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how to print script output to screen and file

 
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# 1  
Old 04-16-2008
how to print script output to screen and file
Hi all,

I have a script that bulk loads thousands of lines of data. I need to log the output during the execution of the script.

I know I can redirect (">") the output to a file; however, I want the output going to both the screen and the log file.

I thought I could use pipe to pipe the output to a new file but its not working.

For example:
ksh LoadAll.sh > Load.log --> writes only to log
ksh LoadAll.sh | Load.log --> command error


anyone know how this can be done?


thanks
# 2  
Old 04-16-2008
Code:
LoadAll.sh 2>&1 | tee -a Load.log

# 3  
Old 04-16-2008
thanks...it worked great! Smilie
# 4  
Old 04-21-2008
vgersh99

I'm trying to understand the syntax of the command you posted. Can you explain the purpose of the 2>&1?


thank you
# 5  
Old 04-21-2008
The 2>&1 is redirecting stdErr to stdOut. This lets you also record any errors to your logfile as well.
# 6  
Old 01-15-2009
If I run the script from outside then it is working fine
like this, LoadAll.sh 2>&1 | tee -a Load.log

Now I am facing another problem here. Suppose I have a script test.sh
Code:
#!/bin/sh

exec 2>&1 | tee -a test.log
pwd

Now when I run the script like ./test.sh, output is coming to terminal but test.log file is getting created with 0 size.

Please reply if anybody has any suggestion for it.
Last edited by Yogesh Sawant; 05-26-2010 at 03:03 AM.. Reason: added code tags
# 7  
Old 01-15-2009
Outside of the script, all the script's io is piped to 'tee' and so it is only done the one time.

Inside the script you would have to pipe all your commands that might produce output to 'tee' to get your desired result.

Basically in the script you wrote, only the 'exec' command was piped to 'tee' and as a result only it's ouput was "written" to test.log, and therefore you have an empty file.

If you had piped 'pwd' to 'tee' instead you would have gotten output in your log file.
 
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