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RUN(1)			FreeBSD	General	Commands Manual			RUN(1)

     run -- run	a command on a machine at random

     run [-aeiqtv] [-g rungroup1,...,rungroupN]	[-l username] [-o porttimeout]
	 [-p portnum] [-w node1,...,nodeN] [-x node1,...,nodeN]	[command ...]

     The run utility can be used to run	a command, or group of commands	on a
     cluster of	machines.  The command or commands are run on a	single node in
     the cluster, which	is chosen at random.  The following options are	avail-

     -a	  The -a option	modifies the behavior of seq when dealing with stdin.
	  Normally all commands	from stdin are run on the same machine.	 Spec-
	  ifying the -a	option causes each command to be run on	a random node.

     -e	  Unless the -e	option is specified, stderr from remote	commands will
	  not be reported to the user.

     -i	  The -i option	will list information about the	current	cluster, and
	  command groupings.  It will also show	you which command you are
	  about	to run,	and your username if specified with the	-l option.

     -q	  The -q option	does not issue any commands, but displays information
	  about	the cluster.

     -v	  Prints the version of	ClusterIt to the stdout, and exits.

     -g	  If the -g option is specified, followed by a comma separated list of
	  group	names, the command will	only be	run on that group of nodes.  A
	  node may be a	part of	more than one group if desired,	however	run-
	  ning without the -g option will run the command on the same node as
	  many times as	it appears in the file specified by the	CLUSTER	envi-
	  ronment variable.  This option is silently ignored if	used with the
	  -w option.

     -l	  If the -l option is specified, followed by a username, the commands
	  will be run under that userid	on the remote machines.	 Consideration
	  must be taken	for proper authentication, for this to work.

     -o	  The -o option	is used	to set the timeout in seconds to be used when
	  testing remote connections.  The default is five seconds.

     -p	  The -p option	can be used to set the port number that	testing	should
	  occur	on when	testing	remote connections.  The default behavior is
	  to guess based on the	remote command name.

     -t	  The -t option	causes run to attempt a	connection test	to each	node
	  prior	to attempting to run the remote	command.  If the test fails
	  for any reason, the remote command will not be attempted.  This can
	  be useful when clusterfiles have suffered bitrot and some nodes no
	  longer exist,	or might be down for maintenance.  The default timeout
	  is 5 seconds.	 The timeout can be changed with the -o	option.	 run
	  will attempt to guess	the port number	of the remote service based on
	  your RCMD_CMD	setting.  It knows about ssh and rsh.  If run fails to
	  guess	your port correctly, you may use the -p	argument to set	the
	  remote port number.  If the RCMD_TEST	environment variable exists,
	  the testing will automatically take place.

     -w	  If the -w option is specified, followed by a comma delimited list of
	  machine names, the command will be run on each node in the list.
	  Without this option, run runs	on the nodes listed in the file
	  pointed to by	the CLUSTER environment	variable.

     -x	  The -x option	can be used to exclude specific	nodes from the clus-
	  ter.	The format is the same as the -w option, a comma delimited
	  list of machine names.  This option is silently ignored if used with
	  the -w option.

     run utilizes the following	environment variables.

     CLUSTER	    Contains a filename, which is a newline separated list of
		    nodes in the cluster.

     RCMD_CMD	    Command to use to connect to remote	machines.  The command
		    chosen must	be able	to connect with	no password to the re-
		    mote host.	Defaults to rsh

     RCMD_CMD_ARGS  Arguments to pass to the remote shell command.  Defaults
		    to none.

     RCMD_USER	    The	username to connect to remote machines as by default.

     RCMD_PORT	    The	port number used to test remote	connections.  See the
		    -p flag.

     RCMD_TEST	    When set, run will automatically test all hosts before
		    launching the remote command. See the -t option for	more

		    The	timeout	in seconds to use when testing for remote con-

     Exit status is 0 on success, 1 if an error	occurs.

     dsh(1), rsh(1), seq(1), kerberos(3), hosts.equiv(5), rhosts(5)

     The run command appeared in clusterit 1.1.

     Run was written by	Tim Rightnour.

			       January 10, 2007


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