How can I run an specific program or script
when a user logs in to my machine!??

Thanks in advance!

Place the program, with full path into the user's ~/.bash_profile file that is located in their home directory. This assumes the user is using Bash of course. You can also look at system wide config file /etc/profile but be weary of editing that if you don't know what's going on. As always, make a backup before "tinkering".

Cool

wht should i add in profile to start dhcpd and iptable routing scritp at startup??

I'm having the same problem sort of. I created a script to start when booting. I place the file in my "bin" directory. the script runs when I execute it: ./filename, but not when it boots.

troycus: I think your path hasn't been set yet? Try /usr/bin/yourfilename ?

Ricky: dhcpd and iptables aren't user-specific processes, but system-wide processes.
If I want something started at boot time that isn't listed in my DrakXServices handy tool app, I put it in /etc/rc.local
Note that this is not a very thorough approach: you might want to assign these processes with a specific runlevel, and then you want to (FIXME) put it somewhere in /etc/rcx.d, where x is the runlevel you want it assigned to.

Well I am not very used to linux but can you tell me wht the runlevel for??

I have seen run levels but don't know wht are they about?

Also I have installed dhcpd from source ie. not from rpm.. so i think i have to something manualy to make dhcpd appear in services.

i start dhpcd by just typing dhcpd at console..

I googled for you:

http://stalin.iodynamics.com/education/runlevel.html

If you just want to get the freakin' app started at boot time, here is your approach. But note, as I said: it's not the most thorough, I still need to learn runlevels

Find the path of dhcpd. (find / | grep -i "dhcpd") I'll use /sbin/dhcpd as an example.

Now add this to the end of your /etc/rc.local:

by saying:

# echo 'see_above_code' >> /etc/rc.local

(or just use your favorite text editor and cut 'n paste ..)

I always add a comment to lines I add, because my rc.local file is already stuffed with code from other people. That way I know what I added. Be sure to backup the file. You _can_ leave 'wuck', but you might as well change it

For future reference: as you might have seen, /etc/rc.local is executed every time you boot, no matter what runlevel your system boots.

NOTE: I don't think dhcpd will appear in the services list.

WEll thanks for your googling but I have already seen that link...

In order for me to run xmodmap at startup, I needed to add the line to my /etc/X11/Xsession file, although it should run from the $HOME/.kde(gnome, etc...)/.xsession (or .initrc, or autostart)

Just a guess though, I may not be understanding the question... g/l!

Well may be u r not getting the questionn..