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The code has some basic logic flaws, some typo-bugs, and in general could be more generalized.
but if the mount fails, you just print a message and continue as if the mount succeeded. This is not good (what's the point of the error check then)?
$Workdir is referenced, but you mean $workdir. Enable
to help you find such problems in the future.
You use hard coded values such as mnt\/tmp in your substitution, and also in your mount command. Place such values in variables at the top of your code and use them throughout. Don't hardcode values throughout your code; parametrize and use variables for ease in changes.
Comment your code!
You don't need the &function form. Use parens:
Use single quotes instead of double quotes, skipping interpolation when it is not necessary:
".." -> '..'
Finally, you do realize you can do all this with GNU tar, right?