Permission notation (rwxrwxrwx) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show the permissions of a file named example.txt.

Linux CLI

ls -l [1]

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

A-a

B-l

Cexample.txt

D-h

Attempts:

3 left

💡 Hint

Common Mistakes

Using options like -a or -h instead of the filename.

Omitting the filename argument.

The command ls -l example.txt lists detailed information including permissions for the file named example.txt.

2fill in blank

medium

Complete the code to add execute permission for the user on script.sh.

Linux CLI

chmod u[1] script.sh

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

A+x

B-x

C-r

D+r

Attempts:

3 left

💡 Hint

Common Mistakes

Using -x which removes execute permission.

Using +r which adds read permission instead.

The command chmod u+x script.sh adds execute permission for the user (owner) on the file script.sh.

3fill in blank

hard

Fix the error in the command to remove write permission for the group on data.txt.

Linux CLI

chmod g[1] data.txt

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

A-x

B+w

C+x

D-w

Attempts:

3 left

💡 Hint

Common Mistakes

Using +w which adds write permission instead of removing it.

Using -x which removes execute permission instead.

To remove write permission for the group, use chmod g-w data.txt.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps filenames to their permission strings if the permission starts with 'r'.

Linux CLI

permissions = {file: perm for file, perm in files.items() if perm[1]('r') and perm[0][2]'r'}

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

Astartswith

B==

C!=

Dendswith

Attempts:

3 left

💡 Hint

Common Mistakes

Using endswith instead of startswith.

Using != instead of ==.

The code filters files whose permission string starts with 'r' and equals 'r' at position 0 using startswith and ==.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps filenames to their permission length if the permission contains 'x' and length is greater than 5.

Linux CLI

result = { [1]: len([2]) for [1], [2] in perms.items() if 'x' in [2] and len([2]) [3] 5 }

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

Afilename

Bperm

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for both key and value.

Using == instead of > for length comparison.

The comprehension uses filename and perm as variable names and checks if length of permission is greater than 5 with >.