The document contains a list of 31 lab exercises for a UNIX class, including tasks to list environment variables and shells, edit profile files, create aliases, manage processes, and use commands like ls, grep, sort, and jobs. It instructs students to complete tasks like changing login prompts, redirecting command output to files, running commands in the background, and killing their own processes. The document is from the UNIX Department of the Information Technology Institute in Giza, Egypt.

1. Ministry of communications and Information Technology
Information Technology Institute
UNIX Department
ISO 9001
Lab 4
1- List the available shells in your system.
2- List the environment variables in your current shell.
3- List all of the environment variables for the bash shell.
4- What are the commands that list the values of all the variables?
5- What are the commands that list the value of a specific variable?
6- Display your current shell.
7- What is the difference between startup files and initialization files?
8- State the startup files of: sh, ksh, csh, bash.
9- State the initialization files of: sh, ksh, csh, bash.
10- Edit in your profile to display date at login and change your prompt permanently.
11- Execute the following command :
echo then press enter
Notice the prompt what is that and how can you change it.
12- Create a bash shell alias named ls for the “ls –l” command
13- List the user commands and redirect the output to /tmp/commands.list
14- Count the number of user commands
15- Get all the users names whose first character in their login is ‘g’.
16- Get the logins name and full names (comment) of logins starts with “gu”.
17- Save the output of the last command sorted by their full names in a file.
18- Write two commands: first: to search for all files on the system that named .bash_profile.
Second: sorts the output of ls command on / recursively, Saving their output and error in 2
different files and sending them to the background.
19- Display the number of users who is logged now to the system.
20- Display lines 7 to line 10 of /etc/passwd file
21- What happens if you execute:
cat filename1 | cat filename2
ls | rm
ls /etc/passwd | wc –l
22- Issue the command sleep 100.
23- Stop the last command.
24- Resume the last command in the background
25- Issue the jobs command and see its output.
26- Send the sleep command to the foreground and send it again to the background.
27- Kill the sleep command.
28- Display your processes only
29- Display all processes except yours
30- Use the pgrep command to list your processes only
31- Kill your processes only.
Information Technology Institute
241 Alharam Street
Giza 12111, Egypt.