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I have several running processes which is started by a shell, but I don't want them to run during 08:00am - 20:00pm for each day because they are really bandwidth-consuming, so , I have to suspend them during that period of time instead of killing them directly because killing them will cause some problems.So , my work ,is to suspending them at 08:00am and waking them up at 20:00pm every day.Anyone can tell my how to do that ? I tried to do this in crontab, I use kill -19 pid to suspend them but I don't know how to wake them up by pid number.

Maybe a shell script will be quite appreciated.Thank you.

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You can use word notation for more readability :

kill -STOP <PID> # pause
kill -CONT <PID> # continue working

Check

man 7 signal

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