Hi,
In a shell script, I would like to quietly execute a command which produces long outputs.

Basically, I've tried to use the > (redirection) operator but only parts of this command output were logged to the file. These parts are all the "echo" contained in the command I want to execute. This command contains calls to C programs producing output that is always visible in the terminal.

I also tried to play with stty but without any success. I thought maybe the -cread option was what I need but it seems not to be accessible on my platform (ubuntu)

So my question is simple : how can I completely stop the terminal output while executing my command?

seems like some of the stuff is also going to stderr.

you have already re-directed stdout to a file but now you need to re-direct stderr to stdout.

google(re-direct stderr) = http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html

Yes you're right!
So I just need to do :

$ command 2> logfile.txt

Thanks!

Using &> should get it all in one place.

2 options:

stdout & stderr in same file:
cmd >cmd.log 2>&1

separate files
cmd >cmd.log 2>cmd.err

your choice, but (1) is easier to debug usually.

you can also put it safely in the background with
nohup <above stuff> &

& - put in background
nohup - allow user to logout without process terminating

This one is what I really need.

Thanks !

Just to clarify this a bit, the first redirection (>cmd.log) redirects stdout (1) output ("normal things", like echos etc.) to the given file, and the second (2>&1) redirects stderr (2) to where ever stdout is going (&1 means "where 1 [stdout] goes"). For this to work properly in this case, stdout has to be redirected first, and stderr second (read: the one that is redirected with & is redirected second, to make it go right), because if it was done the other way around, stderr would go to terminal (where stdout usually goes) and stdout to the file; this is because the shell interprets these from left to right.

Hope it clarified it a bit. It's also possible to direct outputs to variables and then use those variables in shell scripts, for example. It's not difficult either, but slightly more complicated than "normal" redirecting. Usual sometimes, though!