binary grep

bgrep.sh

#!/bin/bash

usage() {
cat <<EOT
Usage: ${0##*/} [-l] [-h] pattern [arg2] ...
	Prints lines containing a BRE pattern, after stripping binary data.
	Sort of like strings command followed by grep, only better.
	If no file paths are specified after the pattern, paths are
	read from stdin (tip: feed with find).
Options:
	-l only list file(s) that contains the pattern
	-h Display this message.
EOT
}

bgrep() {
	if ( env LC_ALL=en_US.US-ASCII LANG=en_US.US-ASCII tr -cs '[:print:]' '\n' < "$1" | \
		# delete blank lines
		sed '/^[[:blank:]]*$/d' | \
		# look for our pattern
		grep $LIST_OPTS $PATTERN ); then
		[ -z "$LIST_OPTS" ] && echo -ne "\tfound in: "
		echo "$1"
	fi
}

LIST_OPTS=''

# Parse the command-line options:
while getopts 'lh' option; do
	case "$option" in
		l) LIST_OPTS='-lq' ;; # list file(s) that contain pattern
		h) usage; exit 0 ;; # Help.
		?) usage; exit 0 ;; # illegal option: display usage
	esac
done
(( OPTIND-- ))
shift $OPTIND

if [ $# -gt 0 ]; then # process remaining args on the commandline
	PATTERN=$1
	shift

	if [ $# -gt 0 ]; then # process remaining args on the commandline
		while [ $# -gt 0 ]; do
			path=$1
			shift
			bgrep "$path"
		done
	else # read from stdin
		while read path; do
			bgrep "$path"
		done
	fi
else
	echo 'Please enter a pattern to search for.'
	usage
fi