check_mem.pl returns NRPE: Unable to read output

[Scott Anderson]

I am using the check_mem.pl script created buy Justin Ellison. I can run it
on my 64 bit box as the user nagios, with out a problem. my nrpe.cfg line
looks like this:

command[check_mem]=/usr/lib64/nagios/plugins/check_mem.pl -f -C -w 20 -c 10

but on the nagios page I get the Unable to read output..

I cannot figure out why this is since as the nagios user on the box I get
this as output..

outland /etc/nagios $sudo su - nagios
-sh-4.1$ /usr/lib64/nagios/plugins/check_mem.pl -f -C -w 20 -c 10
OK - 89.9% (3292024 kB) free.|TOTAL=3663148KB;;;; USED=371124KB;;;;
FREE=3292024KB;;;; CACHES=1043004KB;;;;

so it works as a stand alone but not within nrpe/nagios
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