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Redirecting STDERR message to STDOUT & file at same time

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# 1  
Old 04-09-2008
Redirecting STDERR message to STDOUT & file at same time
Friends
I have to redirect STDERR messages both to screen and also capture the same in a file.
2 > &1 | tee file works but it also displays the non error messages to file, while i only need error messages.
Can anyone help??
# 2  
Old 04-09-2008
Code:
prog 2 > | tee file

# 3  
Old 04-09-2008
it doesn't workSmilie
it neither print the ERROR messages on the screen nor on file
# 4  
Old 04-09-2008
Code:
prog 1>/dev/null | tee fil

Not tested ... Smilie
# 5  
Old 04-09-2008
no man. The requirement is this.

while running an application I have to print STDERR messages both on screen(STDOUT) and file at the same time while the normal STDOUT messages should be on screen only.
# 6  
Old 04-09-2008
Use this:
Script is "cmd"
Code:
#!/bin/sh
echo "This is Standard Out"
echo "This is Standard Error" >&2

Use cmd script like this:
Code:
((./cmd 3>&1 1>&2 2>&3) | tee /dev/tty) > err.log

The output is:
Code:
((./cmd 3>&1 1>&2 2>&3) | tee /dev/tty) > err.log
This is Standard Out
This is Standard Error

File err.log contains only stderr:
Code:
cat err.log
This is Standard Error

I think it's good now ! SmilieSmilie
# 7  
Old 04-09-2008
thanks man,
It works for most cases. But suppose if i give
cat nofile 3>&1 1>&2 2>&3) | tee /dev/tty > err.log


cat: cannot open nofile
is shown on screen only but not on err.log file

IS that not a STDERR msg
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