Re: 64-bit arithmetic in scripts?

From: Dan Nelson (dnelson_at_allantgroup.com)
Date: 09/30/04

  • Next message: Christian Hiris: "Re: How do you know how to install ports? (like vmware3)" 
    Date: Thu, 30 Sep 2004 14:40:01 -0500
To: Andrew <infofarmer@mail.ru>

    In the last episode (Sep 30), Andrew said:
    > I'm counting traffic with ipfw and shell scripts. Is there a way to
    > use more than 32-bit numbers in shell arithmetic?

    POSIX only requires "signed long" support in the shell, but FreeBSD's
    expr command has a -e flag that will let it do 64-bit math:

    $ echo $(( 65536*65536 ))
    0
    $ echo $(expr 65536 "*" 65536)
    0
    $ echo $(expr -e 65536 "*" 65536)
    4294967296

    bash, ksh93 (but not pdksh), and zsh's shell arithmetic are all 64-bit,
    also. 

    -- 
	Dan Nelson
	dnelson@allantgroup.com
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  • Next message: Christian Hiris: "Re: How do you know how to install ports? (like vmware3)"

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