Workbook 6

Question 1

What is the default shell in Red Hat Enterprise Linux?

Answer 1

/bin/bash

Question 2

Which of the following would the bash shell interpret as a comment?

Answer 2

blagh

Question 3

For which of the following tasks is the bash shell commonly used?

Answer 3

Interactively running commands for users

Automated execution of commands from scripts

Question 4

pon startup, commands from what file are automatically executed by bash?

Answer 4

~/.bashrc

Question 5

Which of the following key sequences can be used to access portions of bash’s command history?

Answer 5

ESC+

Question 6

Which command is used to list bash’s command history?

Answer 6

history

Question 7

Command Output
bash: timelog: Permission denied
timestamp failed
Q) Which of the following command lines could have produced the messages?

Answer 7

date&raquo_space; timelog || echo timestamp failed
or
date&raquo_space; timelog ; echo timestamp failed

Question 8

Which of the following would run the chmod command only if the mkdir command succeeds?

Answer 8

mkdir mail && chmod 700 mail

Question 9

Which of the following would run the chmod command only if the mkdir command fails?

Answer 9

mkdir mail || chmod 700 mail

Question 10

Which of the following would run the chmod command regardless of the success or failure of the mkdir command?

Answer 10

mkdir mail ; chmod 700 mail

Question 11

Which of the following is the correct way to run the cd and ls commands in a single subshell?

Answer 11

( cd /etc ; ls)

Question 12

After successfully executing the command line from the previous question, what will your current working directory be?

Answer 12

The same directory from which the command line was executed. The current shell’s working directory would not change.

Question 13

After running the command line cd /tmp; ls, what is your current working directory?

Answer 13

/tmp (((Chapter 3 WN 6)))