How to run a command in the background and get no output?

Question

I wrote two shell scripts a.sh and b.sh. In a.sh and b.sh I have a infinite for loop and they print some output to the te

Answer 1

If they are in the same directory as your script that contains:

./a.sh > /dev/null 2>&1 &
./b.sh > /dev/null 2>&1 &

The & at the end is what makes your script run in the background.

The > /dev/null 2>&1 part is not necessary - it redirects the stdout and stderr streams so you don't have to see them on the terminal, which you may want to do for noisy scripts with lots of output.