64-bit arithmetic in scripts?

Dan Nelson dnelson at allantgroup.com
Thu Sep 30 12:40:06 PDT 2004

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

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

	Dan Nelson
	dnelson at allantgroup.com

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