Find filenames within of zip or jar archives

findfile.sh

#!/bin/bash

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

    echo "Usage: $NAME [filter] [path]"
    echo ""
    echo "Arguments:"
    echo "  filter          regex filter that is applied to archive contents"
    echo "  path            path there the search is performed on"
    echo ""
    echo "Description:"
    echo "  $NAME can be used to find files within of zip or jar archives. By default, it searches"
    echo "  the current path with no filtering regarding the zip or jar contents. When specifying"
    echo "  a filter, only files matching the filter are shown. Additionally, you can specify a"
    echo "  path to a location where zip or jar files should be serarched."

    exit 0
}

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

FILTER=$1
S_PATH=$2

find "${S_PATH:=.}" -type f \( -name '*.jar' -or -name '*.zip' \) -print0 | while IFS= read -r -d '' FILE; do

    UNZIP=$(unzip -l "$FILE")
    MATCH=$(echo "$UNZIP" | tail -n +2 | grep -i "$FILTER")

    if [[ $? -eq 0 ]]; then
        echo -e "\n==========================================================="
        echo "$UNZIP" | head -n 2
        echo "$MATCH" | grep -i "$FILTER"
        echo ""
    fi
done