Nov 112018

If you use the Unix or Linux command-line, you may very well wonder about the origins of some of the “special” characters. One of those is tilde (~) which is expanded by the shell into “home” :-

✓ mike@Michelin» echo $HOME                        
✓ mike@Michelin» echo ~
✓ mike@Michelin» echo ~root

This doesn’t of course work in general; just in the shell.

But where did this usage originate?

As it turns out, it was the markings on the keyboard of the ADM3A terminal :-

If you used Unix in the late 1970s/1980s, you may very well have used the ADM3A terminal and it seems that those who added the tilde feature to the Unix shell were amongst the users.

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