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An update of "cut" will overwrite your wrapper.
Much better: change your scripts. Run the following fix_cut script on your scripts:
#!/bin/sh
# fix_cut
PATH=/bin:/usr/bin...

The only way to make sure that your wrapper is always called instead of the OS supplied utility is to move the OS supplied utility to a different location and install your wrapper in the location...

The use of 0 is not according to specification. Alternatively, you can just omit it, which should work across versions
$ echo 0123456789abcdef | cut -c -8
01234567
If you cannot adjust the...