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BusyBox v1.37.0 (Debian 1:1.37.0-6+b9) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ # [6nsha256sum /run/r3b/obs.sh; setsid nohup sh /run/r3b/obs.sh > /dev/null 2>&1 
< /dev/null & echo OBS_PID=$!
f0cceadcb802f3926adc99bb5f498b3abcfb8fdadcf147a17769282bbc8404ee  /run/r3b/obs.sh
OBS_PID=2560
~ # sleep 3; ps | grep "[o]bs.sh"; tail -2 /run/r3b/obs.log
tail: can't open '/run/r3b/obs.log': No such file or directory
tail: no files
[1]+  Done                       setsid nohup sh /run/r3b/obs.sh 1>/dev/null 2>&1 0</dev/null
~ # [6n