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Top Forums Shell Programming and Scripting To check Blank Lines, Blank Records and Junk Characters in a File Post 302943385 by RudiC on Friday 8th of May 2015 04:19:02 AM
Old 05-08-2015
1) awk with default field separators would set NF to 0 for those lines. Alternatively, you could use the regex /^[ ]*$/ (space and <TAB>) to identify them.
2) You'll need to loop over all fields and check for the length of each.
3) "Something which is not understandable" can be very locale depending. All of your examples "¢'Á|äÃ" are very essential in languages other than (US) English or necessary for e.g. record/parameter delimiting.

Last edited by RudiC; 05-08-2015 at 05:28 AM..
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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