stderr redirection (2>, 2>>) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to redirect error messages to a file, replacing its content.

Linux CLI

ls /nonexistent_directory [1] error.log

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

A>

B2>

C1>

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' redirects standard output, not error.

Using '>>' appends instead of replacing.

Using '2>' redirects the standard error (stderr) to the file, replacing its content.

2fill in blank

medium

Complete the code to append error messages to a file without overwriting it.

Linux CLI

grep 'pattern' file.txt [1] errors.log

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

A2>>

B2>

C>>

D1>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '2>' overwrites the file instead of appending.

Using '>>' redirects standard output, not error.

Using '2>>' appends the standard error output to the file without overwriting existing content.

3fill in blank

hard

Fix the error in the code to correctly redirect only error messages to a file.

Linux CLI

cat missingfile.txt [1] errors.txt

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

A2>

B1>

C>

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' redirects standard output, missing error messages.

Using '1>' redirects standard output, not error.

To redirect only error messages, use '2>' which targets stderr.

4fill in blank

hard

Fill both blanks to redirect standard output to output.log and append errors to error.log.

Linux CLI

command [1] output.log [2] error.log

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

A>

B2>>

C2>

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '2>' instead of '2>>' will overwrite error.log.

Using '>>' for standard output appends instead of overwriting.

Use '>' to overwrite standard output file and '2>>' to append errors to error.log.

5fill in blank

hard

Fill all three blanks to redirect standard output to output.log, overwrite errors to error.log, and append errors to error_append.log.

Linux CLI

cmd [1] output.log [2] error.log [3] error_append.log

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

A>

B2>

C2>>

D>>

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up '2>' and '2>>' causes wrong file behavior.

Using '>>' without '2' redirects standard output, not errors.

Use '>' to overwrite standard output, '2>' to overwrite errors, and '2>>' to append errors.