nc command on shell is not working in background

srk2ola · 01-09-2013, 11:31 PM

hi all,

I have a sh script where I need to execute the nc command in the background (I need that nc still running after the script finish)

BUT Im seeing the nc command is executed but after a couple of seconds dissapear in the ps command

This is my script

Code:

#!/bin/sh
CURRENT_FILE="curfile.txt"
PID_FILE="file.pid"

> $CURRENT_FILE

java -jar javaApp.jar -file $CURRENT_FILE &
AV_PID=$!

nc -l 64001 >> $CURRENT_FILE &
NC_PID=$!

echo -e "$AV_PID \n $NC_PID" > $PID_FILE

Do you have ay idea why the nc is stopping working?
in the file.pid Im seeing both pids, but when I try the ps file, Im only seeing the pid of the javaApp.

Please help....

chrism01 · 01-10-2013, 01:59 AM

A quick look here http://linux.die.net/man/1/nc suggests you may need the -k option as well?

srk2ola · 01-10-2013, 06:34 PM

Thanks,

With -k option didn't work.

I found my solution moving to socat... replace the line

Code:

nc -l 64001 >> $CURRENT_FILE &

with

Code:

socat -u TCP-LISTEN:64001,keepalive,reuseaddr,rcvbuf=131071 STDOUT >> $CURRENT_FILE &

Thanks