bash to execute series of comands

do.sh

#!/bin/bash
shopt -s nocasematch

getFileExtension () {
    case "$1" in 
        "zip" )
            echo "zip"
        ;;
        "bzip2" )
            echo "bz2"
        ;;
        "xz" )
            echo "xz"
        ;;
        "gzip" )
            echo "gz"
        ;;

        "ascii" )
            echo "txt"
        ;;
    esac
}

processFile () {
    filename="if"
    case "$1" in
        InterestingFile*zip )
            fileType=`unzip -p -P Xy2jKjm92Bbp InterestingFile.zip | file -b - | cut -d ' ' -f 1`
            fileExtension=`getFileExtension ${fileType}`
            unzip -P Xy2jKjm92Bbp -p InterestingFile.zip > "${filename}.${fileExtension}"
            echo "${filename}.${fileExtension}"
        ;;

        if*zip )
            fileType=`unzip -p "${filename}.zip" | file -b - | cut -d ' ' -f 1`
            fileExtension=`getFileExtension ${fileType}`
            unzip -p "${filename}.zip" > "${filename}.${fileExtension}"
            echo "${filename}.${fileExtension}"
        ;;

        if*bz2 )
            fileType=`bzip2 -dc "${filename}.bz2" | file -b - | cut -d ' ' -f 1`
            fileExtension=`getFileExtension ${fileType}`
            bzip2 -cd "${filename}.bz2" > "${filename}.${fileExtension}"
            echo "${filename}.${fileExtension}"
        ;;

        if*gz )
            fileType=`gunzip -dc "${filename}.gz" | file -b - | cut -d ' ' -f 1`
            fileExtension=`getFileExtension ${fileType}`
            gunzip -cd "${filename}.gz" > "${filename}.${fileExtension}"
            echo "${filename}.${fileExtension}"
        ;;

        if*xz )
            fileType=`xz -dc "${filename}.xz" | file -b - | cut -d ' ' -f 1`
            fileExtension=`getFileExtension ${fileType}`
            xz -cd "${filename}.xz" > "${filename}.${fileExtension}"
            echo "${filename}.${fileExtension}"
        ;;

        if*txt )
	    password=`grep -P level1password.+ "${filename}.txt" | sed -E 's/.+\{(.+)\}/\1/'`
            echo "Password is ${password}"
        ;;
    esac
}


file="InterestingFile.zip"
while [[ "$file" != *"password"* ]]
do
    echo "Processing ${file}"
    file=`processFile $file`
#    echo $file
done
echo $file
exit 1