Linux Shell Scripting Cookbook - Third Edition

How to do it...

In order to set permissions for files, we use the chmod command.

Assume that we need to set the permission, rwx rw- r-.

Set these permissions with chmod:

    $ chmod u=rwx g=rw o=r filename

The options used here are as follows:

• u: This specifies user permissions
• g: This specifies group permissions
• o: This specifies others permissions

Use + to add permission to a user, group, or others, and use - to remove the permissions.

Add the executable permission to a file, which has the permission, rwx rw- r-:

    $ chmod o+x filename

This command adds the x permission for others.

Add the executable permission to all permission categories, that is, for user, group, and others:

    $ chmod a+x filename

Here a means all.

In order to remove ...