- Here scripts.
- Here symlink to /etc/init.d/ scripts. <N> - runlevel, <NN> - start order from low to high, with K run stop, with S run start.
To disable the service, rename the symbolic link so that its name begins with a K instead of with an S and its sequence number is 100 minus NN.
$ sudo service start $NAME $ sudo service stop $NAME $ sudo service restart $NAME $ sudo service force-reload $NAME
For Debian preferred package is sysvconfig(8).
See also bum(8) or update-rc.d(8) or sysv-rc-conf(8).