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[root@management ~]# ls -l /usr/lib64/nagios/plugins/check_mem 
-rwxr-xr-x. 1 root root 12330 Jul  7 18:21 /usr/lib64/nagios/plugins/check_mem

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nrpe_user=nagios

nrpe_group=nagios

allowed_hosts=Nagios monitor server IP

dont_blame_nrpe=1

command[check_drive]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda
command[check_memory]=/usr/lib64/nagios/plugins/check_mem -f -w 30 -c 10

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Allowing connections from: xx.xx.xx.xx
Jul  8 14:37:16 api nrpe[1835]: Connection from xx.xx.xx.xx port 5784
Jul  8 14:37:16 api nrpe[1835]: Host address is in allowed_hosts
Jul  8 14:37:16 api nrpe[1835]: Handling the connection...
Jul  8 14:37:16 api nrpe[1835]: Host is asking for command 'check_memory' to be run...
Jul  8 14:37:16 api nrpe[1835]: Running command: /usr/lib64/nagios/plugins/check_mem -f -w 20 -c 10
Jul  8 14:37:16 api nrpe[1835]: Command completed with return code 3 and output:
Jul  8 14:37:16 api nrpe[1835]: Return Code: 3, Output: NRPE: Unable to read output
Jul  8 14:37:16 api nrpe[1835]: Connection from pÃ}<9c>ÿ#177 closed.

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define command{
        command_name    check_space
        command_line    /usr/lib64/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c check_drive
        }

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define service{
        use                             generic-service
        host_name                       api-webserver
        service_description             Root Partition
        check_command                   check_space
        }

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define command{
        command_name    check_memori
        command_line    /usr/lib64/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c check_memory
        }

define service{
        use                            generic-service
        host_name                      api-webserver
        service_description            Memory
        check_command                  check_memori
        }

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[root@api ~]# /usr/lib64/nagios/plugins/check_mem -f -w 20 -c 5  
OK - 84.2% (6785808 kB) free.|TOTAL=8059740KB;;;; USED=1273932KB;6447792;7656753;; FREE=6785808KB;;;; CACHES=1024644KB;;;;

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[root@management ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19 -c check_drive
DISK OK - free space: / 11463 MB (86% inode=94%);| /=1716MB;11113;12502;0;13892
[root@management ~]/usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19 -c check_memory
NRPE: Unable to read output

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/usr/lib64/nagios/plugins/check_mem -f -w 30 -c 10
echo $?

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/usr/lib64/nagios/plugins/check_nrpe -H localhost -c check_memory
echo $?

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[root@api ~]# /usr/lib64/nagios/plugins/check_mem -f -w 30 -c 10
OK - 84.1% (6781584 kB) free.|TOTAL=8059740KB;;;; USED=1278156KB;5641818;7253766;; FREE=6781584KB;;;; CACHES=1026604KB;;;;
[root@api ~]# echo $?
0

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[root@api ~]# /usr/lib64/nagios/plugins/check_nrpe -H localhost -c check_memory 
-bash: /usr/lib64/nagios/plugins/check_nrpe: No such file or directory

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#############################################################################
# Sample NRPE Config File 
# Written by: Ethan Galstad ([email protected])
# 
# Last Modified: 11-23-2007
#
# NOTES:
# This is a sample configuration file for the NRPE daemon.  It needs to be
# located on the remote host that is running the NRPE daemon, not the host
# from which the check_nrpe client is being executed.
#############################################################################


# LOG FACILITY
# The syslog facility that should be used for logging purposes.

log_facility=daemon



# PID FILE
# The name of the file in which the NRPE daemon should write it's process ID
# number.  The file is only written if the NRPE daemon is started by the root
# user and is running in standalone mode.

pid_file=/var/run/nrpe.pid



# PORT NUMBER
# Port number we should wait for connections on.
# NOTE: This must be a non-priviledged port (i.e. > 1024).
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

server_port=5666



# SERVER ADDRESS
# Address that nrpe should bind to in case there are more than one interface
# and you do not want nrpe to bind on all interfaces.
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

