Michael writes:
> First, two examples:
>
> ^I
> ^M
>
> Obviously, you know that these are each single characters, and not two:
> caret+letter.
>
> Where do these come from? Are they features of the shell?
They're simply adjustments to the output for the rendering of
non-visual ASCII characters for the sake of the person sitting behind
the console. They're features of the terminal; see stty(5),
specifically:
* [-]ctlecho
echo control characters in hat notation (`^c')
> Where is an exhaustive list of such special control characters, and
> their definitions?
$ apt-get install ascii
$ ascii
for starters although if you're extremely interested in this you may
want to investigate the origins of encoding standards used in early
serial communications.
http://www.staubassociates.com/dbase/bu07sh.htm
> They come in quite handy for shell scripts, and I'm sure there are
> those about which I do not know, that can make life easier.
>
> What do you think?
It has its place.
Elizabeth
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