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Full Discussion: Checking input is Numerical
Top Forums Shell Programming and Scripting Checking input is Numerical Post 302387869 by Scrutinizer on Monday 18th of January 2010 04:35:01 PM
Old 01-18-2010
Quote:
Originally Posted by gregarion
its the -d command which i do not get it. a syntax for a normal tr command would be

Code:
tr [set1][set2]

so how does it work in the code above. basically, the input of $this is being deleted only if it is a numerical number since we specified [[:digit:]]?. am i getting it right?
If you do:
Code:
man tr

you'll find that tr -d [set1] means delete the characters in set 1.
The code above is in fact broken:
1. they are testing for numerical values not alphanumerical
2. They left out single quotes so the command was not working right:

Try this:
Code:
echo "read this"
read this
if [ -z $(echo "$this" | tr -d '[[:digit:]]') ] ;
then
  echo "True - only numeric or the string was empty"
else
  echo "False - there is NON numeric stuff here!"
fi

But you do not need an external command, e.g.:
Code:
echo "read this"
read this
case $this in
  *[^0-9]*|"") echo "False - there is NON numeric stuff here or string is empty"    ;;
  *)           echo "True - only numeric"  ;;
esac

Last edited by Scrutinizer; 01-20-2010 at 03:14 AM..
 

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LEARN ABOUT CENTOS

locale::codes::script

Locale::Codes::Script(3)				User Contributed Perl Documentation				  Locale::Codes::Script(3)

NAME

       Locale::Codes::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Codes::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Codes::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. 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:

	  $script = code2script('phnx','alpha');
	  $script = code2script('phnx',LOCALE_SCRIPT_ALPHA);

       The codesets currently supported are:

       alpha, LOCALE_SCRIPT_ALPHA
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.  It also includes additions to this set
	   included in the IANA language registry.

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       num, LOCALE_SCRIPT_NUMERIC
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Codes::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Codes::Script::delete_script  ( CODE [,CODESET] )
       Locale::Codes::Script::add_script_alias	( NAME ,NEW_NAME )
       Locale::Codes::Script::delete_script_alias  ( NAME )
       Locale::Codes::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::delete_script_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.unicode.org/iso15924/
	   Home page for ISO 15924.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2013 Sullivan Beck

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

perl v5.16.3							    2013-02-27						  Locale::Codes::Script(3)
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