#server_address=127.0.0.1



# NRPE USER
# This determines the effective user that the NRPE daemon should run as.  
# You can either supply a username or a UID.
# 
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_user=nagios



# NRPE GROUP
# This determines the effective group that the NRPE daemon should run as.  
# You can either supply a group name or a GID.
# 
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_group=nagios



# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames 
# that are allowed to talk to the NRPE daemon. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently 
# supported.
#
# Note: The daemon only does rudimentary checking of the client's IP
# address.  I would highly recommend adding entries in your /etc/hosts.allow
# file to allow only the specified host to connect to the port
# you are running this daemon on.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

allowed_hosts=192.168.0.26
 


# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.  
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! *** 
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=1



# BASH COMMAND SUBTITUTION
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments that contain bash command substitutions of the form
# $(...).  This option only works if the daemon was configured with both 
# the --enable-command-args and --enable-bash-command-substitution configure 
# script options.
#
# *** ENABLING THIS OPTION IS A HIGH SECURITY RISK! *** 
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow bash command substitutions, 
#         1=allow bash command substitutions

allow_bash_command_substitution=0



# COMMAND PREFIX
# This option allows you to prefix all commands with a user-defined string.
# A space is automatically added between the specified prefix string and the
# command line from the command definition.
#
# *** THIS EXAMPLE MAY POSE A POTENTIAL SECURITY RISK, SO USE WITH CAUTION! ***
# Usage scenario: 
# Execute restricted commmands using sudo.  For this to work, you need to add
# the nagios user to your /etc/sudoers.  An example entry for alllowing 
# execution of the plugins from might be:
#
# nagios          ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
#
# This lets the nagios user run all commands in that directory (and only them)
# without asking for a password.  If you do this, make sure you don't give
# random users write access to that directory or its contents!

# command_prefix=/usr/bin/sudo 



# DEBUGGING OPTION
# This option determines whether or not debugging messages are logged to the
# syslog facility.
# Values: 0=debugging off, 1=debugging on

debug=1



# COMMAND TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# allow plugins to finish executing before killing them off.

command_timeout=60



# CONNECTION TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# wait for a connection to be established before exiting. This is sometimes
# seen where a network problem stops the SSL being established even though
# all network sessions are connected. This causes the nrpe daemons to
# accumulate, eating system resources. Do not set this too low.

connection_timeout=300



# WEEK RANDOM SEED OPTION
# This directive allows you to use SSL even if your system does not have
# a /dev/random or /dev/urandom (on purpose or because the necessary patches
# were not applied). The random number generator will be seeded from a file
# which is either a file pointed to by the environment valiable $RANDFILE
# or $HOME/.rnd. If neither exists, the pseudo random number generator will
# be initialized and a warning will be issued.
# Values: 0=only seed from /dev/[u]random, 1=also seed from weak randomness

#allow_weak_random_seed=1



# INCLUDE CONFIG FILE
# This directive allows you to include definitions from an external config file.

#include=<somefile.cfg>



# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

#include_dir=<somedirectory>
#include_dir=<someotherdirectory>



# COMMAND DEFINITIONS
# Command definitions that this daemon will run.  Definitions
# are in the following format:
#
# command[<command_name>]=<command_line>
#
# When the daemon receives a request to return the results of <command_name>
# it will execute the command specified by the <command_line> argument.
#
# Unlike Nagios, the command line cannot contain macros - it must be
# typed exactly as it should be executed.
#
# Note: Any plugins that are used in the command lines must reside
# on the machine that this daemon is running on!  The examples below
# assume that you have plugins installed in a /usr/local/nagios/libexec
# directory.  Also note that you will have to modify the definitions below
# to match the argument format the plugins expect.  Remember, these are
# examples only!


