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How can file permissions be set in unix?

The command to change file permissions in unix is ‘chmod’ or also known as the change mode. With this command the user can set the permissions for users on how to access a file and what can be done with it.


The syntax for changing file permissions is:



The "who" can be referred to:

- u : This is for the user who owns the file.
- g: This is meant to apply to the group which owns this file.
- o: This is used to specify the permissions for the rest of the users.
- a: This is used to specify everyone and anyone.

The +/- sign refer to if the permissions are to added or removed. The new permissions can be used in form of characters (r for read , x for execute) etc.

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