Sudoers file modification

We can change sudo privileges to users groups and also can do lots of new commands aliases with /etc/sudoers file. you need to type the following command to open the file:

sudo visudo

This will open the file in the vi window, then we will write our necessary commands within the file. to add a root user with all permissions from all terminals type the following commands:

root ALL=(ALL) ALL

This means root user gains previleges of executing all commands from all terminals. We can set a user with the following specific previleges:

guest ALL=NOPASSWD: /usr/bin/

this means user guest has can execute commands for path /usr/bin without any password.

To make a command aliasing we can write the following command:

cmnd_alias apache_restart /etc/init.d/apache2 restart

Now we will have a command apache_restart which will perform the restart operation of apache.


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