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I launch below process with & so as to keep it running in background after I close session : 

pi@raspberrypi2 ~ $ ./spark-1.3.0-bin-hadoop2.4/bin/spark-class org.apache.spark.deploy.worker.Worker -m 700M spark://192.168.192.22:7077 &
[1] 3538
pi@raspberrypi2 ~ $ Spark assembly has been built with Hive, including Datanucleus jars on classpath
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
15/04/04 19:35:47 INFO Worker: Registered signal handlers for [TERM, HUP, INT]
15/04/04 19:35:47 WARN Utils: Your hostname, raspberrypi2 resolves to a loopback address: 127.0.1.1; using 192.168.192.55 instead (on interface eth0)
15/04/04 19:35:47 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
^C
pi@raspberrypi2 ~ $ 15/04/04 19:35:51 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

But as can see, the output is just temporarily hidden from view and when I close session the process stops.

How to launch process on Raspbian and keep it running after I have closed PI session ?

I have tried installing screen but I'm unable to switch screens when content is logged to output ?

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1
  • Look at the nohup command.
    – joan
    Commented Apr 4, 2015 at 20:00

2 Answers 2

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8

This is actually a Linux general question as opposed to Pi specific ... but the answer is to use the nohup command. Read about it here:

http://linux.die.net/man/1/nohup

Basically run:

$ nohup <your command and parameters go here> &

Nohup traps the hangup signal which is sent when you disconnect your screen/terminal from the process.

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  • 1
    It is a general linux Q but if someone here has a decent quick answer, cool (+1). I'd recommend setsid over nohup but if the latter works don't worry.
    – goldilocks ♦
    Commented Apr 4, 2015 at 22:32
  • tmux is another option.
    – tarabyte
    Commented Apr 6, 2015 at 2:42
  • I prefer nohup as it's with raspbian by default, tmux isn't installed
    – Aidan Connelly
    Commented Jun 29, 2018 at 8:31
0

What do you mean you are unable to switch screens? Usually you start screen, run the program, disconnect with Ctrl+a d then close ssh. Then open ssh later and check on the program with screen -r or screen -ls if more than one is running.

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