UNIX systems programming Writing Perl Scripts

Convert a UNIX shell script (User Maintenance) into a Perl script. This Perl script must perform the following tasks:

• Generate a menu to ask the system administrator for the task that he or she would like to see performed.
• The available tasks are as follows:
  • Create a UNIX group.
  • Drop a UNIX group.
  • Create a user.
  • Drop a user.
• Prompt the user for the choice, and perform the system command.
• In addition, check to make sure that before creating either the user or the group that neither already exists; if it does already exist, print out the existing user ID, comment field, and home directory locations from the password file.

Include a discussion about what regular expressions are and how Perl efficiently includes regular expression processing in the language. Be sure to state examples.

This assignment must have in text citations and proper use of APA formating with two references as well as be completly original. Please be an expert in unix programming and Perl as i need someone who can actually write perl scripts not just commands.