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Fast, flexible, calculating from the command line

Posted by: Vaida Bogdan on March 12, 2008 12:18 PM

A script I use from the net: calcme "30*27.3"



#!/usr/bin/perl



# Usage calcme <string_to_calculate> [<output_format>]

# Input is a string like (10+3)/7 or "(10 + 3) / 7"

# Output is the calculated result of the string

# Optional formatting can supplied as 2nd parameter. 



if (@ARGV == 0 || @ARGV > 2)

{

   die("Usage: $0 <\"formula_to_calculate\"> [<output_format>]\n");

}	



$format = "";

$calcme = $ARGV[0];

(@ARGV == 2) && ($format = $ARGV[1]); 



$output = eval($calcme);



if(@ARGV == 1)

{

   print(STDOUT "$output\n");

}

else

{

   printf(STDOUT "$format\n", $output);

}

exit(0);

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