10-27-2006
delete string in a text file leaving the first occurrence
Hi,
How can i delete the second and subsequent occurrence of a particular string from a file ?
eg) test.txt
cattle
bat
battle
mat
matter
cattle
cattle
my output file should be
cattle
bat
battle
mat
matter
I am new to unix and your advice is greatly appreciated.
Thanks in advance,
gops
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LEARN ABOUT CENTOS
ppix::regexp::token::quantifier
PPIx::Regexp::Token::Quantifier(3) User Contributed Perl Documentation PPIx::Regexp::Token::Quantifier(3)
NAME
PPIx::Regexp::Token::Quantifier - Represent an atomic quantifier.
SYNOPSIS
use PPIx::Regexp::Dumper;
PPIx::Regexp::Dumper->new( 'qr{w+}smx' )
->print();
INHERITANCE
"PPIx::Regexp::Token::Quantifier" is a PPIx::Regexp::Token.
"PPIx::Regexp::Token::Quantifier" has no descendants.
DESCRIPTION
This class represents an atomic quantifier; that is, one of the characters "*", "+", or "?".
METHODS
This class provides the following public methods. Methods not documented here are private, and unsupported in the sense that the author
reserves the right to change or remove them without notice.
could_be_quantifier
PPIx::Regexp::Token::Quantifier->could_be_quantifier( '*' );
This method returns true if the given string could be a quantifier; that is, if it is '*', '+', or '?'.
SUPPORT
Support is by the author. Please file bug reports at <http://rt.cpan.org>, or in electronic mail to the author.
AUTHOR
Thomas R. Wyant, III wyant at cpan dot org
COPYRIGHT AND LICENSE
Copyright (C) 2009-2013 by Thomas R. Wyant, III
This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full
text of the licenses in the directory LICENSES.
This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.
perl v5.16.3 2014-06-10 PPIx::Regexp::Token::Quantifier(3)