Wayne Brown writes:

> For instance, ls -l is often mistyped as
> ls-l by people in a hurry who get a little fumble-fingered.  (I use this
> command quite often and avoid this problem by aliasing 'ls -l' as ll,
> which also saves me a few keystrokes.)

That one's common enough that it's actually a built-in hard link
under HP-UX (see 'man ll', and the inode count for /usr/bin/ll and ls).

--Glenn

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