CMPS 4350 - Presentation

Current Users and Active Terminals

GREP

Bash Scripts that can be used to gather information using GREP and WHO.

Example:

#!/bin/bash

logged_in_users=$(who)

echo"$logged_in_users" | grep -o "tty[0-9]*" | sort | uniq -c

- WHO gets the list of all logged in users

- grep -o is used to gather only the information that lie within tty[0-9]* which are the parameters it is searching for which are the terminal and terminal number. It will then sort by the amount of times each terminal appears.

"w" - Command

"W" shows who is currently logged on and how many terminals they are currently using. It displays the users name, concurrent time and active teminals, their IP Address and what file they are currently working on.