How to add or remove a service from startup

FREQUENTLY ASKED QUESTIONS  (Linux)
Q: How to add or remove a service from startup? (Fedora,CentOS,Redhat)


Add a service to startup
[root@server ~#]chkconfig <service> on
[root@server ~#]chkconfig sshd on
[root@server ~#]chkconfig sshd on --level 35   (add to startup in runlevels 3 and 5)


Remove a service from startup
[root@server ~#]chkconfig <service> off
[root@server ~#]chkconfig sshd off
[root@server ~#]chkconfig sshd off --level 5   (remove from startup only in runlevel 5)


Display Startup status of services
[root@server ~#]chkconfig sshd --list      (List the startup status of sshd )  
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
(The output says, sshd is added to statup in 2, 3, 4, 5 run levels) 

List the startup status of all services
[root@server ~#]chkconfig --list             (List the startup status of all services) 

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