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Top Forums Shell Programming and Scripting Syntax error in subtraction in Bash Post 303040005 by ngabrani on Monday 21st of October 2019 12:50:50 PM
Old 10-21-2019
Syntax error in subtraction in Bash

I am sharing a code snippet.
Code:
for (( i=0; i<=$(( $count -1 )); i++ ))
do

	first=${barr2[$i]}
	search=${barr1[$i]}
        echo $first
	echo "loop begins"
	for (( j=0; j<=5000; j++ ))
	do
		if [[ ${harr1[j]} == $search ]]; then
			echo $j
			break;
		fi

	done
	second=${harr2[$j]}	
	echo $second
	
	diff=$((second-first))
	echo "diff" 
	echo $diff
done

I am getting a syntax error in line of subtraction that says something like:
syntax error: invalid arithmetic operator (error token is ".0985146")

This is the line that gives error.
Code:
	diff=$((second-first))

Appreciate your help.
 

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Test::Synopsis(3)					User Contributed Perl Documentation					 Test::Synopsis(3)

NAME
Test::Synopsis - Test your SYNOPSIS code SYNOPSIS
# xt/synopsis.t (with Module::Install::AuthorTests) use Test::Synopsis; all_synopsis_ok(); # Or, run safe without Test::Synopsis use Test::More; eval "use Test::Synopsis"; plan skip_all => "Test::Synopsis required for testing" if $@; all_synopsis_ok(); DESCRIPTION
Test::Synopsis is an (author) test module to find .pm or .pod files under your lib directory and then make sure the example snippet code in your SYNOPSIS section passes the perl compile check. Note that this module only checks the perl syntax (by wrapping the code with "sub") and doesn't actually run the code. Suppose you have the following POD in your module. =head1 NAME Awesome::Template - My awesome template =head1 SYNOPSIS use Awesome::Template; my $template = Awesome::Template->new; $tempalte->render("template.at"); =head1 DESCRIPTION An user of your module would try copy-paste this synopsis code and find that this code doesn't compile because there's a typo in your variable name $tempalte. Test::Synopsis will catch that error before you ship it. VARIABLE DECLARATIONS
Sometimes you might want to put some undeclared variables in your synopsis, like: =head1 SYNOPSIS use Data::Dumper::Names; print Dumper($scalar, @array, \%hash); This assumes these variables like $scalar are defined elsewhere in module user's code, but Test::Synopsis, by default, will complain that these variables are not declared: Global symbol "$scalar" requires explicit package name at ... In this case, you can add the following POD sequence elsewhere in your POD: =for test_synopsis no strict 'vars' Or more explicitly, =for test_synopsis my($scalar, @array, %hash); Test::Synopsis will find these "=for" blocks and these statements are prepended before your SYNOPSIS code when being evaluated, so those variable name errors will go away, without adding unnecessary bits in SYNOPSIS which might confuse users. AUTHOR
Tatsuhiko Miyagawa <miyagawa@bulknews.net> Goro Fuji blogged about the original idea at <http://d.hatena.ne.jp/gfx/20090224/1235449381> based on the testing code taken from Test::Weaken. LICENSE
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Test::Pod, Test::UseAllModules, Test::Inline, Test::Snippet perl v5.16.3 2009-07-06 Test::Synopsis(3)
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