Customizing the Bash Shell

Question 1

env

Answer 1

Displays all environment variables

Question 2

$USER

Answer 2

• Current user’s username.

- “whoami” displays this

Question 3

$SHELL

Answer 3

Shell the user is working as

Question 4

$TERM

Answer 4

Current terminal

Question 5

$PS1

Answer 5

Default bash prompt

Question 6

\h

Answer 6

hostname

Question 7

\w

Answer 7

current working directory (shows entire path)

Question 8

\W

Answer 8

current working directory (only shows the one specific directory name you are in)

Question 9

\u

Answer 9

username

Question 10

\@

Answer 10

12 hour am/pm date

Question 11

\t

Answer 11

24 hour hh:mm:ss

Question 12

\T

Answer 12

12 hour hh:mm:ss

Question 13

\j

Answer 13

number of jobs running on the shell

Question 14

\d

Answer 14

date

Question 15

\H

Answer 15

full hostname

Question 16

$HOME

Answer 16

User’s home directory path

Question 17

$LD_LIBRARY_PATH

Answer 17

Directory in which libraries are found and bin executable files are located

Question 18

$HOSTNAME

Answer 18

System hostname

Question 19

$PWD

Answer 19

Current working directory

Question 20

$EDITOR

Answer 20

Default editor when the system opens files

Question 21

$MAIL

Answer 21

Holds the location of the users mail spool

Question 22

Create an alias to the command “vi file.txt” called openfile

Answer 22

alias openfile=”vi file.txt”

Question 23

Global bash config file

Answer 23

/etc/bashrc (Red Hat/CentOS)

/etc/bash.bashrc (Debian/Ubuntu)

Question 24

Directory containing what should be given to new users by default when they are created

Answer 24

/etc/skel

Question 25

/etc/profile

Answer 25

File used to set/change shell variables for all users

Question 26

~/.bash_login

Answer 26

File is executed when a user logs in to the shell

Question 27

~/.bash_logout

Answer 27

File is executed when a user exits the shell

Question 28

env -u

Answer 28

Remove a specific environment variable

Question 29

~/.profile

Answer 29

Used to change shell variables for a specific user

Question 30

How to declare a bash function

Answer 30

functionName() {

}

Question 31

unset

Answer 31

Unset an environment variable

Question 32

~/.bashrc

Answer 32

File used to alter an individual user’s environment

Question 33

bash -r

Answer 33

Restrictive mode for bash shell