recursiveunzip.sh

#!/bin/bash

# This script is public domain. You may use this for any purpose.
#
# By using this script, you acknowledge that the author is not liable
# for any damages or lost data.

# recursiveunzip
# 0.0.1
#
# Unzips a zip file containing other zip files into a directory
# structure, with optional deletion of the interior zip files.

IllegalArgs=1
FileNotFound=2
CannotCreateFolder=3

main()
{
    fileName=$(basename -s .zip "$1")
    mkdir $fileName 2> /dev/null
    folderCreationFailure=$?
    if [ $folderCreationFailure != 0 ]; then
        # there's already a folder with this name, or you don't have
        # write permissions. For the sake of safety, we exit.
        echo "Can't create the folder $fileName in $(pwd)"
        exit $CannotCreateFolder
    fi
    unzip -d "$fileName" "$fileName".zip
    cd "$fileName"

    oldIFS="$IFS"; IFS=$'\n'
    zipFiles=( $(ls *.zip 2> /dev/null) ); IFS="$oldIFS"
    if [ $zipFiles ]; then
        for file in "$zipFiles"; do
            main "$file"
        done
    fi
}

# User interface starts here.

if [ $# != 1 ]; then
    echo "Please pass in a single valid zip file."
    exit $IllegalArgs
fi

if [ ! -r $1 ]; then
    echo "You don't have read permissions for the file $1, or it doesn't exist."
    exit $FileNotFound
fi

isZip=$(file "$1" | grep -e "Zip archive data" -c)
    # This uses the `file` utility to make sure it is a zip file. `grep`
    # counts the matches and then we put this value in the status
    # variable.

if [ ! $isZip ]; then    # the file is not a zip file
    echo "You must pass in a .zip file."
    exit $IllegalArgs
else
    fileNameOriginal=$(basename -s .zip "$1")
    oldpwd="$(pwd)"

    main "$1"

    cd "$oldpwd"
    prompt="Would you like to remove all zip files inside $fileNameOriginal? [yes/no]  "
    tree "$fileNameOriginal"

    while [ ! $answer ]; do
        read -p "$prompt" answer
        if [ "$answer" != "yes" ] &&  [ "$answer" != "no" ]; then
            unset answer
        fi
    done

    if [ "$answer" == "yes" ]; then
        find "$fileNameOriginal" -type 'f' -name '*.zip' -delete
    fi

    tree "$fileNameOriginal"

    exit 0
fi