Startup Scripts
Scripts executed by init:
/etc/init.d/rcS (at startup)
/etc/init.d/rc (when changing run levels)
These two execute scripts in directories specific for different run levels located in the following directories: /etc/rcS.d /etc/rc0.d /etc/rc1.d /etc/rc2.d /etc/rc3.d /etc/rc4.d /etc/rc5.d /etc/rc6.d


ls /etc/rc6.d

 
K11cron   K20iptables    K79quotarpc  K89klogd     S31umountnfs.sh  S90reboot
K20dhcp   K20makedev     K85quota     K90sysklogd  S35networking
K20exim4  K20ssh         K86ppp       S20sendsigs  S36ifupdown
K20inetd  K25hwclock.sh  K89atd       S30urandom   S40umountfs

S - means "start"
K - means "kill" or "stop"
The number - means kill/start sequence number.

In this example, when system enters run level 6, the scripts are executed in the following order:
K11cron, K20dhcp, ... K90sysklogd followed by S20sendsigs, S30urandom, ... S90reboot

Manual start/stop:


/etc/rc6.d/K20ssh start
/etc/rc6.d/K20ssh stop

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