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I’ve tried your plugin for Nagios but I ran into some problems after compiling.
I’m using Nagios XI 2012v1.6 on CentOS 6.3 (x64) --with-nagios-group=nagios --with-perl=/usr/bin/perl
Make
Make install

When I execute the plugin (as root) to a HP Procurve switch I get an error:
[root@SV14808 libexec]# ./check_nwc_health --hostname AC07887
Use of uninitialized value in pattern match (m//) at ./check_nwc_health line 14348.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14352.
Use of uninitialized value in string eq at ./check_nwc_health line 14358.
Use of uninitialized value in printf at ./check_nwc_health line 14360.
UNKNOWN - mode
check_nwc_health $Revision: 1.9.7.3 $ [http://labs.consol.de/nagios/check_nwc_health]

Am I missing something. Hope to hear from you.

When i do a local check with the example
./check_linux_stats.pl -C -w 90 -c 100 -s 5
I get a error (see underneath).
It seems he misses a perl module. Is this right?
I could find a perl-Sys-Statistics-Linux rpm (I'm on SLES 10 SP2). Do I have to install this?

Can't locate Sys/Statistics/Linux.pm in @INC (@INC contains: /usr/local/nagios/libexec /usr/lib/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 /usr/lib/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl .) at ./check_linux_stats.pl line 31.
BEGIN failed--compilation aborted at ./check_linux_stats.pl line 31.