"problem is if I run this command from the server I get <pre>Usage: grep [OPTION]... PATTERN [FILE]... Try `grep --help' for more information." </pre> do a <pre>if (IS_NUM(ip_addr)){</pre> <pre>//is client </pre> <pre>}</pre> <pre>else {</pre> <pre>//is server </pre> <pre>} </pre> -------------------------------------------------------------------------------- On 5/2/06, Eric Harrison wrote: > Thus anything with ".0.0." in it will match "0.0". > > > This should work better for you: > > getent hosts | grep ^`echo $DISPLAY | sed -e 's/:/ /g'\ | awk '{print $1}'` | cut -f1 Thanks Eric, interesting and clear explanation. But sitting at the server this returns nothing. I need something. 127.0.0.1 works for me. Explained below. > > > BUT, this is all very convoluted. It has the feeling of approaching a problem > in the wrong way. What is the context of what you are working on? There may > be a cleaner solution. thanks to you and Jim giving me tips at LinuxFest I was able to speed up fl_teachertool amazingly. It's FAST now :) Using the -n like you suggested netstat -t -e -n | grep :6000 | sed -e 's/:/ /g' | awk '{print $9,$6}' | sort | uniq works perfect and like lightning compared to having a dns lookup for every line of output. So now I have ip's instead of hostnames of all clients. This is fine BUT I use the $DISPLAY env variable to omit the terminal machine a teacher (running fl_TT) is sitting at (for obvious reasons like logging yourself out) So I have to omit the teacher terminal by omitting the ip which matches the $DISPLAY. That's why 127.0.0.1 works. Since none of the terminals have this ip none are omitted (which is what I want when someone runs fl_TT from the server). This line cat /etc/hosts | grep `echo $DISPLAY | cut -d: -f1` | cut -f1 works when running fl_TT on a terminal but not properly if the teacher runs fl_TT on the server (as you noticed) Long story short. Basically I just need fl_teachertool to figure out the ip of the terminal which it's running on and if running on the server it needs to give me an ip which none of the terminals would have eg. 192.168.0.254 or 127.0.0.1 so no match to omit is found. The only method of determining the ip of the terminals I know of is to get the $DISPLAY var and find it's corresponding ip in /etc/hosts (since I can't assume ws222.ltsp is 192.168.0.222). If you know an easier way I'd love to hear it. Hope this is not as clear as mud. -- Robert Arkiletian Fl_TeacherTool http://fltk.org/links.php?V269 C++ GUI tutorial http://fltk.org/links.php?V19 _______________________________________________ K12OSN mailing list K12OSN@redhat.com https://www.redhat.com/mailman/listinfo/k12osn For more info see