#!/bin/bash
#
# File: whos.sh
#
# Description: Displays information about the user using the first and fifth fields 
#              in the /etc/passwd file. The first field contains the username 
#              (e.g., campbell) and the fifth field contains the users full 
#              name (e.g., Andrew Campbell). You can provide a username or full name and
#              whos will return you the full name or username, respectively. This is 
#              similar in spirit to the finger utility (check it out).
#
# Input:       List of arguments can be usernames or login names.
#
# Output:      List of usernames or login names.
#
# Adapted from A Practical Guide to Linux (Sobell)

if [ $# -eq 0 ]
        then
                echo "Usage: whos arg needs to be [list of username or full name]" 1>&2
                exit 1
fi

for arg
do
        awk -F: '{print $1, $5}' /etc/passwd | grep -i "$arg"
done

exit 0