tcl script capture on a txt file

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hello I'm novice in the use of the tcl script.

does anyone know how can I capture on a txt file the output coming from the schell following the script?

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I don't see how this has anything to do with a Tcl script. It sounds like what you want is to capture the output from a program, that just happens to accept a Tcl script on the command line. In that case, just use the shell:

For example, here's a program that generates output:

dwh@kiwi ~
$ quartus_stp
Quartus II SignalTap II
Version 9.0 Build 184 04/29/2009 Service Pack 1 SJ Web Edition
Copyright (C) 1991-2009 Altera Corporation
Usage:
------
quartus_stp  | -v]
quartus_stp <project name> 
quartus_stp -t <script file> 
quartus_stp -s
quartus_stp --tcl_eval <tcl command>

and here's that output redirected to a file

dwh@kiwi ~
$ quartus_stp  > tmp.txt

Cheers,

Dave