What does the 'chmod 755' command do?

The command 'chmod 755' is used to set specific permissions for a file or directory in Linux. In the context of this command, the number '755' is made up of three digits, each representing different categories of users: the owner, the group, and others.

Each digit in '755' corresponds to permission settings:

• The first digit (7) refers to the owner's permissions. The number '7' means that the owner has read (4), write (2), and execute (1) permissions, which when summed gives 7.

• The second digit (5) applies to the group that the file belongs to. The number '5' indicates that group members have read (4) and execute (1) permissions but not write permissions, resulting in a total of 5.

• The third digit (5) applies to all other users (others). Similar to the group, they also have read (4) and execute (1) permissions without write permissions, totaling 5.

Thus, the complete set of permissions for 'chmod 755' allows the owner full access to read, write, and execute, while the group and others have access to read and execute only. This permission setting is often used for scripts