Shell Programming and Scripting

#!/bin/bash
#set -x

cd /full/path/to/zipped_files

gunzip -c archive.tar.gz | tar -xvf -   &


# Instead of an infinite loop, you can use your condition to break out of the loop, say a count of files, a certain disk size is reached,...
# while [ condition ] ; do ...

while :
 do
 find . -name '*.extension' | while read FILE      2>/dev/null
  do
        temp=`lsof "$FILE" | awk 'NR>1 && $4 ~ "w"{ print $4 }'` ;
        
        if [ "$temp" = "" ]; then
                #Implies that the file is not in use
                #Initiate gzip on file
                gzip "$FILE";
        fi
    
        
  done > output
        
 # Wait for 2 minutes.
 sleep 120
 
 # If you use an infinite loop, then test when condition becomes true, break out of the loop.
 if [ condition ]     
  then 
      break
  fi

done