Scritp for matrioska challenge (beta)

matrioska.sh

#!/bin/bash

workpath=$(pwd)
rm -r -f temp
echo $workpath

function goToWorkPath() {
    cd $workpath
}

function save() { 
     goToWorkPath
     mkdir copy
     cp $1 copy
     cd copy
     filenameAsHas=$(md5 -q $1) 
     mv $1 $filenameAsHas
}

function move_temp_dir() {
    goToWorkPath
    mkdir temp
    mv $1 temp
    cd temp
    mv * $2
} 

function prepare_for_restart() {
    mv * file.hack          
    mv file.hack ../
}

while :
do 
    let "var=var+1" 
    let "last=last+1"
    
    if [ $last -gt 100 ] 
    then 
        last=0
    fi
    

    find . -name "*.hack" -print | while read filename; do
    file $filename
    cd $workpath
    rm -r -f temp
    echo $var
    echo $filename
    

    if file $filename | grep  -q  "ASCII cpio archive (pre-SVR4 or odc)"; then 
        save $filename
        move_temp_dir $filename "file_cpio"
            cpio -i -F file_cpio
            rm file_cpio
        prepare_for_restart

        
    elif file $filename | grep  -q  "MAR archive data"; then 
        save $filename
        move_temp_dir $filename "mar.zip"
            open -W -j mar.zip
            rm mar.zip
        prepare_for_restart

    elif file $filename | grep  -q  "gzip"; then 
        save $filename
        move_temp_dir $filename "file.gz"
            gzip -d file.gz
            rm file.gz
        prepare_for_restart

    elif file $filename | grep  -q  "7-zip"; then 
        save $filename
        move_temp_dir $filename "file.zip"

        7z e "file.zip"
        rm "file.zip" 

        prepare_for_restart

    elif file $filename | grep  -q  "Zip archive"; then 
        save $filename
        move_temp_dir $filename "file.zip"

        unzip -j -d tmp "file.zip"; 
        rm "file.zip"
        cp tmp/* . && rm -R tmp
        prepare_for_restart

    elif file $filename | grep  -q  "bzip2"; then 
        save $filename
        move_temp_dir $filename "file.zip"

        bzip2 -d "file.zip"; 
        rm "file.zip"
        mv *.out file_$var.hack 
        prepare_for_restart
    elif file $filename | grep  -q  "DOS"; then 
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      echo "END"
      save $filename
      move_temp_dir $filename "file.zip"
    fi    
    done
done