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Full Discussion: doubt regardin regex in grep
Top Forums Shell Programming and Scripting doubt regardin regex in grep Post 302231409 by bwreed on Tuesday 2nd of September 2008 09:02:24 AM
Old 09-02-2008
I know this is an old question, but here's an old answer to match. (It's old because I'm sure the grep command hasn't changed).
[^C] matches any character that's NOT a C.
You might want
$ grep -E "^[^C]*$" test
or more likely, you want
$ grep -vE "[C]" test
 

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LEARN ABOUT POSIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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