sort with a tab as separator

[Guy Harris]

>On a NeXT improved csh (and presumably on some other shells), the following
>works:

	...

>that is, the tab must be quoted twice: once with the backslash, and then with
>the ^V (control-V) to not substitute spaces.

"improved"?  Thanks, NeXT; thanks a lot.  The vanilla C shell doesn't
have this particular stupidity.  Is this a "tcsh"ism?  If so, whoever
maintains "tcsh" should seriously think about getting rid of it, 'cause
it's a crock.  "csh" is broken enough already without breaking it
further....