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. 
How to suspend a process for a certain period of time?
shell;process;cron;signals
You can use word notation for more readability :kill -STOP <PID> # pausekill -CONT <PID> # continue workingCheck man 7 signal