[R] OT UNIX grep question

Rolf Turner rolf at erdos.math.unb.ca
Thu Aug 10 13:51:36 CEST 2006

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!)


				Rolf Turner
				rolf at math.unb.ca

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