Handling failed mount (media not connected)

[L Goodwin]

My backup script (sh) works fine except when the
backup drive (USB Flash drive) is not plugged in. I'm
using mount_msdosfs to mount the backup drive.

What is the best way to handle mount_msdosfs error?
If the drive is not mounted, I want to detect the
failure and execute error-handling code.

I tried executing it in a subshell, which works when
it FAILS, but not when it WORKS.
Also tried trap <mount command> 0, but it did not help.


       
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