Pipe operator (|) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to list all files and then count the lines using the pipe operator.

Linux CLI

ls -l [1] wc -l

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

A|

B&

C>

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&' runs commands in background, not piping output.

Using '>' redirects output to a file, not to another command.

Using ';' runs commands sequentially but does not pipe output.

The pipe operator '|' sends the output of the first command as input to the second command.

2fill in blank

medium

Complete the code to find all '.txt' files and count them using the pipe operator.

Linux CLI

find . -name '*.txt' [1] wc -l

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

A;

B|

C&&

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' instead of pipe, which does not pass output.

Using '>' redirects output to a file, not to another command.

Using ';' runs commands one after another without piping.

The pipe '|' passes the list of found files to 'wc -l' to count them.

3fill in blank

hard

Fix the error in the code to correctly pipe the output of 'ps aux' to 'grep bash'.

Linux CLI

ps aux [1] grep bash

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

A|

B>

C||

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&' runs command in background, not piping output.

Using '||' runs second command only if first fails, no piping.

Using '>' redirects output to a file, not to another command.

The pipe '|' correctly sends the output of 'ps aux' to 'grep bash' for filtering.

4fill in blank

hard

Fill both blanks to list all running processes and filter those containing 'ssh'.

Linux CLI

ps [1] [2] grep ssh

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

Aaux

B|

C-ef

D&&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' instead of pipe, which does not pass output.

Using 'aux' with '&&' instead of pipe.

Not using any option with 'ps' to list all processes.

Use 'ps -ef' to list all processes and pipe '|' to 'grep ssh' to filter them.

5fill in blank

hard

Fill all three blanks to list files, filter those with '.log', and count them.

Linux CLI

ls [1] [2] grep [3] | wc -l

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

A-l

B|

C.log

D-a

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-a' instead of '-l' for listing files.

Using ';' or '&&' instead of pipe '|'.

Not specifying '.log' to filter log files.

Use 'ls -l' to list files, pipe '|' to 'grep .log' to filter log files, then count lines with 'wc -l'.