdout. # # If reading from stdin, let grep use whatever name it prefers for # stdin. With GNU grep it is a locale-specific translated string. if test "x$i" = "x-"; then eval "$grep -H" else eval "$grep -H --label \"\$i\"" fi else # Append a colon so that the last character will never be a newline # which would otherwise get lost in shell command substitution. i="$i:" # Escape & \ | and newlines only if such characters are present # (speed optimization). case $i in (*' '* | *'&'* | *'\'* | *'|'*) # If sed fails, set i to a known safe string to ensure that # failing sed did not create a half-escaped dangerous string. i=$(printf '%s\n' "$i" | LC_ALL=C sed 's/[&\|]/\\&/g; $!s/$/\\/') || i='(unknown filename):';; esac # $i already ends with a colon so do not add it here. sed_script="s|^|$i|" # If grep or sed fails, pick the larger value of the two exit statuses. # If sed fails, use at least 2 since we use >= 2 to indicate errors. r=$( exec 4>&1 (eval "$grep" 4>&-; echo $? >&4) 3>&- | LC_ALL=C sed "$sed_script" >&3 4>&- ) || { sed_status=$? test "$sed_status" -lt 2 && sed_status=2 test "$r" -lt "$sed_status" && r=$sed_status } exit $r fi >&3 5>&- ) r=$? # If grep or sed or other non-decompression command failed with a signal, # exit immediately and ignore the possible remaining files. # # NOTE: Instead of 128 + signal_number, some shells use # 256 + signal_number (ksh) or 384 + signal_number (yash). # This is fine for us since their "exit" and "kill -l" commands take # this into account. (At least the versions I tried do but there is # a report of an old ksh variant whose "exit" truncates the exit status # to 8 bits without any special handling for values indicating a signal.) test "$r" -ge 128 && exit "$r" if test -z "$xz_status"; then # Something unusual happened, for example, we got a signal and # the exit status of the decompressor was never echoed and thus # $xz_status is empty. Exit immediately and ignore the possible # remaining files. exit 2 elif test "$xz_status" -ge 128; then # The decompressor died due to a signal. SIGPIPE is ignored since it can # occur if grep exits before the whole file has been decompressed (grep -q # can do that). If the decompressor died with some other signal, exit # immediately and ignore the possible remaining files. test "$(kill -l "$xz_status" 2> /dev/null)" != "PIPE" && exit "$xz_status" elif test "$xz_status" -gt 0; then # Decompression failed but we will continue with the remaining # files anwyway. Set exit status to at least 2 to indicate an error. test "$r" -lt 2 && r=2 fi # Since res=1 is the initial value, we only need to care about # matches (r == 0) and errors (r >= 2) here; r == 1 can be ignored. if test "$r" -ge 2; then # An error occurred in decompressor, grep, or some other command. Update # res unless a larger error code has been seen with an earlier file. test "$res" -lt "$r" && res=$r elif test "$r" -eq 0; then # grep found a match and no errors occurred. Update res if no errors have # occurred with earlier files. test "$res" -eq 1 && res=0 fi done # 0: At least one file matched and no errors occurred. # 1: No matches were found and no errors occurred. # >=2: Error. It's unknown if matches were found. exit "$res"
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