Does nohup work across a pipe?

Question

If I do

nohup cmd1 | cmd2 &

is that the same as

nohup "cmd1 | cmd2" &

?

I would like that I nohup everything, as cmd1 will listen on port 8023.

Answer 1

No, you need to add the nohup to the commands separately.

Something like this is recommended:

nohup sh -c "cmd1 | cmd2" & 

Or alternatively:

nohup $SHELL <<EOF & cmd1 | cmd2 EOF 

Answer 2

As an alternative to nohup, I recommend

( cmd1 | cmd2 ) > logfile < /dev/null 2>&1 & 

By rerouting stdin, stdout, and sterr from the terminal, this achieves much the same effect as nohup with a syntax that I, at least, prefer.

Answer 3

You always can create a script file and run it with nohup:

echo "cmd1 | cmd2" > nohupScript.sh
nohup nohupScript.sh &

Answer 4

You could start your pipe in a screen session. Keystroke Ctrl-a and then d will detach the screen session from your terminal. You can then safely exit your terminal; the pipe will continue to run. Use screen -r to reconnect to the session again.