Search for strings within of zip or jar archives

findstring.sh

#!/bin/bash

if ! command -v ugrep &> /dev/null; 
then
    echo "[-] Error: ugrep is not available, but required for this script."
    exit 1
fi

function usage()
{
    NAME=$(basename $0)

    echo "Usage: $NAME <filter> [path]"
    echo ""
    echo "Arguments:"
    echo "  filter          filter expression to search within the archived files"
    echo "  path            path to perform the search on"
    echo ""
    echo "Description:"
    echo "  $NAME can be used to find files within zip or jar files that contain a"
    echo "  specific string or pattern. It is basically like grep for zip or jar files."
    echo "  The actual work is done by ugrep. This script is just a wrapper for simpified usage."
    exit 0
}

while getopts "h" arg;
do
    case $arg in
        h)
            usage
            ;;
        *)
            usage
            ;;
    esac
done

if [[ $# -eq 0 ]];
then
    usage;
fi

FILTER=$1
S_PATH=$2

find "${S_PATH:=.}" -type f \( -name '*.jar' -or -name '*.zip' \) -print0 | while IFS= read -r -d '' FILE;
do
    ugrep -z "${FILTER:=''}" -I -- "${FILE}" /dev/null
done