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Shell Programming and Scripting
Cannot get to convert multiple spaces to one space
Post 302407792 by EAGL€ on Friday 26th of March 2010 12:20:45 PM
03-26-2010
Quote:
The AWK proposal should definitely not be used. The goal is to squeeze multiple spaces into one, but that AWK oneliner will delete all leading and trailing whitespace (even if it's just a single space). Worse, it will delete any tabs in the data.
A nitpick regarding the sed, \+ I believe is a gnu basic regular expression extension. In standardized basic regular expressions, a plus sign is an ordinary character and a backslash will not make it into a multiplier. Instead of x\+, it would be more portable to use either x\{1,\} or xx*
I vote for the tr solution
Cheers,
Alister
A nitpick regarding the sed, \+ I believe is a gnu basic regular expression extension. In standardized basic regular expressions, a plus sign is an ordinary character and a backslash will not make it into a multiplier. Instead of x\+, it would be more portable to use either x\{1,\} or xx*
I vote for the tr solution
Cheers,
Alister
After seing your comment i have tested my code below with leading and trailing spaces and/or with tabs again, fortunately it worked well in all of this cases
But good to remember that we can use "tr" too.
Code:
awk '{gsub(/[ ]+/," ")}1' FILE|
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LEARN ABOUT CENTOS
perl::critic::policy::codelayout::prohibithardtabs
Perl::Critic::Policy::CodeLayout::ProhibitHardTabs(3) User Contributed Perl Documentation Perl::Critic::Policy::CodeLayout::ProhibitHardTabs(3) NAME
Perl::Critic::Policy::CodeLayout::ProhibitHardTabs - Use spaces instead of tabs. AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Putting hard tabs in your source code (or POD) is one of the worst things you can do to your co-workers and colleagues, especially if those tabs are anywhere other than a leading position. Because various applications and devices represent tabs differently, they can cause you code to look vastly different to other people. Any decent editor can be configured to expand tabs into spaces. Perl::Tidy also does this for you. This Policy catches all tabs in your source code, including POD, quotes, and HEREDOCs. The contents of the "__DATA__" section are not examined. CONFIGURATION
Hard tabs in a string are always forbidden (use " " instead). But hard tabs in a leading position are allowed when they are used to indent code statements, "qw()" word lists, and regular expressions with the "/x" modifier. However, if you want to forbid all tabs everywhere, then add this to your .perlcriticrc file: [CodeLayout::ProhibitHardTabs] allow_leading_tabs = 0 NOTES
Beware that Perl::Critic may report the location of the string that contains the tab, not the actual location of the tab, so you may need to do some hunting. I'll try and fix this in the future. 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 2014-06-09 Perl::Critic::Policy::CodeLayout::ProhibitHardTabs(3)