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Re: random number generator

From: Eric Blake
Subject: Re: random number generator
Date: Wed, 18 Aug 2010 15:25:16 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100720 Fedora/3.1.1-1.fc13 Lightning/1.0b2pre Mnenhy/0.8.3 Thunderbird/3.1.1

On 08/18/2010 03:08 PM, mikeyzman wrote:
>> It worked for me:
>> $ m4
>> define(`number',`esyscmd(`/bin/bash -c "printf \"$RANDOM\""')')dnl
>> number
>> 24246
>> number
>> 4597
>> number
>> 17644

Bah.  Problem of quoting.  "" interpolates within the outer shell, so
you _also_ need to escape the $ to have it make it to the inner shell.

define(`number',`esyscmd(`/bin/bash -c "printf \"\$RANDOM\""')')dnl

That's why I like [] better than `' when mixing m4 with shell, because
'' quoting is easier than "" quoting for writing bash -c 'do-this'

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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