29 Questions
What is the primary function of the type command?
Identify whether a file is a program
When using a long option, how many hyphens are required before the option name?
Two hyphens
Which action does the uname command perform?
Display system information
What does the -a option with the ls command do?
Display hidden files
How do you remove an alias in Unix?
unalias name
True or False: The type command in Unix can only identify whether a file is a program.
True
What is the primary purpose of using arguments in a shell?
To specify options for a command
How many times can you use the * glob character in a pattern?
Without limits
What does the -r option do with the ls command?
Lists files in reverse alphabetical order
What does the asterisk (*) wildcard match?
Any string, including the empty string
What is the main function of the cal command?
Display a calendar for a specific month and year
What is globbing?
A way to match multiple files using wildcards
Is it true that the touch command can only be used to create new files?
False
If you want to locate all files named 'config.sys' on the system, which command would you use?
find / -name config.sys
What purpose does using arguments serve when starting a new program?
To change the behavior of the shell
How can you create a new directory named 'new_project'?
mkdir new_project
What type of information does the -r option provide when used with the ls command?
'r' stands for 'recursive'
What does the * glob character match?
Any string of characters, including none
What does the 'whatis' command provide?
A brief description of a command
How do you unset a variable in a Linux environment?
unset $variable
What is the correct way to create a new environment variable?
export name=value
How can you display the value of a variable in a Linux environment?
echo $variable
Which of the following statements accurately describes the difference between local and environment variables?
Local variables are deleted when the program exits, while environment variables persist across programs.
What is the main difference between local and global initialization files?
Local files are specific to a user, global files affect all users.
What file is typically executed first when Bash starts as a login shell?
/etc/profile
How can you view the contents of hidden files in your home directory?
Use the ls command with the -a option.
What is the role of global initialization files?
To affect all users' shell environments.
Which type of user is primarily associated with local initialization files?
Regular users
In the context of shell startup, what does ~/.bashrc typically contain?
User-specific Bash settings
Study Notes
Using Arguments in Shell Commands
- Arguments are used to change the behavior of the shell, specify options for a command, provide additional information to a command, or start a new program.
The ls Command
- The
-roption with thelscommand lists files in reverse alphabetical order. - The
-aoption with thelscommand displays hidden files.
The cal Command
- The
calcommand displays a calendar for a specific month and year.
The touch Command
- The
touchcommand is not only used to create new files, but also to update the timestamp of existing files.
The uname Command
- The primary function of the
unamecommand is to display system information.
Removing Aliases
- To remove an alias, use the
unaliascommand followed by the name of the alias.
The type Command
- The
typecommand identifies whether a file is a program or a shell builtin.
Long Options
- A long option requires two hyphens (--) before the option name.
Setting and Unsetting Variables
- To set a new environment variable, use the
name=valuesyntax followed by theexportcommand. - To unset a variable, use the
unsetcommand followed by the name of the variable. - To display the value of a variable, use the
echocommand followed by the variable name.
Local and Environment Variables
- Local variables are deleted when the program exits, while environment variables persist across programs.
- Environment variables are case-sensitive.
Bash Startup Files
- The
~/.bash_profilefile is typically executed first when Bash starts as a login shell.
Viewing Hidden Files
- To view the contents of hidden files in your home directory, use the
lscommand with the-aoption.
Globbing
- Globbing is a way to match multiple files using wildcards.
- The asterisk (*) wildcard matches any string, including the empty string.
Locating Files
- To locate all files named 'config.sys' on the system, use the
findcommand with the-nameoption.
Test your knowledge of Linux command line basics with this quiz. Questions cover topics such as command information with 'whatis', unsetting variables, and creating new environment variables.
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