nohup does nor work, am I doing something wrong?

[Bamsefar]

So I am trying to run a script all the time, it is a simple thing just checking if a mobile is connected to wifi. It works as long as I am online (with putty). Logout and it stops direct.

So I start with:

nohup /bin/sh /jffs/scripts/CheckIfHome2 &
​

Am I doing something wrong here or is nohup broken?

I'm using AC3200 with rMerlin 378.55.

 

[ASAT]

nohup didn't work for me either. The Entware-ng repository has an app called 'screen'. Setup Entware-ng, then:

opkg update
opkg install screen

Running Screen

Then, to use it, type...

screen sh

It will open another terminal instance. You can now start a process you want to be able to leave running and reconnect to later. For example, downloading something with get_iplayer.


Detach

To detach this terminal session, press

CTRL + A release, and then press D

Then you are back in the original terminal screen with the other one running detached in the background.


List all Instances

You can list all open screen instances and their status by typing…

screen -list

Reconnect

...and you can reconnect to an instance with...

screen -r

SOURCE: http://raspi.tv/2012/using-screen-with-raspberry-pi-to-avoid-leaving-ssh-sessions-open

 

[sfx2000]

screen is a good workaround, but nohup seems to be broken/missing in the default busybox implementation.

Alt approach would be to install the bash shell from entware, and then nohup should work fine...

 

[mstombs]

Call he script from a system script such as wan_start ... no need for nohup!

 

[jp3141]

nohup isn't working for me either -- RT-AC68U 380.63

I think it used to work about a year ago, but needed it again this week and it basically kills my process when I logout. I don't want to install opt ware or entware -- is there an alternative ?

 

[ColinTaylor]

As @mstombs said, create a system script, like services-start and call your script from there. If the script runs continuously (i.e. doesn't return to the calling script) just run it in background by appending "&".

https://github.com/RMerl/asuswrt-merlin/wiki/User-scripts

 

[jp3141]

As @mstombs said, create a system script, like services-start and call your script from there. If the script runs continuously (i.e. doesn't return to the calling script) just run it in background by appending "&".

https://github.com/RMerl/asuswrt-merlin/wiki/User-scripts

Thanks, but then how do I develop and debug my script without rebooting my router every time; it's a script that runs continuously.
Is there a reason why nohup is broken ?

 

[ColinTaylor]

Is there a reason why nohup is broken ?

I don't know. I use John's fork and nohup works fine.

 

[sfx2000]

I suppose one could get really weird and wrap the script in a loop...

while true; do thescript.sh; done​

 

[thelonelycoder]

I suppose one could get really weird and wrap the script in a loop...

while true; do thescript.sh; done​

Just loose the &, otherwise this would be kind of a perpetual "machine" ...

 

[jp3141]

I suppose one could get really weird and wrap the script in a loop...

while true; do thescript.sh; done​

That doesn't work either -- it quits when I logout from my ssh session.

 

[RASG]

instead of a script that runs continuously, set it to run every minute in the router's crontab.
use cru for that.

ramon@ac66u:/tmp/home/root# cru --help

Cron Utility
add:    cru a <unique id> <"min hour day month week command">
delete: cru d <unique id>
list:   cru l

now you can let your script run and exit, and check the exit status/code.
this will allow you to take actions based on the failure/success of your script.

 

[sfx2000]

Just loose the &, otherwise this would be kind of a perpetual "machine" ...

hehe...

 

[vrqq]

The nohup seems doesn't work but these way could do it:
Using this command in computer, no ssh login and my_custom_script.sh keep running in background:

ssh admin@192.168.1.1 "/jffs/my_custom_script.sh &"

Tested on Merlin 386.2_4

btw: this command can write log into webUI

logger -c -p user.info "my custom text"