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[root@localhost libexec]# ./check_cisco_fru_module.pl -h
Can't locate Nagios/Plugin.pm in @INC (@INC contains: /usr/local/nagios/libexec /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .) at ./check_cisco_fru_module.pl line 30.
BEGIN failed--compilation aborted at ./check_cisco_fru_module.pl line 30.

in line 30 as below
26 use strict;
27
28 use lib "/usr/local/nagios/libexec";
29
30 use Nagios::Plugin;
31 use Net::SNMP;

[root@localhost libexec]# ./check_cisco_fru_ps.pl -V
Bareword "UNKNOWN" not allowed while "strict subs" in use at ./check_cisco_fru_ps.pl line 299.
Bareword "OK" not allowed while "strict subs" in use at ./check_cisco_fru_ps.pl line 312.
Bareword "UNKNOWN" not allowed while "strict subs" in use at ./check_cisco_fru_ps.pl line 316.
Bareword "UNKNOWN" not allowed while "strict subs" in use at ./check_cisco_fru_ps.pl line 134.
Bareword "UNKNOWN" not allowed while "strict subs" in use at ./check_cisco_fru_ps.pl line 140.
Execution of ./check_cisco_fru_ps.pl aborted due to compilation errors.

zaji_nms wrote:Can't locate Nagios/Plugin.pm in @INC (@INC contains: /usr/local/nagios/libexec /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .) at ./check_cisco_fru_module.pl line 30.

You should be able to run the following to install the missing package

zaji_nms,

In general when you get an alert like this in perl:
you can run this:
and it will install the pre-requisite.