On Thu, Aug 10, 2006 at 08:51:36AM -0300, Rolf Turner wrote: > [EMAIL PROTECTED] 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!)
you're perfectly right about single quotes being the correct thing to use here, but not all shells are insisting on linguistic correctness the way [t]csh does. bash leaves constructs that it cannot expand as they are, so the variant with double quotes does work as expected with bash (although through a mechanism that might be unexpected by most). Best regards, Jan -- +- Jan T. Kim -------------------------------------------------------+ | email: [EMAIL PROTECTED] | | WWW: http://www.cmp.uea.ac.uk/people/jtk | *-----=< hierarchical systems are for files, not for humans >=-----* ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
