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/usr/share/munin/plugins/multips is in munin-node 1.4.6-3ubuntu3.4.

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The actual contents of the file can be viewed below.

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#!/bin/sh
# -*- sh -*-

: <<=cut

=head1 NAME

multips - Munin plugin to monitor number of processes. Which processes
are configured in client-conf.d

=head1 APPLICABLE SYSTEMS

Any system with a pgrep, /usr/ucb/ps or other UCB compatible ps command.

=head1 CONFIGURATION

There is no default configuration.  This is an example:

  [multips]
     env.names pop3d imapd sslwrap
     env.regex_imapd ^[0-9]* imapd:
     env.regex_pop3d ^[0-9]* pop3d:

The regex parts are not needed if the name given in "names" can be
used to grep with directly.

=head1 INTERPRETATION

This plugin simply counts the total number of processes matching the
configured regular expressions.  The regular expressions are
interpreted by "grep" (and not egrep or perl).

=head1 MAGIC MARKERS

  #%# family=manual
  #%# capabilities=autoconf

=head1 VERSION

  $Id: multips.in 1966 2009-04-01 12:24:27Z kjellm $

=head1 BUGS

None known

=head1 AUTHOR

Unknown

=head1 LICENSE

GPLv2

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

if [ "$1" = "autoconf" ]; then
	echo yes
	exit 0
fi

if [ -z "$names" ]; then
  echo "Configuration required"
  exit 1
fi

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

	echo graph_title Number of selected processes
	echo 'graph_category processes'
	echo 'graph_args --base 1000 --vertical-label processes -l 0'
	for name in $names; do
	    	fieldname=$(clean_fieldname $name)
		eval REGEX='"${regex_'$name'-\<'$name'\>}"'

		echo "$fieldname.label $name"
		echo "$fieldname.draw LINE2"
		echo "$fieldname.info Processes matching this regular expression: /$REGEX/"
		print_warning "$fieldname"
		print_critical "$fieldname"
	done
	exit 0
fi

for name in $names; do
        fieldname=$(clean_fieldname $name)
	printf "$fieldname.value "

	eval REGEX='"${regex_'$name'-\<'$name'\>}"'
	PGREP=$(which pgrep)
	if [ -n "$PGREP" -a -x "$PGREP" ]; then
		$PGREP -f -l "$name" | grep "$REGEX" | wc -l
	elif [ -x /usr/ucb/ps ]; then
		# Solaris without pgrep. How old is that?
		/usr/ucb/ps auxwww | grep "$REGEX" | grep -v grep | wc -l
	else
		ps auxwww | grep "$REGEX" | grep -v grep | wc -l
	fi
done