cwall man page on HP-UX

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cwall(1M)							     cwall(1M)

       cwall  - Displays a wall(1M) broadcast message on multiple hosts. cwall
       is part of the Distributed Systems Administration Utilities (DSAU).

       Path: /opt/dsau/bin/cwall

       [-g | --groupname groupname] [filename]

       {-h | --help | ? }

       {-V | --version}

       distributes broadcast messages to multiple hosts.   In  a  Serviceguard
       cluster,	 the messages are displayed on all cluster members by default.
       When not in a cluster, host options must be specified or else  defaults
       to displaying the message for only the local host.

       messages	 are  broadcast	 messages  displayed  on  the terminals of all
       logged-in users.	 Users can block the  receipt  of  broadcast  messages
       using .	The -g or --groupname options send the message only to members
       of the specified group in /etc/groups.


       You can select how connects to target systems at runtime using  the  -R
       option.	 ssh  is  the  default transport.  The following protocols are

	      ·	 rsh : Uses an internal, thread-safe implementation of BSD  to
		 run commands using the standard protocol.

	      ·	 (default):  Uses  a  variant of to run multiple copies of the

       -a	 reads the /etc/machines file to obtain	 the  list  of	nodes.
		 This option has no arguments.	Note that /etc/machines is not
		 shipped by default and can be created on  a  per-host	basis.
		 The format for the /etc/machines file is the same as that for
		 the --hostsfile described below.

       -f | --hostsfile filename
		 Runs the commands listed in filename on all nodes  listed  in
		 hostsfile.  The specified files should contain a list of tar‐
		 get hosts, one per line.  Hostlist specifications are	valid.

       --fanout number
		 Set  the  fanout  width,  the	maximum number of simultaneous
		 remote commands, to number.  For example, with 100 hosts  and
		 of 10, DSAU contacts 10 hosts at a time.

       - g | --groupname groupname
		 Display the message only to members of the specified group in

       -h | --help
		 Display command help and quit.

       -l | --list
		 List valid signal names.

       -n | -w | --nodes host1,host2,...
		 Target the specified list of hosts.  No spaces are allowed in
		 the comma-separated list.  The host list may contain hostlist
		 expressions such as ``host[1-5,7]''.	For  more  information
		 about	the hostlist format, see the HOSTLIST EXPRESSIONS sec‐
		 tion below.  This option overrides all other host  specifica‐
		 tion options.

       -R | --rcmd {rsh | ssh}
		 Set remote command transport to rsh or ssh.

       -t | --timeout seconds
		 Set the connect timeout in seconds.

       -u | --ctime seconds
		 Set a limit on the amount of time a remote command is allowed
		 to execute.  Default is no limit.

       --user username
		 Execute remote commands as username.

       -V | --version
		 Shows the version of .

       -x | --exclude host1,host2,...
		 Exclude the specified hosts.  Host lists may also  be	speci‐
		 fied  with  the  option (see the HOSTLIST EXPRESSIONS section

       On non-Serviceguard clusters, if no  other  node	 selection  option  is
       used,  the  CFANOUT_HOSTS environment variable may be set to a filename
       from which a list of target hosts is read.  The	file  must  contain  a
       list of hosts, one per line.  Hostlist expressions are allowed.

       When  using  the transport, non-interactive must have already been con‐
       figured between the source and destination hosts.   does	 not  interac‐
       tively  prompt  for passwords.  Use the tool to help you configure non-
       interactive ssh.	 Similarly, when using rsh, the .rhosts files  on  the
       nodes  must be properly configured.  The connect timeout (-t or --time‐
       out) is not adjustable when using ssh.

       The number of nodes on which can simultaneously execute remote jobs  is
       limited	by  the	 maximum number of threads that can be created concur‐
       rently, as well as the availability of reserved ports in the  rsh  mod‐
       ules.  For additional limitations, see the manpage.

       accepts	lists of hosts in the general form: prefix[m-n,k-l,...], where
       m < n and k < l.	 These expressions are alternatives to explicit	 lists
       of  hosts.   Do not confuse this form with regular expression character
       classes that are also denoted with [].  For example, node[19] does  not
       represent  an  expression  matching  node1 or node9, but represents the
       expression node19.

       Using hostlist expressions is optional.	They are  particularly	useful
       when  a group of systems uses a prefixNNN naming convention.  With this
       capability, you could either specify node1,node9 or  use	 the  hostlist
       expression node[1,9].

       In a Serviceguard cluster, display a message cluster-wide:

	      # cwall

	       Package X is being stopped temporarily for maintenance

       where ^D is Control-D or end-of-file.

       To display a message on terminals of specified hosts:

	      # cwall -w host1,host2,host[3,5,7-11] filename

       where filename contains the message to display.

       , , , , , , , , ,


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