bash scripts creating log files

bash scripts creating log files

[Paul Furness]

Hi, everyone.

I'm trying to write a bash script which is basically a wrapper around a
number of other commands.

What I _want_ to do is basically _copy_ stdout and stderr to a log file.

Thus, when I run a command, I wans the stdout and stderr to go to
wherever called the script (eg an interactive terminal) but I _also_
want it to go to a log file.

I can do it easily for things I'm echoing in my own script by writing a
function like this:


	function ECHO
	{
	    echo $1
	    echo $1 >> ${Logfile}
	}

and then any messages which I generate I use ECHO instead of echo:

	ECHO "This is a message"

What I can't figure out is how do I redirect the output of the things
I'm running to the same 2 places?

Anyone know a nice easy way to do this?

Tnx.

Paul.




-- 
Paul Furness

Systems Manager

2+2=5 for extremely large values of 2.

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Exporting display

[Abhijit Vijay]

Hi Everyone,

I connect to a Linux machine using SSH from a Windows
NT workstation and need to bring up graphical programs
on my console. I find that I am unable to do this...
Could anyone please tell me what I should do?

Here's what I did...

1. Run XWin on my workstation. This shows up on my
system tray

2. Execute "setenv DISPLAY ${REMOTEHOST}:0.0" after
connecting to my linux machine through SSH

3. echo $REMOTEHOST gives me hughes08.biac.duke.edu
(my Windows NT workstation)

4. echo $DISPLAY gives me hughes08.biac.duke.edu:0.0

However, when I type xbiff& after connecting to my
linux machine, I just get the process ID. The xbiff
window does not show up!

Regards,
Abhijit.

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Re: Exporting display

[Kenneth Stephen]

On Tue, 17 Sep 2002, Abhijit Vijay wrote:

> 
> 2. Execute "setenv DISPLAY ${REMOTEHOST}:0.0" after
> connecting to my linux machine through SSH
> 
> 3. echo $REMOTEHOST gives me hughes08.biac.duke.edu
> (my Windows NT workstation)
> 
> 4. echo $DISPLAY gives me hughes08.biac.duke.edu:0.0
> 
> However, when I type xbiff& after connecting to my
> linux machine, I just get the process ID. The xbiff
> window does not show up!
> 

Abhijit,

	Did you try running it in the foreground first (without the
'&')? Some applications require a terminal to work atleast during
initialization and putting it in background mode may just stop the
process. The other thing to check for is whether your .xsession-errors
file shows any error messages. If it shows access denied type messages,
perhap you need to run xhost or an equivalent program on your NT machine.

Regards,
Kenneth

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Re: bash scripts creating log files

[Jos Lemmerling]

On 17 Sep 2002, Paul Furness wrote:

> What I _want_ to do is basically _copy_ stdout and stderr to a log file.
> 
> Thus, when I run a command, I wans the stdout and stderr to go to
> wherever called the script (eg an interactive terminal) but I _also_
> want it to go to a log file.
> 
> I can do it easily for things I'm echoing in my own script by writing a
> function like this:
> 
> 
> 	function ECHO
> 	{
> 	    echo $1
> 	    echo $1 >> ${Logfile}
> 	}
> 
> and then any messages which I generate I use ECHO instead of echo:
> 
> 	ECHO "This is a message"
> 
> What I can't figure out is how do I redirect the output of the things
> I'm running to the same 2 places?

"tee" is your friend:

echo test | tee -a logfile.txt

test is printed to the screen and appended to the file "logfile.txt". If
you don't use the "-a" the file is overwritten every time.

HTH


--
Jos Lemmerling on Debian GNU/Linux			jos(@)lemmerling(.net)

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Re: bash scripts creating log files

[Carl]

At 12:15 17/09/2002 +0100, Paul Furness wrote:
>Hi, everyone.
>
>I'm trying to write a bash script which is basically a wrapper around a
>number of other commands.
>
>What I _want_ to do is basically _copy_ stdout and stderr to a log file.
>
>Thus, when I run a command, I wans the stdout and stderr to go to
>wherever called the script (eg an interactive terminal) but I _also_
>want it to go to a log file.
>
>I can do it easily for things I'm echoing in my own script by writing a
>function like this:
>
>
>        function ECHO
>        {
>            echo $1
>            echo $1 >> ${Logfile}
>        }
>
>and then any messages which I generate I use ECHO instead of echo:
>
>        ECHO "This is a message"
>
>What I can't figure out is how do I redirect the output of the things
>I'm running to the same 2 places?

There is a command called "tee" which will pipe data to a file and stdout/stderr at the same time

you do:

         someprog | tee /tmp/some.log.file

The output of someprog is sent to stdout/stderr and the file /tmp/some.log.file

You can then do what you like with stdout/stderr as normal.

tee should be installed as it comes with sh-utils package.

--
Carl

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Re: bash scripts creating log files

[Paul Furness]

Everyone, 

Thanks for your help. Tee is exactly what I needed, and works perfectly.

P.




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