Adding permissions #

In order to change permissions of a file we can use specific options with the chmod command.

Important options #

Example:

> ls -l
-r--rw----. 1 aaron family 49 Oct 27 14:41 family_dog.jpg

Here we can see aaron has only read permission, what if we want to change this to read and write permissions both, we will use it like this:

$ chmod u+w family_dog.jpg

and now if we do ls -l:

$ -rw-rw----. 1 aaron family 49 Oct 27 14:41 family_dog.jpg

Now we see user aaron has write permission to the file.

Removing permissions #

Just as like in adding permissions we used u+ or g+ we will use u- or g-:

Example:
Here we can see that we are removing write permission from the user:

$ chmod u-w family_dog.jpg

Now if we check by ls -l write permission is gone fromthe user:

$ -r--rw----. 1 aaron family 49 Oct 27 14:41 family_dog.jpg