Lesson 4: Use the Command Line Flashcards

• Describe when the command-line interface is useful. • Use man (manual) pages to find more information about commands. • Manipulate files in the command-line interface.

1
Q

What are some advantages of using the command-line interface?

A

The command-line interface provides these advantages:

  • Additional administrative and troubleshooting options
  • More access to the file system
  • A remote login using the Secure Shell (SSH) protocol
  • Any administrator can run commands as the system administrator user or root, using sudo
  • The ability to automate repetitive tasks using scripting
  • The ability to remotely administer multiple, even thousands, of Mac computers simultaneously using Apple Remote Desktop
  • The documentation found in man pages provides an explanation of command usage and references to other related commands
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2
Q

What are the four parts of a command string?

A

The four parts of a command string are as follows:

Example: ls -lah ~/ > ~/Desktop/homeDirectoryList.txt

  1. Command name
    • ls to “list directory contents”
  2. Command options
    • -l to “List in long format”
    • -a to “Include directory entries whose names begin with a dot (.)”
    • -h to “When used with the -l option, use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the number of digits to three or less using base 2 for sizes.”
  3. Arguments
    • ~/ the current user’s home directory is the target of action
  4. Extras
    • > ~/Desktop/homeDirectoryList.txt redirect the output of the ls command to a new file on the user’s Desktop called “homeDirectoryList.txt.”
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3
Q

Which terminal command should you use to perform the following tasks?

  • Print working directory
  • List
  • Change directory
  • Indicate parent directory
  • Indicate current user home folder
  • Create a folder
  • Run the command with root account access
  • Clear the Terminal screen
  • Use the Spotlight index to find a file
A

Use these commands to perform the following tasks:

  • Print working directory: pwd
  • List: ls
  • Change directory: cd
  • Indicate parent directory: ..
  • Indicate current user home folder: ~
  • Create a folder: mkdir
  • Run the command with root account access: sudo
  • Clear the Terminal screen: clear or press <kbd>Control-L</kbd>
  • You can search for files with the Spotlight index using mdfind
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4
Q

Which key should you use if you want to automatically complete filenames, pathnames, and command names?

A

You should use the <kbd>Tab</kbd> key to automatically complete filenames, pathnames, and command names.

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5
Q

What is the new default shell interpreter in macOS Big Sur?

A

The Z shell (zsh) is now the default shell in macOS Big Sur, but the bash shell is still available.

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