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1. Which of the following is a valid variable assignment?
- 2=xyz
- APP_VAR=’zero’
- alpha-init=5
- MY VAR= “set to one”
2. Shell variables are case insensitive.
True or False?
- True
- False
3. Which of the following is NOT a valid variable name?
- _LPIC
- VAR_1
- NEWVARIABLE
- 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?
- typeset –x ENV_VAR=1
- export ENV_VAR=1
- newvar –x ENV_VAR=1
- declare –x ENV_VAR=1
6. The ___________ command is used to display the value of a specific variable.
- value
- var
- echo
- set
7. Which command can be used to display both local and environment variables?
- export –p
- declare –x
- set
- env
8. A variable once declared cannot be deleted.True or False?
- True
- False
9. Which command can be used to delete a variable?
- rmvar
- set -r
- unset
- declare
10. PATH variable directories are searched __________ when executing a command.
- Left to right
- Right to left
- In no particular order
- 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?
- By typing the absolute or relative path to the command
- Rename the command and its directory
- Add the directory containing the command to the PATH variable
- Copy the command to a directory listed in the PATH
12. The command PATH=$PATH:/home/John does the following:
- Creates a new PATH variable with only the /home/John directory as the value
- Does nothing, because anything after the : is discarded
- Appends the directory /home/John to the existing PATH variable
- Replaces the existing directories in the PATH with the /home/John directory
13. Consider the following value of PATH variable: /bin:/usr/local/sbin:/home/joe/bin:/home/joe/test Joe modifies the my_scr.sh script, which is stored in the directory /home/joe/bin then places a copy of my_scr.sh in /home/joe/test. Executing my_scr.sh will:
- Run the original version of the script in the /home/joe/bin directory
- Check the timestamp and run the latest version of my_scr.sh
- Not run at all, reports error
- Run the new version of the script placed in /home/joe/test
14. The ___________ command can be used to check if the command already exists.
- type
- ex
- check
- command
15. Which of the following switches will include the full path in the prompt?
- \W
- \e
- \H
- \w
16. Defining the PS1 variable in an initialization file will make changes to the prompt persistent between logins.
True or False?
- True
- False
17. If the command HISTIGNORE=’ls*’ is placed in the ~/.bash_profile file, which of the following commands would not be placed in the history list?
- history
- ls –la
- cd
- cat
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 create “DOS-like” commands
- To make them run faster
- To include a command option by default
19. The command to remove an existing alias from the current shell is:
- alias –d
- unalias
- unset alias
- rmalias
20. The best way to group multiple commands and pass arguments is to:
- Create an alias
- Concatenate them
- Use functions
- Create an initialization file
21. A function accepts 3 arguments as input. The third argument of a function is identified as:
- $arg3
- $PATH
- $3
- $1
22. Changes in the __________ initialization file will affect all the users on the system.
- Global
- Local
- Network
- Shell
23. Local initialization files, by default, are stored in which directory?
- /etc
- User’s home directory
- /usr
- /bin
24. A Login BASH shell executes which of the following additional files (compared to an interactive BASH shell)?
- /etc/profile and /etc/bashrc
- /etc/profile and ~/.bashrc
- /etc/profile and either ~/.bash_profile or ~/.bash_login or ~/.profile
- ~/.bash_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
- /etc/config
- .profile
26. Sourcing is an effective way to test initialization file changes. Which of the following is used to source a file?
touchcommand- ~ character
- Either . character or the
sourcecommand - None of the above
27. Which script is executed when you exit the shell?
- /etc/bashrc
- ~/.bash_profile
- ~/.bashrc
- ~/.bash_logout
28. Typical BASH exit scripts are found in ~/.bash_logout and __________ files.
- /etc/bash_logout
- ~/.bash_profile
- /etc/bashrc
- /etc/profile
29. Most of the Linux commands used by regular users can be found in which directory?
- ~/bin
- /usr/bin
- /usr/local/sbin
- /sbin
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