Shell Programming and Scripting

UNIX shell script (Bourne shell syntax) called
admin_script. This script is described below as a usage summary:
admin_script [ -l n ] [ -f n ] [ -s username ] [ -d username ]
[ -b username yyyymm ] [ -c ]
Note: if no options are specified, a menu is displayed which allows
users to perform one of the following tasks and then exit. If
incorrect options are provided, an error message is echoed to standard
output followed by the usage line above and an appropriate exit value
should be returned to the shell. Any combination of the options can be
provided by the user and the options do not have to be provided in the
order given in the usage message.
-l n
Display the last n lines of the /etc/passwd file
-f n
Display the first n lines of the /etc/passwd file
-s username
Display the full path name of the login shell used by username
-d username
For the home directory of username, display an English language string
which shows the permissions of the user's home directory.
For example, suppose the home directory of cwilson has the following
permission string:
drwxr-xr-- ... /home/cwilson
In this case the output from the script would be:
User cwilson's home directory has the following permissions set:
Read,Write and Execute for the user.
Read and Execute for the group.
Read only for others.
-b username yyyymm
Perform a backup of the files in home directory of username. However,
when using this option we only want to backup files which have been
modified during the month specified in the option. The month is
specified as a four digit year followed by a two digit month (e.g.
200804 refers to April 2008). The files should be backed up to a
directory called .backup in the home directory of username. If this
directory does not exist when the script is run, it must be created by
the script.
-c
Return a count of all users registered on the system (not just those
users logged on) whose UID is greater than 500
-h
Send information to standard output regarding the author (including
student-id number) of the program and the date it was written

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