Well, maybe it's not my favorite, but it's probably the history substitution
I use most often. It's especially handy if you have fumble-fingers on a strange
cat: myflie: No such file or directory
Obviously, this doesn't save much typing for a short command, but it can sure be
handy with a long one.
I also use
to recall an
earlier command so I can change it. For example:
The point is sometimes not to save typing, but to save the effort of
remembering. For example, I want to print the file I looked at earlier,
but don't remember the exact name...
[My keyboard can repeat characters when I'm not expecting it.
I use a single
to delete extra characters.
lpr: sources/aproggg.c: no such file or directory
You could type
, but the second caret isn't required.
With a single caret, you don't type a replacement string - just the
string to delete.