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Full Discussion: Date Validation not working
Top Forums UNIX for Dummies Questions & Answers Date Validation not working Post 302904222 by Aia on Tuesday 3rd of June 2014 02:25:19 AM
Old 06-03-2014
Quote:
Originally Posted by senthil.ak
Hi Aia, Here i know the format, that is constant its either
Code:
 %d/%m/%Y or %Y/%m/%d

or any other format, we need to validate user input for the format. User inputs may vary and until we wont exit the loop unless user enters the correct format.
I suppose if you want to play guessing you can always try to convert anything that it is not %Y/%m/%d to it.

Some possibility in the shell
Code:
big_endian () {

data=${1}
segment1=${data%%/*}
segment3=${data##*/}
tmp=${data%/*}
segment2=${tmp#*/}

[[ "${segment1}" == ?? ]] && data="${segment3}/${segment2}/${segment1}"

echo ${data}
}

Maybe shell and external tr call
Code:
big_endian () {

data=${1}

segments=($(echo ${data} | tr '/' ' '))
[[ "${segments[0]}" == ?? ]] &&  data="${segments[2]}/${segments[1]}/${segments[0]}"

echo ${data} 
}

How about plain awk?
Code:
$date_string=$(echo $date_string | awk '{if ($1 ~ /^[0-9][0-9]$/){ print $3,$2,$1} else {print}}' FS='/' OFS='/')

As I said it is just playing a guessing game.
Last edited by Aia; 06-03-2014 at 05:04 AM..
 

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LEARN ABOUT MOJAVE

locale::codes::langfam

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) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2013-11-04					       Locale::Codes::LangFam(3pm)
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