Module 7 Review Quiz Flashcards
Because stderr and stdout represent the results of a command and stdin represents the input required for a command, only stderr and stdout can be redirected to/from a file. True or False?
a. True
b. False
b. False
Before a user-defined variable can be used by processes that run in subshells, that variable must be __________.
a. imported
b. validated by running the env command
c. exported
d. redirected to the BASH shel
c. exported
Both aliases and functions can be used to store commands that can be executed, but functions can also accept positional parameters. True or False?
a. True
b. False
a. True
Which of the following files is always executed immediately after any user logs in to a Linux system and receives a BASH shell?
a. /etc/profile
b. ~/.bash_profile
c. ~/.bash_login
d. ~/.profile
a. /etc/profile
Which command could you use to see a list of all environment and user-defined shell variables as well as their current values?
a. ls /var
b. env
c. set
d. echo
c. set
Every if construct begins with if and must be terminated with? _________
a. end
b. endif
c. stop
d. fi
d. fi
Which of the following will display the message welcome home if the cd /home/user1 command is successfully executed?
a. cd /home/user1 && echo “welcome home”
b. cat “welcome home” || cd /home/user1
c. cd /home/user1 || cat “welcome home”
d. echo “welcome home” && cd /home/user1
a. cd /home/user1 && echo “welcome home”
The current value for the HOME variable is displayed by which of the following commands? (Choose all that apply.)
a. echo HOME=
b. echo ~
c. echo $HOME
d. echo ls HOME
b. echo ~
c. echo $HOME
Which of the following variables could access the value “/etc” within the sample shell script, if the sample shell script was executed using the bash sample /var /etc /bin command?
a. $0
b. $1
c. $2
d. $3
c. $2
Which of the following operators reverses the meaning of a test statement?
a. #!
b. -o
c. -a
d. !
d. !
What would be the effect of using the alias command to make an alias for the date command named cat in honor of your favorite pet?
a. It cannot be done as there already is an environment variable cat associated with the cat command.
b. It cannot be done because there already is a command cat on the system.
c. When you use the cat command at the command prompt with the intention of viewing a text file, the date appears instead.
d. There is no effect until the alias is imported because it is a user-declared variable.
c. When you use the cat command at the command prompt with the intention of viewing a text file, the date appears instead.
How do you indicate a comment line in a shell script?
a. There are no comment lines in a shell script.
b. Begin the line with #!.
c. Begin the line with !.
d. Begin the line with #.
d. Begin the line with #.
You have redirected stderr to a file called Errors. You view the contents of this file afterward and notice that there are six error messages. After repeating the procedure, you notice that there are only two error messages in this file. Why?
a. After you open the file and view the contents, the contents are lost.
b. The system generated different stdout.
c. You did not append the stderr to the Error file, and, as a result, it was overwritten when the command was run a second time.
d. You must specify a new file each time you redirect as the system creates the specified file by default.
c. You did not append the stderr to the Error file, and, as a result, it was overwritten when the command was run a second time.
The sed and awk commands are filter commands commonly used to format data within a pipe. True or False?
a. True
b. False
a. True
You attempt to perform the git commit -m “Added listdir function” but the command fails. What are possible reasons for the failure? (Choose all that apply.)
a. The user performing the commit has not set their Git user information.
b. No files were added to the Git index beforehand.
c. The user performing the commit is not running the command from within the Git repo directory.
d. The master branch was not specified within the command itself.
a. The user performing the commit has not set their Git user information.
b. No files were added to the Git index beforehand.
c. The user performing the commit is not running the command from within the Git repo directory.
