How do I run a script in the background?

Use nohup! Here’s an example:
nohup /some/script.ksh

And even better, to redirect all output to a specific location:
nohup /home/user/script.ksh > /home/user/script.log 2>&1 &

Yes, the 2>&1 & at the end is important.

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Disclaimer: Thoughts and opinions are my own, and do not reflect the views of any employer, family member, friend, or anyone else. Some links may be affiliate links, but I do not link to anything I do not use myself.