Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:

Write a shell script to send a customized mail message to the users listed on the command line by login (user) name, only if they are currently logged on. If no users are listed on the command line an error message should be printed. In the mail message, you should use the full (real) name from the passwd file (/etc/passwd). You also need to sign the script with the real name of the person who is running the script. This can be derived from the $USER environment variable and looking up the value in the password file.
An error message should be printed if the user does not exist in the passwd file.

PLEASE ONLY SEND THIS MESSAGE TO USERS WHICH YOU KNOW PERSONALLY.

You can always use yourself and me as a test case.
The real name of the user of the script should only be computed once.
A "Here-Document (In-Line Redirection)" should be used for the mail message. No temporary files should be used.
The message should be as follows:
Hello "INSERT THE USERS REAL NAME FROM THE PASSWORD FILE",
Please ignore this mail. My instructor requires that I send this message as part of an assignment. The current time and date is . Have a nice day.
"insert the real name of the person running the script - do not hard code the value"


2. Relevant commands, code, scripts, algorithms:
sed, if-loop, ./user


3. The attempts at a solution (include all code and scripts):

Code:

#!/bin/bash

#Assignment 4 - Mail Users

if who | sed 's/ .*//g' | sort -u | grep "$*" > /dev/null
then
echo "$*" is logged in
else
echo "$*" not logged in
fi
if [ "$*" -eq 0 ]
then
echo no user specified
fi

mail "$*" << message
Hello `awk -F\: '{print $5}' /etc/passwd` please ignore this mail. My instructor requires that I send this message as part of an assignment for class 92.312. The current time and date is `date`. Have a nice day `$USER`.

END

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Umass-lowell, Lowell, Massachussetts. Mrichard. Unix shell programing.

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).