cwall.1m (2012 03)

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cwall(1M) cwall(1M)

NAME

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

Administration Utilities (DSAU).

SYNOPSIS

Path: /opt/dsau/bin/cwall

cwall [command fanout options][-g | --groupname groupname][ﬁlename]

cwall {-h | --help | ? }

cwall {-V | --version}

DESCRIPTION

cwall distributes wall(1M) broadcast messages to multiple hosts. In a Serviceguard cluster, the mes-

sages are displayed on all cluster members by default. When not in a cluster, host options must be

speciﬁed or else cwall defaults to displaying the message for only the local host.

wall messages are broadcast messages displayed on the terminals of all logged-in users. Users can

block the receipt of broadcast messages using

mesg(1). The -g or --groupname options send the mes-

sage only to members of the speciﬁed group in /etc/groups.

REMOTE COMMAND TRANSPORT OPTIONS

You can select how

cwall connects to target systems at runtime using the -R option. ssh is the default

transport. The following protocols are supported:

• rsh :

Uses an internal, thread-safe implementation of BSD

rcmd(3) to run commands using the

standard

rsh(1) protocol.

•

ssh (default):

Uses a variant of

popen(3) to run multiple copies of the ssh(1) command.

Options

-a

cwall 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 target hosts, one per line. Hostlist speciﬁcations are valid. See HOSTLIST

EXPRESSIONS below.

--fanout number

Set the fanout width, the maximum number of simultaneous remote commands, to number.

For example, with 100 hosts and

--fanout of 10, DSAU contacts 10 hosts at a time.

-g | --groupname groupname

Display the message only to members of the speciﬁed group in /etc/groups.

-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 section below. This option overrides all

other host speciﬁcation 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.

HP-UX 11i Version 3: March 2012 − 1 − Hewlett-Packard Company 1

Summary of content (2 pages)

PAGE 1
cwall(1M) cwall(1M) NAME cwall - Displays a wall(1M) broadcast message on multiple hosts. cwall is part of the Distributed Systems Administration Utilities (DSAU). SYNOPSIS Path: /opt/dsau/bin/cwall cwall [command fanout options] [-g | --groupname groupname] [filename] cwall {-h | --help | ? } cwall {-V | --version} DESCRIPTION cwall distributes wall(1M) broadcast messages to multiple hosts. In a Serviceguard cluster, the messages are displayed on all cluster members by default.
PAGE 2
cwall(1M) cwall(1M) --user username Execute remote commands as username. -V | --version Shows the version of cwall. -x | --exclude host1,host2,... Exclude the specified hosts. Host lists may also be specified with the -exclude option (see the HOSTLIST EXPRESSIONS section below). A cA ENVIRONMENT VARIABLES 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.