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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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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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