Re: [R] OT UNIX grep question

From: <francoisromain_at_free.fr>
Date: Fri 11 Aug 2006 - 06:25:55 EST

Selon Rolf Turner <rolf@erdos.math.unb.ca>:

> francoisromain@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!)
>

Hi,

Sorry for inconvenience, both are working on my fedora gnu/linux bash, Jan gave the explanation (Thanks!).

BTW, did you really think I didn't try the double quote call ? But do not hesitate if **you** see something **I** should learn.

Cheers,

Romain



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