Ch1 Advanced Shell Features Exam

  1. Which of the following is a valid variable assignment?

    •  alpha-init=5
    •  MY VAR= “set to one”
    •  2=xyz
    •  APP_VAR=’zero’
  2. Shell variables are case sensitive. True or False?

    • True
    • False
  3. Which of the following is not a valid variable name?

    •  VAR_1
    •  _LPIC
    •  2_VAR
  4. A new environment variable can be exported and assigned a value with a single command. True or False?

    • True 
    • False
  5. Which of the following is not a valid command for variable declaration?

    • export ENV_VAR=1 
    • newvar -x ENV_VAR=1 
    • typeset -x ENV_VAR=1 
    • declare -x ENV_VAR=1
  6. The ___________ command is used to display the value of a specific variable.

    • set 
    • var 
    • echo 
    • value
  7. Which command can be used to display both local and environment variables?

    • set 
    • declare -x
    • env 
    • export -p
  8. Once a variable is declared, it cannot be deleted.

    True or False?

    • True 
    • False
  9. Which of the following commands can be used to delete a variable?

    • rmvar 
    • declare 
    • set -r 
    • unset
  10. The PATH variable directories are searched __________ when executing a command.

    • Left to right 
    • In no particular order 
    • Right to left 
    • Including only the first 256 characters
  11. Which of the following is not a valid option for executing a command that is not in the directories listed in the PATH variable?

    • Add the directory containing the command to the PATH variable 
    • Copy the command to a directory listed in the PATH 
    • By typing the absolute or relative path to the command 
    • Rename the command and its directory
  12. The command PATH=$PATH:/home/Alice does the following:

    • Creates a new PATH variable with only the /home/Alice directory as the value 
    • Replaces the existing directories in the PATH with the /home/Alice directory 
    • Appends the directory /home/Alice to the existing PATH variable 
    • Does nothing, because anything after the :is discarded
  13. Consider the following value of PATH variable:/bin:/usr/local/sbin:/home/tom/bin:/home/tom/test

    Tom modifies the script, which is stored in the directory /home/tom/bin then places a copy of in /home/tom/test. Executing will: 

    • Run the original version of the script in the /home/tom/bin directory 
    • Run the new version of the script placed in /home/tom/test 
    • Check the timestamp and run the latest version of 
    • Not run at all, reports error
  14. The ___________ command can be used to check if a command already exists.

    • check 
    • type 
    • ex 
    • command
  15. Which of the following switches will include the full path in the prompt?

    • \H 
    • \w 
    • \e 
    • \W
  16. Defining the PS1 variable in an initialization file will not make changes to the prompt persistent between logins.

    True or False?

    • True 
    • False
  17. If the HISTIGNORE='ls*' command is placed in the ~/.bash_profile file, which of the following commands would not be placed in the history list?

    • cat 
    • history 
    • cd 
    • ls -la
  18. Which of the following is not a purpose for creating an alias?

    • To create a short nickname for a long command or series of commands 
    • To make commands run faster 
    • To include a command option by default 
    • To create DOS-like commands
  19. The command to remove an existing alias from the current shell is:

    • unalias 
    • rmalias 
    • alias -d 
    • unset alias
  20. The best way to group multiple commands and pass arguments is to:

    • Concatenate them 
    • Use functions 
    • Create an alias 
    • Create an initialization file
  21. A function is given 3 arguments as input. The third argument of a function is identified as:

    • $PATH 
    • $1 
    • $3 
    • $arg3
  22. Changes in the __________ initialization file will affect all the users on the system.

    • Global 
    • Shell 
    • Local 
    • Network
  23. Local initialization files, by default, are stored in which directory?

    • /etc 
    • /bin 
    • /usr 
    • User’s home directory
  24. A login BASH shell executes which of the following additional files (compared to an interactive BASH shell)?

    • /etc/profile and either ~/.bash_profile or ~/.bash_login or ~/.profile 
    • ~/.bash_profile and ~/.bashrc 
    • /etc/profile and /etc/bashrc 
    • /etc/profile and ~/.bashrc
  25. Administrators use the __________ file to create key environment variables and set key system values for every user.

    • /etc/bashrc 
    • /etc/profile 
    • .profile 
    • /etc/config
  26. Sourcing is an effective way to test initialization file changes. Which of the following is used to source a file?

    • The touch command
    • The tilde ~ character 
    • None of the above 
    • Either the period . character or the source command
  27. Which script is executed when you exit the shell?

    • ~/.bashrc 
    • ~/.bash_logout 
    • /etc/bashrc 
    • ~/.bash_profile
  28. Typical BASH exit scripts are found in ~/.bash_logout and __________ files.

    • ~/.bash_profile 
    • /etc/bash_logout 
    • /etc/profile 
    • /etc/bashrc
  29. Most of the Linux commands used by regular users can be found in which directory?

    • /sbin 
    • ~/bin 
    • /usr/bin 
    • /usr/local/sbin