This article mainly shares with you the relevant content of shell scripts to implement multi-process operation. It is shared for your reference and learning. Let’s take a look at the detailed introduction together:
example
for ip in 192.168.56.{1..254}
do
(
ping $ip -c 4 &>/dev/null;
if [ $? -eq 0 ]; then
echo $ip is alive
fi
) &
done
wait
explain
The key point is () and &, and the commands that need to be executed in for are used as a combination and run in the background.
wait for all background subroutines to be executed
Execution efficiency
Use time to view the running time. I don't need to say much about this efficiency.
time bash 192.168.56.101 is alive 192.168.56.1 is alive 192.168.56.102 is alive 192.168.56.103 is alive real 0m13.164s user 0m0.157s sys 0m1.160s
Summarize
The above is the entire content of this article. I hope the content of this article will be of some help to your study or work. If you have any questions, you can leave a message to communicate. Thank you for your support.