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Adding 2 numbers

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Top Forums Shell Programming and Scripting Adding 2 numbers
# 8  
Old 04-17-2004
Quote:
Originally posted by Viper01
First of all, thank you very much for help, but I still have problems:

- I have to write my script without bc or dc commands.

- I would like to sum very-very big numers (600 characters long).
It doesn't work with let, expr, or awk. (because of overflow)

Have you got any idea, how to solve this problem?

Thank you!
Code:
echo "scale=600;1/7"|bc
.1428571428571428571428571428571428571428571428571428571428571428571\
42857142857142857142857142857142857142857142857142857142857142857142\
85714285714285714285714285714285714285714285714285714285714285714285\
71428571428571428571428571428571428571428571428571428571428571428571\
42857142857142857142857142857142857142857142857142857142857142857142\
85714285714285714285714285714285714285714285714285714285714285714285\
71428571428571428571428571428571428571428571428571428571428571428571\
42857142857142857142857142857142857142857142857142857142857142857142\
857142857142857142857142857142857142857142857142857142857
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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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