Send command to already running process in shell script

Question

In bash how can I issue a command to a running process I just started?

For example;

# Start Bluez gatttool then Connect to bluetooth device 
gatttool -b $MAC -I
connect # send 'connect' to the gatttool process?

Currently my shell script doesn't get to the connect line because the gatttool process is running.

@mazs I need to send about 10 commands to gatttool. Would that still work? Could I send one long string with many different commands? — sazr
– sazr, Commented May 25, 2016 at 6:45
Not sure what commands do you want to execute, but it seems like you can use gatttool in non-interactive mode as well, that would be simpler than writing an expect script. Check here for example : humbug.in/2014/… — magor
– magor, Commented May 25, 2016 at 6:50
i've added the /expect tag to your question. click on it to search for other questions with that tag. — cas
– cas, Commented May 25, 2016 at 8:22

jesse_b · Accepted Answer · 2018-02-27 01:44:05Z

-2

This works!

you can try

echo "connect" | gatttool -b $MAC -I

Full credit to mazs.

jesse_b

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answered Feb 27, 2018 at 1:22

Mr-Ace

1

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