What does the 'chmod 755' command do?

The command 'chmod 755' is used to set file permissions in Linux. When analyzing the meaning of '755', it is helpful to break it down into its numerical components, where each digit represents the permissions for different categories of users: the owner, the group, and others.

The first digit, '7', indicates the permissions for the owner of the file. In binary, '7' equates to '111', which means the owner has read (4), write (2), and execute (1) permissions.

The second digit, '5', represents the permissions for the group. In binary, '5' translates to '101', meaning the group has read (4) and execute (1) permissions, but does not have write permissions.

The third digit is also '5', which applies the same permissions to others, giving them read (4) and execute (1) permissions as well.

Thus, the complete breakdown of permissions with 'chmod 755' results in:

• Owner: read (r), write (w), execute (x)

• Group: read (r), execute (x)

• Others: read (r), execute (x)

This aligns perfectly with the description provided in the selected option, which