2. Write a shell script that uses a for loop to add .bac as the extension to the end of each file name that has a character f at the beginning under current directory. You wont get any credit if dont write a shell script.

Hints:

Use regular expression to represent the group of file names

You can use mv command to change file name.

3. Answer the following questions.

(a) If the output of ps ef command is as follows, write an awk command that will display UID, PID, and COMMAND fields separated by a , and in the order only for the processes created by a user whose user name (UID) starts with f.

$ ps -ef

UID PID PPID TTY STIME COMMAND

fan1234 7236 1 con 22:27:59 /usr/bin/bash

fan1234 11148 7236 con 23:30:34 /usr/bin/ps