Nonetheless, It appears convoluted and brittle to me. It will not work on Linux/FreeBSD/MacOS implementations which never help snooze infinity. This being mentioned, it is most likely the best userland Resolution at the moment.
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Unique ping instructions are carried out in another way throughout the varied Unixes. So you have to pay attention to your Variation.
Is the no-op command right away interruptible? This is fairly normally a need Even though you may not think about it up front.
Stéphane Chazelas' read through Answer will work on Mac OS X as well if a looking through fd receives opened on /dev/fd/one.
@waltinator I've just checked and "Quick Enhance"/Rapidly Startup was enabled by default. I've disabled it and rebooted the program to try booting from your USB once more and I'm nonetheless encountering precisely the same situation.
If you're looking for it, modemmanager is closely linked to networkmanager - I believe It truly is an extension to it Or perhaps part of the default package. On my systemd program I killed by symlinking /dev/null about the /etcetera/systemd/system modemmanager rule counterpart to /usr/share/systemd's default 1...
It's best to stay away from any doable clashes to begin with rather than blindly relying on obtain using some magic that just just isn't there. Your question in advance of your edit was a superb Answer, as it only failed to match the now renamed file in any respect.
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and then sent command echo "AT" > /dev/ttyUSB0 following that I always received never ever ending loop from cat /dev/ttyUSB0 similar to this:
peterhpeterh 94011 gold badge88 silver badges1818 bronze badges 1 Most Otherwise all of your fears are now resolved in other solutions right here. None of the current responses propose hectic loops.
@meuh will try out that future. To date monitor worked to stop the repeat habits, but it stops the serial product from getting the message. Closing the display terminal will allow the message by means of.
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slm's solution is great, but if you simply desire to promptly check no matter whether a number is alive (and reachable, and responding to ping) Then you can certainly use fping in lieu of ping. It pings the host(s), and waits a brief time for just a reaction. fping's exit code stories achievements or failure.