SUDO on Linux

cat /etc/passwd

test:x:500:500:test:/home/test:/bin/bash

[root@localhost ~]# cp /etc/sudoers
[root@localhost ~]# cp /etc/sudoers /etc/sudoers.org

1) Full Permission to User
# User privilege specification
test ALL=(ALL) ALL

Let restart apache with out sudo

[test@localhost ~]$ /etc/init.d/httpd restart
rm: cannot remove `/var/run/httpd/httpd.pid’: Permission denied

test@localhost ~]$ sudo /etc/init.d/httpd restart
[sudo] password for test:
Stopping httpd: [ OK ]

sudo vi /etc/httpd/conf/httpd.conf

2) Limited Permission to User
Let restrict to apache stop,start restart

test ALL=(ALL) /etc/init.d/httpd

3)Full permission to a user with No password

test ALL=(ALL) NOPASSWD:ALL

[test@localhost ~]$ sudo /etc/init.d/vsftpd restart
Shutting down vsftpd: [FAILED]
Starting vsftpd for vsftpd: [ OK ]

4) All Permission to Group
# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

5) Limited Permission to Group
# Members of the admin group may gain root privileges
%admin ALL=(ALL) /etc/init.d/ssh

6) All Permission to Group with No Password
# Members of the admin group may gain root privileges
%admin ALL=(ALL) NOPASSWD:ALL

7)Give Limited Permission to Group with No Password
# Members of the admin group may gain root privileges
%admin ALL=(ALL) NOPASSWD:/etc/init.d/ssh