# The following examples use hardcoded command arguments...

#command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
#command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
#command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda
#command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
#command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200 
#command[check_pings]=/usr/lib/nagios/plugins/check_icmp -H localhost
#command[check_swap_space]=/usr/lib/nagios/plugins/check_swap -w 25% -c 10%

command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[check_total_loads]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_drive]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda
command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 250 -c 350 
command[check_pings]=/usr/lib64/nagios/plugins/check_icmp -H localhost
command[check_swap_space]=/usr/lib64/nagios/plugins/check_swap -w 25% -c 10%
command[check_memory]=/usr/lib64/nagios/plugins/check_mem -f -w 50 -c 20

# The following examples allow user-supplied arguments and can
# only be used if the NRPE daemon was compiled with support for 
# command arguments *AND* the dont_blame_nrpe directive in this
# config file is set to '1'.  This poses a potential security risk, so
# make sure you read the SECURITY file before doing this.

#command[check_users]=/usr/lib64/nagios/plugins/check_users -w $ARG1$ -c $ARG2$
#command[check_load]=/usr/lib64/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
#command[check_disk]=/usr/lib64/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
#command[check_procs]=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$
#command[check_memory]=/usr/lib64/nagios/plugins/check_mem -f -w $ARG1$ -c $ARG2$ 

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service nrpe restart

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service xinetd restart

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/usr/lib64/nagios/plugins/check_nrpe -H <remote host ip>
/usr/lib64/nagios/plugins/check_nrpe -H <remote host ip> -c check_memory
echo $?

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[root@management ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19
NRPE v2.15
[root@management ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19 -c check_drive
DISK OK - free space: / 11465 MB (86% inode=94%);| /=1714MB;11113;12502;0;13892
[root@management ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19 -c check_users
USERS OK - 1 users currently logged in |users=1;5;10;0
[root@management ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.0.19 -c check_memory
NRPE: Unable to read output
[root@management ~]# echo $?
130

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#!/usr/bin/perl -w

# Heavily based on the script from:
# check_mem.pl Copyright (C) 2000 Dan Larsson <[email protected]>
# heavily modified by
# Justin Ellison <[email protected]>
#
# The MIT License (MIT)
# Copyright (c) 2011 [email protected]

# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all copies
# or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
# OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

# Tell Perl what we need to use
use strict;
use Getopt::Std;

#TODO - Convert to Nagios::Plugin
#TODO - Use an alarm

# Predefined exit codes for Nagios
use vars qw($opt_c $opt_f $opt_u $opt_w $opt_C $opt_v %exit_codes);
%exit_codes   = ('UNKNOWN' , 3,
        	 'OK'      , 0,
                 'WARNING' , 1,
                 'CRITICAL', 2,
                 );

# Get our variables, do our checking:
init();

# Get the numbers:
my ($free_memory_kb,$used_memory_kb,$caches_kb) = get_memory_info();
print "$free_memory_kb Free\n$used_memory_kb Used\n$caches_kb Cache\n" if ($opt_v);

if ($opt_C) { #Do we count caches as free?
    $used_memory_kb -= $caches_kb;
    $free_memory_kb += $caches_kb;
}

# Round to the nearest KB
$free_memory_kb = sprintf('%d',$free_memory_kb);
$used_memory_kb = sprintf('%d',$used_memory_kb);
$caches_kb = sprintf('%d',$caches_kb);

# Tell Nagios what we came up with
tell_nagios($used_memory_kb,$free_memory_kb,$caches_kb);


sub tell_nagios {
    my ($used,$free,$caches) = @_;
    
