Subshells (command grouping) in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run two commands in a subshell.

Bash Scripting

(echo "Hello" [1] echo "World")

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

A&&

B;

C|

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' will run the second command only if the first succeeds.

Using '|' pipes output, not just separates commands.

Using '&' runs commands in background, not sequentially.

Using a semicolon inside parentheses runs both commands sequentially in a subshell.

2fill in blank

medium

Complete the code to capture the output of commands run in a subshell.

Bash Scripting

result=$(echo "Start" [1] echo "End")

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

A&

B&&

C|

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' may skip second command if first fails.

Using '|' pipes output, changing what is captured.

Using '&' runs commands in background, output may be lost.

Using a semicolon inside the subshell groups commands and captures combined output.

3fill in blank

hard

Fix the error in the code to run commands in a subshell and redirect output.

Bash Scripting

(cd /tmp [1] ls) > output.txt

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

A;

B&&

C|

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' may skip 'ls' if 'cd' fails.

Using '|' pipes output, changing behavior.

Using '&' runs commands in background, output redirection may fail.

Using a semicolon correctly separates commands inside the subshell before redirecting output.

4fill in blank

hard

Fill both blanks to run commands in a subshell and combine outputs.

Bash Scripting

(echo "User:" [1] whoami [2] echo "Done")

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

A;

B&&

C|

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&&' skips commands if previous fails.

Using '|' pipes output, changing flow.

Using '&' runs commands in background, not sequentially.

Semicolons separate commands to run sequentially inside the subshell.

5fill in blank

hard

Fill all three blanks to create a dictionary-like output with command grouping and condition.

Bash Scripting

output=$( { echo "Start" [1] if [[ -f /etc/passwd ]]; then echo "File exists" [2] else echo "No file"; fi [3] echo "End"; } )

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

A;

B&&

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting semicolons causes syntax errors.

Using '&&' changes flow to conditional execution.

Using '|' pipes output, not suitable here.

Semicolons separate commands and statements inside the grouped commands for proper execution.