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Top Forums Shell Programming and Scripting Extended ASCII Characters keep on getting reintroduced to text files Post 302976966 by lewk on Saturday 9th of July 2016 12:57:57 PM
Old 07-09-2016
Extended ASCII Characters keep on getting reintroduced to text files

I am working with a log file that I am trying to clean up by removing non-English ASCII characters. I am using Bash via Cygwin on Windows.

Before I start I set:
Code:
export LC_ALL=C

I clean it up by removing all non-English ASCII characters with the following command;
Code:
grep -v $'[^\t\r -~]' filename_01.csv > filename_02.csv

I then check whether there is any non-English ASCII characters left with the following command and it returns nothing, indicating that there is no non-English ASCII characters left.

Code:
perl -ane '{ if(m/[[:^ascii:]]/) { print  } }' filename_02.csv

I then deleted the first line with the following command;
Code:
tail -n +2 filename_02.csv > filename_03.csv

When I check filename_03.csv again for non-English characters it returns quite a few lines with non-English ASCII characters Smilie Why is this happening, what am I doing wrong? It somehow got reintroduced when I ran the tail command, how is this possible?

Code:
perl -ane '{ if(m/[[:^ascii:]]/) { print  } }' filename_03.csv

Example of the characters that got introduced back into my text file after I ran the tail command that I initially cleaned.

Code:
▒▒Gateway1,Gateway2 ▒▒4▒d▒U4▒'E"▒morel

 

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Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME
Locale::Codes::LangFam - standard codes for language extension identification SYNOPSIS
use Locale::Codes::LangFam; $lext = code2langfam('apa'); # $lext gets 'Apache languages' $code = langfam2code('Apache languages'); # $code gets 'apa' @codes = all_langfam_codes(); @names = all_langfam_names(); DESCRIPTION
The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in ISO 639-5. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5 language family codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $lext = code2langfam('apa','alpha'); $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA); The codesets currently supported are: alpha This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages. This is the default code set. ROUTINES
code2langfam ( CODE [,CODESET] ) langfam2code ( NAME [,CODESET] ) langfam_code2code ( CODE ,CODESET ,CODESET2 ) all_langfam_codes ( [CODESET] ) all_langfam_names ( [CODESET] ) Locale::Codes::LangFam::rename_langfam ( CODE ,NEW_NAME [,CODESET] ) Locale::Codes::LangFam::add_langfam ( CODE ,NAME [,CODESET] ) Locale::Codes::LangFam::delete_langfam ( CODE [,CODESET] ) Locale::Codes::LangFam::add_langfam_alias ( NAME ,NEW_NAME ) Locale::Codes::LangFam::delete_langfam_alias ( NAME ) Locale::Codes::LangFam::rename_langfam_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangFam::add_langfam_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangFam::delete_langfam_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.loc.gov/standards/iso639-5/id.php ISO 639-5 . AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 2011-2012 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.16.2 2012-10-11 Locale::Codes::LangFam(3pm)
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