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Full Discussion: New to Linux scripting question
Top Forums UNIX for Dummies Questions & Answers New to Linux scripting question Post 302943671 by dragonwrench on Monday 11th of May 2015 05:37:52 PM
Old 05-11-2015
New to Linux scripting question
hello i am new to scripting and Linux in general. i am going to school for sys admin and i will need at least some knowledge on scripting. i have been so far ok with learning basic scripting now i am stuck. with a assignment that i was given it was create a script that will tell you if a number is odd or even, i got it to work but don't know why. the script is this:

Code:
#!/bin/bash
echo "please tell me a number between 0 and 20"
read num
even=$(( $num % 2 ))
if [ $even -eq  0 ]
    then echo "you have a even number"
    else echo "you have a odd number"
fi

my question is what does this command do

Code:
even=$(( $num % 2 ))

does it take the number and break it down to the lowest denominator (0 or 1) or does it do something else.
also what doe the % mean in scripting. i looked it up and found out its called that modulo (remainder) but i do not know what that means.
I am not trying to get an easy grade but rather i am trying to learn this because i have intro to programming next quarter and if I learn this now it will help me in the future.
one final thing. if anyone could tell me of a good beginner bash script "cheat sheet" so i can understand the scripting commands. i saw the Unix commands tab but i did not know which one to pick.

thank you
Last edited by Don Cragun; 05-11-2015 at 08:27 PM.. Reason: Add CODE and ICODE tags.
 

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LEARN ABOUT MOJAVE

locale::script

Locale::Script(3pm)					 Perl Programmers Reference Guide				       Locale::Script(3pm)

NAME

       Locale::Script - standard codes for script identification

SYNOPSIS

	  use Locale::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::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::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Script::delete_script  ( CODE [,CODESET] )
       Locale::Script::add_script_alias  ( NAME ,NEW_NAME )
       Locale::Script::delete_script_alias  ( NAME )
       Locale::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::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 v5.18.2							    2013-11-04						       Locale::Script(3pm)
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