Why pipes chain commands into workflows in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to list files and send the output to the next command using a pipe.

Linux CLI

ls [1] grep 'txt'

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 ';' runs commands sequentially but does not connect output.

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

The pipe symbol '|' sends the output of 'ls' as input to 'grep'.

2fill in blank

medium

Complete the command to count the number of lines containing 'error' in a log file using pipes.

Linux CLI

cat /var/log/syslog [1] grep 'error' [2] 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 breaks the chain.

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

The pipe '|' passes output from one command to the next in a chain.

3fill in blank

hard

Fix the error in the command that tries to list all '.log' files and count them using pipes.

Linux CLI

ls *.log [1] wc -l

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

A&

B|

C;

D||

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' or '||' instead of pipe breaks the data flow.

Using ';' runs commands separately without passing output.

The pipe '|' correctly sends the list output to 'wc -l' to count lines.

4fill in blank

hard

Fill both blanks to filter running processes for 'ssh' and then sort them by memory usage.

Linux CLI

ps aux [1] grep ssh [2] sort -k4 -nr

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

A|

B&

C;

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using ';' runs commands separately without passing output.

Using '&' runs commands in background, breaking the chain.

Pipes '|' chain the output of each command to the next for filtering and sorting.

5fill in blank

hard

Fill all three blanks to find all '.txt' files, count lines containing 'hello', and save the count to a file.

Linux CLI

find . -name '*.txt' [1] xargs grep 'hello' [2] wc -l [3] count.txt

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

A|

B>

Attempts:

3 left

💡 Hint

Common Mistakes

Using ';' instead of pipes breaks the data flow.

Using '|' instead of '>' for file redirection causes errors.

Use pipe '|' to chain commands and '>' to redirect final output to a file.