However, It appears convoluted and brittle to me. It won't work on Linux/FreeBSD/MacOS implementations which don't help rest infinity. This becoming mentioned, it is probably the very best userland solution in the intervening time.
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This could print the PID. Should you exit your prompt applying ctrl+d then the background occupation will not likely quit, and you can afterwards eliminate The task from any place utilizing kill PID
(the word immediately is essential here: you don't need to look forward to some rest interval to expire ahead of the process realizes it has been interrupted). Most answers on this site does not remedy this query.
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Do you think you're typing the message into your monitor window? If that's the case try out ending the line with Management-j or Management-d intsead of enter.
If you would like operate anything in an infinite loop like a daemon Then you definitely'd very best put check here it while in the track record
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and afterwards despatched command echo "AT" > /dev/ttyUSB0 after that I often acquired never ever ending loop from cat /dev/ttyUSB0 like this:
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How to help make that the article sliding down along the area axis though subsequent the rotation in the An additional object?
To kill the outer loop I usually increase a rest command and push CTRL-C some additional instances: whilst :; do LONGTIME_COMMAND; slumber 1; finished. You should recognize: the colon at the rear of even though is interpreded as Accurate, so this is an endless loop.
slm's reply is excellent, but if you only want to promptly Examine regardless of whether a bunch is alive (and reachable, and responding to ping) then you can use fping as an alternative to ping. It pings the host(s), and waits a brief time to get a response. fping's exit code experiences good results or failure.