    # Calculate Total Memory
    my $total = $free + $used;
    print "$total Total\n" if ($opt_v);

    my $perf_warn;
    my $perf_crit;
    if ( $opt_u ) {
      $perf_warn = int(${total} * $opt_w / 100);
      $perf_crit = int(${total} * $opt_c / 100);
    } else {
      $perf_warn = int(${total} * ( 100 - $opt_w ) / 100);
      $perf_crit = int(${total} * ( 100 - $opt_c ) / 100);
    }
    
    my $perfdata = "|TOTAL=${total}KB;;;; USED=${used}KB;${perf_warn};${perf_crit};; FREE=${free}KB;;;; CACHES=${caches}KB;;;;";

    if ($opt_f) {
      my $percent    = sprintf "%.1f", ($free / $total * 100);
      if ($percent <= $opt_c) {
          finish("CRITICAL - $percent% ($free kB) free!$perfdata",$exit_codes{'CRITICAL'});
      }
      elsif ($percent <= $opt_w) {
          finish("WARNING - $percent% ($free kB) free!$perfdata",$exit_codes{'WARNING'});
      }
      else {
          finish("OK - $percent% ($free kB) free.$perfdata",$exit_codes{'OK'});
      }
    }
    elsif ($opt_u) {
      my $percent    = sprintf "%.1f", ($used / $total * 100);
      if ($percent >= $opt_c) {
          finish("CRITICAL - $percent% ($used kB) used!$perfdata",$exit_codes{'CRITICAL'});
      }
      elsif ($percent >= $opt_w) {
          finish("WARNING - $percent% ($used kB) used!$perfdata",$exit_codes{'WARNING'});
      }
      else {
          finish("OK - $percent% ($used kB) used.$perfdata",$exit_codes{'OK'});
      }
    }
}

# Show usage
sub usage() {
  print "\ncheck_mem.pl v1.0 - Nagios Plugin\n\n";
  print "usage:\n";
  print " check_mem.pl -<f|u> -w <warnlevel> -c <critlevel>\n\n";
  print "options:\n";
  print " -f           Check FREE memory\n";
  print " -u           Check USED memory\n";
  print " -C           Count OS caches as FREE memory\n";
  print " -w PERCENT   Percent free/used when to warn\n";
  print " -c PERCENT   Percent free/used when critical\n";
  print "\nCopyright (C) 2000 Dan Larsson <dl\@tyfon.net>\n";
  print "check_mem.pl comes with absolutely NO WARRANTY either implied or explicit\n";
  print "This program is licensed under the terms of the\n";
  print "MIT License (check source code for details)\n";
  exit $exit_codes{'UNKNOWN'}; 
}

sub get_memory_info {
    my $used_memory_kb  = 0;
    my $free_memory_kb  = 0;
    my $total_memory_kb = 0;
    my $caches_kb       = 0;

