如何在VM上无限期运行Shell脚本？

Question

I have a VM that I want running indefinitely. The server is always running but I want the script to keep running after I log out. How would I go about doing so? Creating a cron job?

Answer 1

In general the following steps are sufficient to convince most Unix shells that the process you're launching should not depend on the continued existence of the shell:

• run the command under nohup
• run the command in the background
• redirect all file descriptors that normally point to the terminal to other locations

So, if you want to run command-name , you should do it like so:

nohup command-name >/dev/null 2>/dev/null </dev/null &

This tells the process that will execute command-name to send all stdout and stderr to nowhere (instead of to your terminal) and also to read stdin from nowhere (instead of from your terminal). Of course if you actually have locations to write to/read from, you can certainly use those instead -- anything except the terminal is fine:

nohup command-name >outputFile 2>errorFile <inputFile &

See also the answer in Petur's comment, which discusses this issue a fair bit.