How can we Write a shell script that reads each line of a target file, then writes the line back to stout, but with an extra blank line following .This has the effect of double-spacing the file.

Include all necessary code to check wether the script gets the necessary command line argumaent ( file name) and wether the specified file exists.

When the script runs correctly, modify it to triple- space the target file.

Finally, write a script to remove all blank lines from the target file, single-spacing it.