    my $uname;
    if ( -e '/usr/bin/uname') {
        $uname = `/usr/bin/uname -a`;
    }
    elsif ( -e '/bin/uname') {
        $uname = `/bin/uname -a`;
    }
    else {
        die "Unable to find uname in /usr/bin or /bin!\n";
    }
    print "uname returns $uname" if ($opt_v);
    if ( $uname =~ /Linux/ ) {
        my @meminfo = `/bin/cat /proc/meminfo`;
        foreach (@meminfo) {
            chomp;
            if (/^Mem(Total|Free):\s+(\d+) kB/) {
                my $counter_name = $1;
                if ($counter_name eq 'Free') {
                    $free_memory_kb = $2;
                }
                elsif ($counter_name eq 'Total') {
                    $total_memory_kb = $2;
                }
            }
            elsif (/^(Buffers|Cached|SReclaimable):\s+(\d+) kB/) {
                $caches_kb += $2;
            }
        }
        $used_memory_kb = $total_memory_kb - $free_memory_kb;
    }
    elsif ( $uname =~ /HP-UX/ ) {
      # HP-UX, thanks to Christoph Fürstaller
      my @meminfo = `/usr/bin/sudo /usr/local/bin/kmeminfo`;
      foreach (@meminfo) {
        chomp;
      	if (/^Physical memory\s\s+=\s+(\d+)\s+(\d+.\d)g/) {
      	  $total_memory_kb = ($2 * 1024 * 1024);
      	}
      	elsif (/^Free memory\s\s+=\s+(\d+)\s+(\d+.\d)g/) {
      	  $free_memory_kb = ($2 * 1024 * 1024);
      	}
      }
     $used_memory_kb = $total_memory_kb - $free_memory_kb;
    }
    elsif ( $uname =~ /FreeBSD/ ) {
      # The FreeBSD case. 2013-03-19 www.claudiokuenzler.com
      # free mem = Inactive*Page Size + Cache*Page Size + Free*Page Size
      my $pagesize = `sysctl vm.stats.vm.v_page_size`;
      $pagesize =~ s/[^0-9]//g;
      my $mem_inactive = 0;
      my $mem_cache = 0;
      my $mem_free = 0;
      my $mem_total = 0;
      my $free_memory = 0;
        my @meminfo = `/sbin/sysctl vm.stats.vm`;
        foreach (@meminfo) {
            chomp;
            if (/^vm.stats.vm.v_inactive_count:\s+(\d+)/) {
            $mem_inactive = ($1 * $pagesize);
            }
            elsif (/^vm.stats.vm.v_cache_count:\s+(\d+)/) {
            $mem_cache = ($1 * $pagesize);
            }
            elsif (/^vm.stats.vm.v_free_count:\s+(\d+)/) {
            $mem_free = ($1 * $pagesize);
            }
            elsif (/^vm.stats.vm.v_page_count:\s+(\d+)/) {
            $mem_total = ($1 * $pagesize);
            }
        }
        $free_memory = $mem_inactive + $mem_cache + $mem_free;
        $free_memory_kb = ( $free_memory / 1024);
        $total_memory_kb = ( $mem_total / 1024);
        $used_memory_kb = $total_memory_kb - $free_memory_kb;
        $caches_kb = ($mem_cache / 1024);
    }
    elsif ( $uname =~ /joyent/ ) {
      # The SmartOS case. 2014-01-10 www.claudiokuenzler.com
      # free mem = pagesfree * pagesize
      my $pagesize = `pagesize`;
      my $phys_pages = `kstat -p unix:0:system_pages:pagestotal | awk '{print \$NF}'`;
      my $free_pages = `kstat -p unix:0:system_pages:pagesfree | awk '{print \$NF}'`;
      my $arc_size = `kstat -p zfs:0:arcstats:size | awk '{print \$NF}'`;
      my $arc_size_kb = $arc_size / 1024;

      print "Pagesize is $pagesize" if ($opt_v);
      print "Total pages is $phys_pages" if ($opt_v);
      print "Free pages is $free_pages" if ($opt_v);
      print "Arc size is $arc_size" if ($opt_v);

      $caches_kb += $arc_size_kb;

      $total_memory_kb = $phys_pages * $pagesize / 1024;
      $free_memory_kb = $free_pages * $pagesize / 1024;
      $used_memory_kb = $total_memory_kb - $free_memory_kb;
    }
    elsif ( $uname =~ /SunOS/ ) {
        eval "use Sun::Solaris::Kstat";
        if ($@) { #Kstat not available
            if ($opt_C) {
                print "You can't report on Solaris caches without Sun::Solaris::Kstat available!\n";
                exit $exit_codes{UNKNOWN};
            }
            my @vmstat = `/usr/bin/vmstat 1 2`;
            my $line;
            foreach (@vmstat) {
              chomp;
              $line = $_;
            }
            $free_memory_kb = (split(/ /,$line))[5] / 1024;
            my @prtconf = `/usr/sbin/prtconf`;
            foreach (@prtconf) {
                if (/^Memory size: (\d+) Megabytes/) {
                    $total_memory_kb = $1 * 1024;
                }
            }
            $used_memory_kb = $total_memory_kb - $free_memory_kb;
            
