Aliases for shortcuts in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an alias named ll that lists files in long format.

Linux CLI

alias ll='ls [1]'

Drag options to blanks, or click blank then click option'

A-h

B-a

C-l

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Using -a shows hidden files but not long format.

Using -h shows sizes in human-readable form but needs -l for details.

The -l option with ls shows files in long listing format.

2fill in blank

medium

Complete the alias to clear the terminal screen using the clear command.

Linux CLI

alias cls='[1]'

Drag options to blanks, or click blank then click option'

Aclear

Breset

Ccls

Dclean

Attempts:

3 left

💡 Hint

Common Mistakes

Using cls works in Windows but not in Linux.

Using reset clears and resets terminal but is different.

The clear command clears the terminal screen.

3fill in blank

hard

Fix the error in the alias that should show disk usage in human-readable form.

Linux CLI

alias disk='du -[1]h'

Drag options to blanks, or click blank then click option'

As

Bh

Ca

Dc

Attempts:

3 left

💡 Hint

Common Mistakes

Using -s summarizes but does not format sizes.

Using -c adds totals but no human-readable sizes.

The -h option shows sizes in human-readable format for du.

4fill in blank

hard

Fill both blanks to create an alias gs that runs git status.

Linux CLI

alias gs='git [1] [2]'

Drag options to blanks, or click blank then click option'

Astatus

Bcommit

C-s

D-v

Attempts:

3 left

💡 Hint

Common Mistakes

Using commit runs a different command.

Using -v shows verbose output, not short status.

The alias runs git status -s for a short status summary.

5fill in blank

hard

Fill all three blanks to create an alias llh that lists files long format with human-readable sizes and shows hidden files.

Linux CLI

alias llh='ls [1] [2] [3]'

Drag options to blanks, or click blank then click option'

A-l

B-a

C-h

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting -a hides hidden files.

Using -r reverses order but is not needed here.

The alias uses -l for long format, -a to show hidden files, and -h for human-readable sizes.

Practice

1. What does the command alias ll='ls -l' do in a Linux shell?

easy

A. Runs the ls -l command immediately

B. Deletes the ll command permanently

C. Lists all aliases currently set

D. Creates a shortcut named ll that runs ls -l

Solution

1. Step 1: Understand the alias syntax

   The command alias name='command' creates a shortcut named name for the given command.

2. Step 2: Apply to given example

   Here, ll is set as a shortcut for ls -l, so typing ll runs ls -l.

3. Final Answer:

   Creates a shortcut named ll that runs ls -l -> Option D

4. Quick Check:

   alias creates shortcut = A [OK]

Hint: Alias syntax is alias name='command' to create shortcuts [OK]

Common Mistakes:

• Thinking alias runs the command immediately
• Confusing alias with deleting commands
• Assuming alias lists all commands

2. Which of the following is the correct syntax to create an alias named gs for the command git status?

easy

A. alias gs = git status

B. alias gs='git status'

C. alias 'gs' = 'git status'

D. alias gs: git status

Solution

1. Step 1: Recall correct alias syntax

   The correct syntax is alias name='command' without spaces around the equal sign.

2. Step 2: Match options to syntax

   alias gs='git status' matches exactly: alias gs='git status'. Others have spaces or wrong punctuation.

3. Final Answer:

   alias gs='git status' -> Option B

4. Quick Check:

   Correct alias syntax = B [OK]

Hint: No spaces around = and use single quotes for commands [OK]

Common Mistakes:

• Adding spaces around equal sign
• Using colons or other punctuation instead of =
• Putting quotes around alias name

3. Given the alias alias ll='ls -l' and the command ll /tmp, what will be the output?

medium

A. Lists files in /tmp in long format

B. Shows an error: command not found

C. Lists files in current directory only

D. Prints the text 'll /tmp'

Solution

1. Step 1: Understand alias expansion

   The alias ll replaces ll with ls -l when typed.

2. Step 2: Apply alias with argument

   Typing ll /tmp runs ls -l /tmp, listing files in /tmp in long format.

3. Final Answer:

   Lists files in /tmp in long format -> Option A

4. Quick Check:

   Alias expands command with arguments = A [OK]

Hint: Alias replaces command name but keeps arguments [OK]

Common Mistakes:

• Thinking alias ignores arguments
• Expecting alias to print text
• Assuming alias causes error

4. You run alias ll='ls -l' but typing ll gives an error: command not found. What is the likely problem?

medium

A. The alias was set in a different shell session

B. You typed the alias command incorrectly

C. You forgot to export the alias

D. The ls command is missing

Solution

1. Step 1: Understand alias scope

   Aliases last only for the current shell session unless saved in config files.

2. Step 2: Identify cause of error

   If you set alias in one session but use another, the alias is not known, causing 'command not found'.

3. Final Answer:

   The alias was set in a different shell session -> Option A

4. Quick Check:

   Aliases are session-specific unless saved = C [OK]

Hint: Aliases vanish when shell closes unless saved [OK]

Common Mistakes:

• Thinking aliases need export
• Assuming alias command syntax error
• Blaming missing system commands

5. You want to create an alias update that runs sudo apt update && sudo apt upgrade -y. Which command correctly creates this alias so it works as expected?

hard

A. alias update='sudo apt update; sudo apt upgrade -y'

B. alias update = "sudo apt update && sudo apt upgrade -y"

C. alias update='sudo apt update && sudo apt upgrade -y'

D. alias update='sudo apt update & sudo apt upgrade -y'

Solution

1. Step 1: Understand command chaining in alias

   The && operator runs the second command only if the first succeeds, which is desired here.

2. Step 2: Check alias syntax and chaining

   The correct form is alias update='sudo apt update && sudo apt upgrade -y', which uses no spaces around =, single quotes, and && for conditional chaining. Forms with spaces around = cause syntax errors. Using ; runs the upgrade regardless of update's success. Using & runs upgrade in background.

3. Final Answer:

   alias update='sudo apt update && sudo apt upgrade -y' -> Option C

4. Quick Check:

   Correct alias syntax with && = D [OK]

Hint: Use && to run second command only if first succeeds [OK]

Common Mistakes:

• Using single & instead of &&
• Using ; which ignores success of first command
• Mixing quote types incorrectly