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redirecting stdout and stderr to a file

Hi

I'm trying to write a script and at the same time log all errors to a file.
I've noticed that in configure scripts they use this:

Code:

exec 5>config.log

echo 'stuff to log' >&5

but this only logs stdout to config.log. I want to append both stdout and stderr.

Code:

&> file.log

redirects both stderr and stdout but overwrites the files old contents.
Again this is not what I want.

So how do I go about redirecting both stdout and stderr to a file but appending to the files last contents?

Thanks.
Avatar

Code:

2>&1 | tee -a file.log

blah blah >> mylog 2>> mylog

Code:

>> file.log 2>&1

Thanks, much appreciated.