        }
        else { # We have kstat
            my $kstat = Sun::Solaris::Kstat->new();
            my $phys_pages = ${kstat}->{unix}->{0}->{system_pages}->{physmem};
            my $free_pages = ${kstat}->{unix}->{0}->{system_pages}->{freemem};
            # We probably should account for UFS caching here, but it's unclear
            # to me how to determine UFS's cache size.  There's inode_cache,
            # and maybe the physmem variable in the system_pages module??
            # In the real world, it looks to be so small as not to really matter,
            # so we don't grab it.  If someone can give me code that does this, 
            # I'd be glad to put it in.
            my $arc_size = (exists ${kstat}->{zfs} && ${kstat}->{zfs}->{0}->{arcstats}->{size}) ?
                 ${kstat}->{zfs}->{0}->{arcstats}->{size} / 1024 
                 : 0;
            $caches_kb += $arc_size;
            my $pagesize = `pagesize`;
    
            $total_memory_kb = $phys_pages * $pagesize / 1024;
            $free_memory_kb = $free_pages * $pagesize / 1024;
            $used_memory_kb = $total_memory_kb - $free_memory_kb;
        }
    }
    elsif ( $uname =~ /AIX/ ) {
        my @meminfo = `/usr/bin/vmstat -vh`;
        foreach (@meminfo) {
            chomp;
            if (/^\s*([0-9.]+)\s+(.*)/) {
                my $counter_name = $2;
                if ($counter_name eq 'memory pages') {
                    $total_memory_kb = $1*4;
                }
                if ($counter_name eq 'free pages') {
                    $free_memory_kb = $1*4;
                }
                if ($counter_name eq 'file pages') {
                    $caches_kb = $1*4;
                }
                if ($counter_name eq 'Number of 4k page frames loaned') {
                    $free_memory_kb += $1*4;
                }
            }
        }
        $used_memory_kb = $total_memory_kb - $free_memory_kb;
    }
    else {
        if ($opt_C) {
            print "You can't report on $uname caches!\n";
            exit $exit_codes{UNKNOWN};
        }
    	my $command_line = `vmstat | tail -1 | awk '{print \$4,\$5}'`;
    	chomp $command_line;
        my @memlist      = split(/ /, $command_line);
    
        # Define the calculating scalars
        $used_memory_kb  = $memlist[0]/1024;
        $free_memory_kb = $memlist[1]/1024;
        $total_memory_kb = $used_memory_kb + $free_memory_kb;
    }
    return ($free_memory_kb,$used_memory_kb,$caches_kb);
}

sub init {
    # Get the options
    if ($#ARGV le 0) {
      &usage;
    }
    else {
      getopts('c:fuCvw:');
    }
    
    # Shortcircuit the switches
    if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0) {
      print "*** You must define WARN and CRITICAL levels!\n";
      &usage;
    }
    elsif (!$opt_f and !$opt_u) {
      print "*** You must select to monitor either USED or FREE memory!\n";
      &usage;
    }
    
    # Check if levels are sane
    if ($opt_w <= $opt_c and $opt_f) {
      print "*** WARN level must not be less than CRITICAL when checking FREE memory!\n";
      &usage;
    }
    elsif ($opt_w >= $opt_c and $opt_u) {
      print "*** WARN level must not be greater than CRITICAL when checking USED memory!\n";
      &usage;
    }
}

sub finish {
    my ($msg,$state) = @_;
    print "$msg\n";
    exit $state;
}

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/usr/lib64/nagios/plugins/check_mem

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command[check_memory]=/usr/lib64/nagios/plugins/check_mem -f -w 50 -c 20

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ls -la /usr/lib64/nagios/plugins/check_mem

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su nagios
/usr/lib64/nagios/plugins/check_mem -f -w 50 -c 20
echo $?

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[root@api ~]# ls -la /usr/lib64/nagios/plugins/check_mem
-rwxr-xr-x. 1 root root 12330 Jul  8 13:02 /usr/lib64/nagios/plugins/check_mem

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[root@api ~]# su nagios
bash-4.1$ /usr/lib64/nagios/plugins/check_mem -f -w 50 -c 20
OK - 84.1% (6781292 kB) free.|TOTAL=8059740KB;;;; USED=1278448KB;4029870;6447792;; FREE=6781292KB;;;; CACHES=1026804KB;;;;
bash-4.1$ echo $?
0

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tail -50 /var/log/messages