tee and some commands
 

Hi chaps

Â*

Anyone noticed that tee doesn’t seem to log
the output from some commands to a log file?

Â*

I am using tee in a script on the following
line;

Â*Â*Â* ncftpput -u $ftp_user -p $ftp_pass -R
-m -v ftp.mydomain.local / $dest/archives/$1/ | tee -a
$out_file

Â*

Instead of logging to a log file via tee it
now outputs two copies of the FTP output to the console and
nothing to the log file.

Â*

Is there a way I can work around that or is
it a limitation in the ncftpput command do you think?

Â*

Olly



Â*



Hi,



This could depends from $out_file being equal to "-", then
accordingly to tee documention, the output file is also stdout, thus
achieving a duplication of output.



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Leo "TheHobbit" Cacciari
Aliae nationes servitutem pati possunt populi romani est propria libertas


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tee and some commands
 

On Tue, Mar 22, 2011 at 6:51 AM, Oliver Marshall
<Oliver.Marshall@g2support.com> wrote:
>
> Anyone noticed that tee doesn’t seem to log the output from some commands to
> a log file?
>
> I am using tee in a script on the following line;
>
> Â*Â*Â* ncftpput -u $ftp_user -p $ftp_pass -R -m -v ftp.mydomain.local /
> $dest/archives/$1/ | tee -a $out_file
>
> Instead of logging to a log file via tee it now outputs two copies of the
> FTP output to the console and nothing to the log file.
>
> Is there a way I can work around that or is it a limitation in the ncftpput
> command do you think?

What's $out_file and can the user calling tee write to it?

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tee and some commands
 

On Tue, Mar 22, 2011 at 3:51 AM, Oliver Marshall
<Oliver.Marshall@g2support.com> wrote:
> Is there a way I can work around that or is it a limitation in the ncftpput
> command do you think?

The tee command creates its copies from standard input, but you may be
seeing standard error from the previous commands in the pipeline. A
common fix with tools like tee is just to ensure that both standard
output and standard error from your command both go to the same file
descriptor. Hence:

foo 2>&1 | tee /tmp/bar

will pipe all output through tee, not just standard output. Give it a
try and see if that helps.

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tee and some commands
 

On Tue, 22 Mar 2011, Leo "TheHobbit" Cacciari wrote:

>
> Hi chaps
>
> Â*
>
> Anyone noticed that tee doesnʼt seem to log the output from some commands to a
> log file?
>
> Â*
>
> I am using tee in a script on the following line;
>
> Â*Â*Â* ncftpput -u $ftp_user -p $ftp_pass -R -m -v ftp.mydomain.local /
> $dest/archives/$1/ | tee -a $out_file

it's entirely possible that what's coming out of the previous
command is being sent to stderr, whereas only stdout is passed
through a pipe by default.

if you want both stdout and stderr to be processed by the pipe, use
the following:

blah blah 2>&1 | going here

the "2>&1" forces stderr to follow stdout, at which point both streams
go to the pipe.

rday

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