History command and search in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show the last 10 commands from your history.

Linux CLI

history [1]

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

A| tail -10

B-10

C-n 10

D-c 10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'history -10' which is not a valid option.

Using 'history -n 10' which reads new history lines, not last 10 commands.

The command 'history | tail -10' shows the last 10 commands from the history list.

2fill in blank

medium

Complete the code to search your command history for the word 'git'.

Linux CLI

history | grep [1]

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

A'git'

B'grep'

C"git"

Dgit

Attempts:

3 left

💡 Hint

Common Mistakes

Including quotes that may cause grep to look for literal quotes.

Searching for 'grep' instead of 'git'.

Using 'history | grep git' searches the history output for the word git.

3fill in blank

hard

Fix the error in the command to recall the last command starting with 'ssh'.

Linux CLI

![1]

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

Ass

Bssh

Csh

Dssh -p

Attempts:

3 left

💡 Hint

Common Mistakes

Typing incomplete command start like 'ss' or 'sh'.

Adding extra options after the bang which is invalid.

Using '!ssh' recalls the last command starting with 'ssh'.

4fill in blank

hard

Fill both blanks to create a command that searches history for 'docker' and shows only the last 5 results.

Linux CLI

history | grep [1] | tail [2]

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

Adocker

B10

C-5

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-5' with tail which is invalid.

Searching for wrong keyword in grep.

The command 'history | grep docker | tail 5' shows the last 5 history entries containing 'docker'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps command numbers to commands containing 'python' from history output.

Linux CLI

commands = [1]: [2] for line in history_output if '[3]' in line}

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

Aline.split()[0]

B'python'

C' '.join(line.split()[1:])

Dline

Attempts:

3 left

💡 Hint

Common Mistakes

Using the whole line as key or value without splitting.

Checking for wrong keyword in the if condition.

This comprehension maps the command number (first word) to the command text (rest of the line) for lines containing 'python'.