How to redirect output of an already running process.

Question

Normally I would start a command like

longcommand &;

I know you can redirect it by doing something like

longcommand > /dev/null;

for instance to get rid of the output or

longcommand 2>&1 > output.log

to capture output.

But I sometimes forget, and was wondering if there is a way to capture or redirect after the fact.

longcommand
ctrl-z
bg 2>&1 > /dev/null

or something like that so I can continue using the terminal without messages popping up on the terminal.

Answer 1

Try this link: http://etbe.coker.com.au/2008/02/27/redirecting-output-from-a-running-process/

Answer 2

http://www.isi.edu/~yuri/dupx/