Munin contributed plugins

#!/bin/sh

#Plugin created by:

# Stephen Hodgson

# Malone College - CPSC

#This script is provided as-is with no warranty or guarantee of any kind.

#-This simple plugin figures out how many users are logged into the linux box and writes it to a simple Gauge-style graph.

#-The plugin takes advantage of the linux 'who' command.

# -The who command is cut into the first field (to the first space).

#  -This is the username field.

#   -Unfortunately this will log multiples for the same user if multiple terminals are open.

#  -Then we need to sort the results since uniq only deals with unique elements next in line to each other.

#  -We find the uniqe usernames logged on.

#  -Then wc -l counts how many lines (users) we're left with.

if [ "$1" = "config" ]; then

echo 'graph_title Users Online'

echo 'graph_args --base 1000 -l 0 '

echo 'graph_vlabel Number of users'

echo 'graph_category system'

echo 'users.label users'

echo 'graph_args --base 1000 -l 0'

echo 'graph_scale no'

exit 0

fi

echo -n "users.value "

echo `who | cut -f -1 -d ' ' | sort | uniq | wc -l`