Command chaining (&&, ||, ;) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run echo Hello only if ls succeeds.

Linux CLI

ls [1] echo Hello

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

A;

B|

C&&

D||

Attempts:

3 left

💡 Hint

Common Mistakes

Using '||' runs the second command only if the first fails.

Using ';' runs commands regardless of success.

Using '|' pipes output, not for conditional chaining.

The '&&' operator runs the second command only if the first command succeeds.

2fill in blank

medium

Complete the code to run echo Failed only if cat file.txt fails.

Linux CLI

cat file.txt [1] echo Failed

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

A||

B;

C&&

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' runs the second command only if the first succeeds.

Using ';' runs commands regardless of success.

Using '|' pipes output, not for conditional chaining.

The '||' operator runs the second command only if the first command fails.

3fill in blank

hard

Fix the error in the command to run echo Done after mkdir test regardless of success.

Linux CLI

mkdir test [1] echo Done

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

A;

B||

C&&

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' runs second command only on success.

Using '||' runs second command only on failure.

Using '|' pipes output, not for chaining commands.

The ';' operator runs the second command regardless of the first command's success or failure.

4fill in blank

hard

Fill both blanks to run echo Success if grep 'hello' file.txt succeeds, else run echo Fail.

Linux CLI

grep 'hello' file.txt [1] echo Success [2] echo Fail

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

A&&

B||

C;

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using ';' runs all commands regardless of success.

Using '|' pipes output, not for conditional chaining.

Swapping '&&' and '||' changes logic.

Use '&&' to run 'echo Success' if grep succeeds, and '||' to run 'echo Fail' if grep fails.

5fill in blank

hard

Fill both blanks to run echo Start, then run ls /tmp if echo Start succeeds, else run echo Error.

Linux CLI

; echo Start [1] ls /tmp [2] echo Error

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

A;

B&&

C||

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '|' instead of ';' causes piping, not sequencing.

Mixing order of '&&' and '||' changes logic.

Using only ';' runs all commands regardless of success.

Use ';' to run 'echo Start' first, then '&&' to run 'ls /tmp' if 'echo Start' succeeds, and '||' to run 'echo Error' if 'ls /tmp' fails.