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Full Discussion: Syntax error in subtraction in Bash
Top Forums Shell Programming and Scripting Syntax error in subtraction in Bash Post 303040009 by Chubler_XL on Monday 21st of October 2019 08:56:18 PM
Old 10-21-2019
Nice wisecracker. This method would rap up into a fun little bash sum function:

Code:
function sum
{
   local word exp var

   [[ "$1" = *= ]] && var="-v ${1%=}" && shift

   for word in "$@"
   do
       case "$word" in
          [0-9.]*|-[0-9.]*|+|-)
              printf -v ans "%.f" "${word}e+12" 2>/dev/null || ans=$word
              exp="$exp $ans" ;;
          *) echo "sum: $word operator not supported" >&2 ; exit 1 ;;
       esac
   done
   printf $var "%.8f\n" $(( $exp ))e-12
}

sum val= 3.58047 - .68 + .858 + -1.2
echo $val

These 2 Users Gave Thanks to Chubler_XL For This Post:
apmcd47 wisecracker
 

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LEARN ABOUT DEBIAN

syntax

syntax(3pm)						User Contributed Perl Documentation					       syntax(3pm)

NAME

       syntax - Activate syntax extensions

VERSION

       version 0.004

SYNOPSIS

	   # either
	   use syntax 'foo';

	   # or
	   use syntax foo => { ... };

	   # or
	   use syntax qw( foo bar ), baz => { ... };

DESCRIPTION

       This module activates community provided syntax extensions to Perl. You pass it a feature name, and optionally a scalar with arguments, and
       the dispatching system will load and install the extension in your package.

       The import arguments are parsed with Data::OptList. There are no standardised options. Please consult the documentation for the specific
       syntax feature to find out about possible configuration options.

       The passed in feature names are simply transformed: "function" becomes Syntax::Feature::Function and "foo_bar" would become
       "Syntax::Feature::FooBar".

METHODS

   import
	   syntax->import( @spec );

       This method will dispatch the syntax extension setup to the specified feature handlers for the calling package.

   import_into
	   syntax->import_into( $into, @spec );

       Same as "import", but performs the setup in $into instead of the calling package.

   unimport
	   syntax->unimport( @features );

       This method will trigger uninstallations of the @features from the calling package.

   unimport_from
	   syntax->unimport_from( $from, @features );

       Same as "unimport", but will uninstall the @features from $from.

RECOMMENDED FEATURES

       o   Syntax::Feature::Function

	   Activates functions with parameter signatures.

SEE ALSO

       Syntax::Feature::Function, Devel::Declare

BUGS

       Please report any bugs or feature requests to bug-syntax@rt.cpan.org or through the web interface at:
	http://rt.cpan.org/Public/Dist/Display.html?Name=syntax

AUTHOR

       Robert 'phaylon' Sedlacek <rs@474.at>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Robert 'phaylon' Sedlacek.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-05-18							       syntax(3pm)
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