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Questions and Answers
What is the primary function of the type command?
What is the primary function of the type command?
- Create a new file
- Delete a file
- Display information about a file
- Identify whether a file is a program (correct)
When using a long option, how many hyphens are required before the option name?
When using a long option, how many hyphens are required before the option name?
- Three hyphens
- One hyphen
- Two hyphens (correct)
- No hyphens
Which action does the uname command perform?
Which action does the uname command perform?
- Manage users on the system
- Navigate the file system
- Modify file permissions
- Display system information (correct)
What does the -a option with the ls command do?
What does the -a option with the ls command do?
How do you remove an alias in Unix?
How do you remove an alias in Unix?
True or False: The type command in Unix can only identify whether a file is a program.
True or False: The type command in Unix can only identify whether a file is a program.
What is the primary purpose of using arguments in a shell?
What is the primary purpose of using arguments in a shell?
How many times can you use the * glob character in a pattern?
How many times can you use the * glob character in a pattern?
What does the -r option do with the ls command?
What does the -r option do with the ls command?
What does the asterisk (*) wildcard match?
What does the asterisk (*) wildcard match?
What is the main function of the cal command?
What is the main function of the cal command?
What is globbing?
What is globbing?
Is it true that the touch command can only be used to create new files?
Is it true that the touch command can only be used to create new files?
If you want to locate all files named 'config.sys' on the system, which command would you use?
If you want to locate all files named 'config.sys' on the system, which command would you use?
What purpose does using arguments serve when starting a new program?
What purpose does using arguments serve when starting a new program?
How can you create a new directory named 'new_project'?
How can you create a new directory named 'new_project'?
What type of information does the -r option provide when used with the ls command?
What type of information does the -r option provide when used with the ls command?
What does the * glob character match?
What does the * glob character match?
What does the 'whatis' command provide?
What does the 'whatis' command provide?
How do you unset a variable in a Linux environment?
How do you unset a variable in a Linux environment?
What is the correct way to create a new environment variable?
What is the correct way to create a new environment variable?
How can you display the value of a variable in a Linux environment?
How can you display the value of a variable in a Linux environment?
Which of the following statements accurately describes the difference between local and environment variables?
Which of the following statements accurately describes the difference between local and environment variables?
What is the main difference between local and global initialization files?
What is the main difference between local and global initialization files?
What file is typically executed first when Bash starts as a login shell?
What file is typically executed first when Bash starts as a login shell?
How can you view the contents of hidden files in your home directory?
How can you view the contents of hidden files in your home directory?
What is the role of global initialization files?
What is the role of global initialization files?
Which type of user is primarily associated with local initialization files?
Which type of user is primarily associated with local initialization files?
In the context of shell startup, what does ~/.bashrc typically contain?
In the context of shell startup, what does ~/.bashrc typically contain?
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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.
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