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Full Discussion: Grepping Words with No Vowels
Top Forums UNIX for Dummies Questions & Answers Grepping Words with No Vowels Post 302772681 by sudon't on Tuesday 26th of February 2013 12:39:39 PM
Old 02-26-2013
Grepping Words with No Vowels
Hi!
I was trying to grep all the words in a wordlist, (twl), with no vowels. I had a hard time figuring out how to do it, but I finally lit on the -v flag. Here's my question:
Why does this work:
Code:
grep -v '[aeiou]' twl

But this doesn't:
Code:
grep '[^aeiou]' twl

In the second example, we're asking for lines which do not contain that class of letters, in this case the vowels, right? To my mind, it should come out the same. Clearly I'm missing something fundamental.
 

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LEARN ABOUT PLAN9

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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