Puppet users - Mar 2014 - Create variable as result of command execution

Hello,

What is the best way in puppet to create a variable as result of command 
below:
*$nginx_dir=`/usr/sbin/nginx -V 2> /etc/puppet/nginx.args | /bin/cat 
/etc/puppet/nginx.args | /usr/bin/awk -F'--http-proxy-temp-path='
{'print
$2'} | /usr/bin/awk {'print $1'}  | /bin/grep '\/'`*

Any advices will be appreciated.

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