>"Note that a negative offset must be separated from the [non-following]
>colon by at least one space to avoid being confused with the ':-'
>expansion,' since a negative offset can exist immediately beside a
>subsequent colon.

>Wiley

Note, incidentally, that it is not strictly true that a negative offset has
to be preceded by a space.  A zero will work as well.  And I think that is
clearer.  I.e., instead of:

# Print the last 2 characters of $HOME
$ echo ${HOME: -2}

You can do:

$ echo ${HOME:0-2}

Or even:

$ echo ${HOME:7-9}

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