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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.

~ # [6nprintf 'trap "" HUP\nexec ping -c 600 -W 3 -I wwan0 77.88.8.8 > /tmp/b8d-pin
g.log 2>&1\n' > /tmp/b8d-ping.sh; setsid sh /tmp/b8d-ping.sh < /dev/null > /dev/
null 2>&1 &
~ # sleep 2; head -2 /tmp/b8d-ping.log
PING 77.88.8.8 (77.88.8.8): 56 data bytes
64 bytes from 77.88.8.8: seq=0 ttl=47 time=191.234 ms
[1]+  Done                       setsid sh /tmp/b8d-ping.sh 0</dev/null 1>/dev/null 2>&1
~ # [6n