All are interruptible in a way or A further. At least among the prevailing solutions previously provides an implementation of pause. Even your advised implementation of rest infinity is more than-complicated as sleep by itself is presently interruptible

How can I make my looping shell script pause following a loop by sending anything like ctrl-z then be continuable? one

Provided that $COMMAND terminates successfully, It will probably be operate once again. If it fails or is terminated by sign, the loop will end.

2 Looks like the modem is echoing the command back to you personally (envisioned) but then the tty port is sending the command again towards the modem and generating your endless loop. Attempt: stty -echo to stop the port from echoing the instructions back again for the modem.

and this loop hardly ever ends. On Home windows all is effective just fine. I am able to connect with USB modem by way of Digital COM port and send out command / get reply.

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It seems that what I want is to pipe into system a thing which won't do anything at all for an indefinite amount of time and would not browse stdin. The next ways operate:

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after which you can despatched command echo "AT" > /dev/ttyUSB0 following that I usually bought hardly ever ending loop from cat /dev/ttyUSB0 like this:

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Attempted various huawei USB modems, and distinct stty get more info settings and likewise default configurations for huawei modems:

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slm's answer is great, but if you just wish to immediately check whether or not a number is alive (and reachable, and responding to ping) Then you can certainly use fping in place of ping. It pings the host(s), and waits a short time for the response. fping's exit code studies good results or failure.