Shell Programming and Scripting

truss

strace

tusc -. trace UNIX system calls

Found after 5 seconds of heavy-duty Google use. "strace" and "truss" are tools used almost daily, "tusc" was news to me as i do not work on HP-Ux.

Google can be found at "www.google.com" with your favourite web browser.

Glad to be of help.

bakunin

i know dude, thanks
but HOW they can help me here?

They are very educational, and you can see exactly where it goes off the rails: where it gets the host, what host it is looking up, where it looks.

firebug in firefox shows me all this

firebug tells you what firefox is willing to tell you. These strace tools work at a deeper level.

hmm
i never used it for that
so what i should do then?

You can trace your server side, too.

I turn on lots of friendly options faelo wall rall xall for fork args, environment, threads, a trace file, i/o full data. You can either pick a running process with -p or put a command on the command line. Sometimes it gets cranky, so I do this:

Code:

$ (
 sleep 2
 run_test_command
)& strace -faelo /tmp/this.tr -rall -wall -p $!

You trace from the end of sleep 2, watch the shell fire up your command, and on. When the bg proc dies, strace exits. It works in reverse for interactive:

Code:

$ strace -faelo /tmp/this.tr -rall -wall -p $$ & 
$ run_test_command