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From: dichter@chdasic.sps.mot.com (Carl Dichter)
Newsgroups: comp.unix.questions
Subject: Re: using tee program with tar output
Message-ID: <26850@adm.brl.mil>
Date: 10 May 91 14:42:26 GMT
Sender: news@adm.brl.mil
Lines: 29

This will work in bourne:

	$ tar cvf tarfile /tmp 2>&1 | tee tar.out

But there is one caveat (and it is really true in any shell):
errors will come out immediately and normal output is buffered,
therefore it is harder to determine where an error actually occured.
Look at the following runs:

	$   tar cvf $HOME/tarfile $HOME/tardir
	a /home/libra/carl/tardir/afile 1 blocks
	a /home/libra/carl/tardir/myfile 2 blocks
	a /home/libra/carl/tardir/okfile 2 blocks
	tar: /home/libra/carl/tardir/yourbadfile: Permission denied

	$ tar cvf $HOME/tarfile $HOME/tardir 2>&1 | tee $HOME/tar.out2
	tar: /home/libra/carl/tardir/yourbadfile: Permission denied
	a /home/libra/carl/tardir/afile 1 blocks
	a /home/libra/carl/tardir/myfile 2 blocks
	a /home/libra/carl/tardir/okfile 2 blocks

The tee'd version has the message in a misleading place.

Have fun.

Carl R. Dichter 
Staff Software Engineer/Scientist
Motorola ASIC Division
Chandler, AZ 85224