UnixWrite a shell script (to run on the Bourne shell) that takes a filename as argument and then compresses and decompresses the file witheach of the following programs: bzip2 gzip zip For each of thecompressing programs the script notes the size of the file beforeand after compression. Then the script displays a table showingthe compression program uncompressed size and compressed size.Before using a compressing program to manipulate the file yourscript must verify that the file actually exists under the currentdirectory and is readable. You would probably need to research theUNIX command named set. Your script for this task must be namedcompr.sh. Make sure your script is user-friendly and follows commonsense