What does the 'chmod 755' command do?

The command 'chmod 755' is used to change the permissions of a file or directory in a Linux environment. The numbers in '755' represent a specific set of permissions for three different classes of users: the owner (user), the group, and others.

The first digit, '7', signifies that the owner of the file has full permissions: read (4), write (2), and execute (1). When you add these values together (4 + 2 + 1), you get 7, which allows the owner to read, write, and execute the file.

The second digit, '5', represents the permissions for the group associated with the file. A value of '5' corresponds to read (4) and execute (1) permissions. Adding these gives 5, meaning that the group can read and execute the file, but cannot modify it.

The third digit, which is also '5', applies to others (everyone else who is not the owner or in the group) and has the same interpretation: they can read and execute the file but cannot modify it.

Thus, 'chmod 755' ensures that the owner has full access, while the group and others can only read and execute, making the answer