% cat test.pl
#!/usr/bin/env perl
system( "id" );
exit 0;

nrpe[50742]: Running command: /usr/local/bin/sudo /usr/local/etc/nagios/test.pl
nrpe[50742]: Command completed with return code 3 and output:
nrpe[50742]: Return Code: 3, Output: NRPE: Unable to read output