On Wed, 2003-07-23 at 15:32, Vij Chau wrote: > Guys, > > Simple Question. Help appreciated. > > Right now, everytime i start my computer i type "ettercap -sNzC &" in the > shell and forget it. > Once in a while, i check the logs. > > How do I automate this at startup? You can put it at the end of /etc/rc.sysinit rc.sysinit gets executed once per boot essentially. rc.local gets executed at every runlevel change. A second choice is to make a custom script in /etc/init.d (but you have to follow a certain form -- see the other init scripts), and then configure the runlevel to activate that script. Personally, I'd go with /etc/rc.sysinit. Essentially, this is how the boot works: kernel loads the initial ram disk and runs linuxrc from within this. The linuxrc file is usually a script and it loads modules and sets up all things to access the root file system. Then it mounts the filesystem and sets the root file system to be the new system root. Then the kernel unloads the ramdisk and looks for /sbin/init and executes this, which is the mother of all processes (quite literally). What follows now, is redhat specific: First init processes /etc/inittab and sets up virtual terminals and things. If you check /etc/initttab, you'll see that one of the first things it does (regardless of the runlevel parameter the kernel passed it) is to execute rc.sysinit: # System initialization. si::sysinit:/etc/rc.d/rc.sysinit Once that is complete, then it executes /etc/rc.d/rc #, where # is the desired runlevel. rc runs /etc/rc.local and then causes the init.d scripts to be run, as appropriate and as configured by you for that runlevel. (See /etc/rc[123456].d/*) Once that is done, init sets up the gettys (which gives you the login prompt) on tty1-6. Finally, if you are in runlevel 5, init will launch /etc/X11/prefdm -nodaemon, which fires up X and your login manager. Other lines in inittab specify handlers for events, like powerfail, ctrlaltdel, etc. Just comment out the ctrlaltdel line, for example, and you can prevent users from rebooting, although there is a better way which is to add '-a' to the shutdown command which only allows rebooting if the root user is logged into th console. Finally a tip: If you move one of the mingetty lines up to right after the rc.sysinit line, then you can have a login prompt on one of the ttys even before the system has completely booted (it will appear after init finishes rc.sysinit, which is when the "Entering Runlevel #" messag appears). This is handy for logging in if one of th init.d scripts hangs, like network startup or something. RedHat follows the System V style of init. Debian is similar but different, especially in how X is treated. Gentoo is also different. This is a long explaination, but understanding the boot process can really help you know how and where to do things such as what you asked about. Michael > > Thanks in advance > -N -- Michael Torrie <torriem@xxxxxxxxxxxx> -- Shrike-list mailing list Shrike-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/shrike-list
