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Message: <blockquote data-quote="nadman123" data-source="post: 1798450" data-attributes="member: 86564">Please help me to write this scriptwrite a UNIX shell script (Bourne shell syntax) calledadmin_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 allowsusers to perform one of the following tasks and then exit. Ifincorrect options are provided, an error message is echoed to standardoutput followed by the usage line above and an appropriate exit valueshould be returned to the shell. Any combination of the options can beprovided by the user and the options do not have to be provided in theorder given in the usage message.-l nDisplay the last n lines of the /etc/passwd file-f nDisplay the first n lines of the /etc/passwd file-s usernameDisplay the full path name of the login shell used by username-d usernameFor 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 yyyymmPerform 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.-cReturn a count of all users registered on the system (not just thoseusers logged on) whose UID is greater than 500-hSend information to standard output regarding the author (includingstudent-id number) of the program and the date it was written</blockquote>

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