[R] OT UNIX grep question

[Rolf Turner]

francoisromain at free.fr wrote:

> You have to learn about regular expressions. Then you'll come up with
> something like :
> 
> grep "^dog$" /usr/share/dict/words

*You* have to learn about shell syntax.  The foregoing doesn't
work; it gives an ``Illegal variable name.'' error.  To protect
against the shell interpretation of the dollar sign you have
to use *single* quotes.

		grep '^dog$' /usr/share/dict/words

*does* work.  (Try it!)

			cheers,

				Rolf Turner
				rolf at math.unb.ca