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From: ram on 24 Jun 2008 20:40
Hi All,
I am running tcl version 8.4.x in a windows machine and i am
trying to use the log_file command. It dose not seem to be working.
The sample code is as below

#! /bin/sh
# -*- tcl -*- \
exec tclsh "$0" ${1+"$@"}

# This is required to declare that we will use Expect
package require Expect

# Debugging commands used to see execution
exp_internal -f rep.txt 0
set exp::winnt_debug 1

spawn cmd
log_file -noappend ex3.txt
send "ipconfig\r"
log_file

So the file ex3.txt is created but it is empty. I would have
expected it to have the output of ipconfig. Please advice as to what i
am missing.

thanks,
Ram
From: Cameron Laird on 27 Jun 2008 09:59
In article <af14f60f-c35c-4995-a52c-4b30f5bb1091(a)v1g2000pra.googlegroups.com>,
ram <ramjothikumar(a)yahoo.com> wrote:
>Hi All,
> I am running tcl version 8.4.x in a windows machine and i am
>trying to use the log_file command. It dose not seem to be working.
>The sample code is as below
>
>#! /bin/sh
># -*- tcl -*- \
>exec tclsh "$0" ${1+"$@"}
>
># This is required to declare that we will use Expect
>package require Expect
>
># Debugging commands used to see execution
>exp_internal -f rep.txt 0
>set exp::winnt_debug 1
>
>spawn cmd
>log_file -noappend ex3.txt
>send "ipconfig\r"
>log_file
>
> So the file ex3.txt is created but it is empty. I would have
>expected it to have the output of ipconfig. Please advice as to what i
>am missing.
.
.
.
We need a page to explain the general phenomenon here; it
is sooooooo common.

Let's go about things this way: when your Expect script
does NOT use [log_file], do you see the ipconfig(1) result
you expect on the screen? I think the answer will be, "No".
[log_file] only logs what there is to be displayed, and if
there's nothing to display ...

The crucial fact that even so many moderately-experienced
Expect users miss is that Expect operates in terms of
dialogues: as the programmer, you not only have to [send],
but also to [expect], in order to see any results.

Does <URL: http://wiki.tcl.tk/2958 > give you everything
you want?

If I understand your description correctly, you might be
able to reduce all that programming to a single line.
Please experiment with

# Warning: this is not a style recommended for production.
puts [open ex3.txt w] [exec ipconfig]

and let us know how it works for you.
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