Pid doesn't print when executing commands

[tkoch96]

I'm referring to the function Mininet/node.py: cmd

When doing node.cmd(cmd, printPid=True), it doesn't print the PID. cmd is, for example, running another Python script. These are commands with the '&' appended, so that script continues to execute in the background.

Commenting out these lines:
if len( cmd ) > 0 and cmd[ -1 ] == '&': # print ^A{pid}\n so monitor() can set lastPid cmd += ' printf "\\001%d\\012" $! '

in node.py and changing the elif to if on the following line results in the desirable output for me.

[lantz]

Printing the pid is for the benefit of lastPid; if you want it yourself for something that is running in the background then you can just run 'echo $!'; I don't have time to look at it now, but I seem to recall that that check is in there for a reason like breaking lastPid and/or confusing sentinel/prompt detection.