Command coproc in linux, allows peoples to create a new process in background and allows ones to send commands to it

It works very well from command line, but when I try to launch it in a shell script, nothing happens

Exp: I'm trying to anable scanning Bluetooth feature a a raspberry py

Form command line these commands work well
coproc sudo bluetoothctl
echo -e 'scan on' >&${COPROC[1]}

But ig I try to use them in a script like this

#!/bin/bash
coproc sudo bluetoothctl
echo -e 'scan on' >&${COPROC[1]}

the script does nothing
If someone can help

You've asked a follow-up question about this exact topic in the Programming forum on an old thread, https://www.linuxquestions.org/quest...ng-4175615328/

Please continue to use that question.

You can also refer to the bash links in my signature for some tips about how to debug bash scripts.