#!/usr/bin/php
  Usage:  -C=<comunity> -H=<host> <action> [-n=<iface_name>] <options>

  Actions:
          -h, --help                show this help
       net
	  -g                        number of interfaces
          -s                        current operational status of this iface
          -i                        input traffic in bps of this iface
          -o                        output traffic in bps of this iface
          -bw                       bandwidth in bps of this iface
          -u                        current bandwidth usage in % if this iface (full duplex)
       sai
	  -mgbc                     Merlin Gerin - Battery charge in %
       misc
	  -v, --version             show version

          Options are parsed in this order. More than one option will execute only
          one action (first found).
  
  Options:
          -w=<warning_value>        warning limit (valid for -i, -o, -u)
                          (use 2 comma separated values [in,out] for -u)
          -c=<critical_value>       critical limit (valid for -i, -o, -u)
                           (use 2 comma separated values [in,out] for -u)
          --neg                     negate the return code (valid for -s)
          -D                        Debug into /tmp/get_snmp.txt file
          
  Examples:
      To get the bandwidth usage for one interface:
          ./get_snmp.php -C=public -H="10.0.1.1" -n="FastEthernet0/23" -u -c="30.5"
      will return:
          bandwidth usage (in,out) for FastEthernet0/23: 30.88%,24.43% - CRITICAL (0.30)

  Return status:
  
  - Without warning nor critical values:
          exit code 0: indicates that request was successfully.
          exit code 1: indicates that request was not successfully.
          
  - If a warning or a critical value is specified:
          exit code 0: OK
          exit code 1: WARNING
          exit code 2: CRITICAL
          exit code 3: UNKNOWN, OTHER