What does the command 'chmod 755 file.txt' do?

The command 'chmod 755 file.txt' modifies the file permissions for 'file.txt' in the following way: It assigns permissions so that the file owner has read, write, and execute permissions (represented by the '7'), while both the group and others have read and execute permissions (represented by '5').

To break it down, the numeric permissions are calculated as follows:

• The first digit (7) for the owner is the sum of read (4), write (2), and execute (1) permissions, which totals to 7.

• The second digit (5) for the group adds up the read (4) and execute (1) permissions without write permission, totaling 5.

• The third digit (5) for others is the same as for the group, granting read and execute permissions but not write.

This command structure is commonly used in Linux to control who can access and modify files, ensuring that certain actions can be restricted to particular users based on their roles or needs.

The other choices do not accurately reflect the impact of the 'chmod 755' command. For instance, granting only read and write permissions to the owner, or removing all permissions, does not align with the defined numeric values in this