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Full Discussion: Remove space with sed
Top Forums UNIX for Beginners Questions & Answers Remove space with sed Post 303037322 by Don Cragun on Monday 29th of July 2019 06:41:23 PM
Old 07-29-2019
Hi arm,
Please be very careful when posting your code. When I tried to run your script with the data you supplied, the output I got was:
Code:
United

(Note that there is a space at the end of that output. The BRE that you supplied to your first sed has two spaces after the asterisk and there aren't any occurrences of two adjacent spaces in your sample input. So I don't see how the code you showed us could have produced the output you showed us.

Assuming that there is no more than one occurrence of that field in an input line, one might also try:
Code:
awk '
match($0, /dstcountry="[^"]*"/) {
        $0 = substr($0, RSTART + 12, RLENGTH - 13)
        gsub(" ", "")
        print
}' myfile

which might be a little bit faster since it doesn't have to process dozens of fields that don't match.

Note also that using cat and sed as input and output filters for awk is almost always a waste of system resources that will slow down your script and may also delay other things running on your system while your script is running.
This User Gave Thanks to Don Cragun For This Post:
Neo
 

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LEARN ABOUT CENTOS

perl::critic::policy::regularexpressions::requirelineboundarymat

Perl::Critic::Policy::RegularExpressions::RequireLineBouUseryContributed PPerl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3)

NAME

       Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching - Always use the "/m" modifier with regular expressions.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Folks coming from a "sed" or "awk" background tend to assume that '$' and '^' match the beginning and end of the line, rather than then
       beginning and end of the string.  Adding the '/m' flag to your regex makes it behave as most people expect it should.

	   my $match = m{ ^ $pattern $ }x;  #not ok
	   my $match = m{ ^ $pattern $ }xm; #ok

CONFIGURATION

       This Policy is not configurable except for the standard options.

NOTES

       For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regexp::Common module.  Also, be
       cautions about slapping modifier flags onto existing regular expressions, as they can drastically alter their meaning.  See
       <http://www.perlmonks.org/?node_id=484238> for an interesting discussion on the effects of blindly modifying regular expression flags.

AUTHOR

       Jeffrey Ryan Thalhammer	<jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.16.3							    2014-0Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3)
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