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It must run a BASH shell for each child.

Don't think xargs works that way. Not a shell internal, can't run shell functions.

And this is a problem why?

Doesn't seem to work that way, and I can't imagine why it would. Why wouldn't all three execs get the exact same files? Does this actually happen? find doesn't run...

I take it this script would run automatically at intervals. Given that, I think you could make your approach work. I'd break the archiving and deleting into two steps, so you can bail in case of...

Since tar may be run multiple times, you need to use the append option, not the create option.

How about:

$ tar -rf archive.tar # Create empty tar file to append to

$ find testout -type f...

I still don't understand what that tar command is intended to do.

What filename is it supposed to create, and where?

>> /directory/backup/log/2.log is similarly handled by shell, not exec, but in this case probably does close to what you want, except it will capture all stdout, not just ls. This may not matter if...

What -exec tar -cvf * /something/ * does only depends on your current directory, because the *'s are evaluated by the shell before it is run. exec is not a shell and would not handle the *'s if you...