script to develope Post: 302150003

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Top Forums Shell Programming and Scripting script to develope Post 302150003 by vishalpatel03 on Sunday 9th of December 2007 07:04:48 PM

12-09-2007

Registered User

script to develope

Hi
All,

can you please help me to develope this script?
Any help will be appreciated.

Sender Broadcasting Same Message to Multiple Processes

Write two programs, a sender and a receiver. The sender will take text entered
at the keyboard, and broadcast it as a message to multiple copies of the
receiver program. Upon receipt of a message, a receiver outputs its program
name(argv[0]) and the message content. The sender loops sending entered text as
message until end of file is encountered at the keyboard. Upon EOF the sender,
transmits a delimiter message to all receivers. As each receiver finishes with
the message queue, it transmits a message back to sender. After receiving such
an acknowledge message from every receiver, the sender removes the message
queue.

eg.

assume the sender's filename is---msg_wall_s
receiver's filename is ---msg_wall_r

$msg_wall_s
Enter message to be sent to all receivers: abcde
msg_wall_r0 received 'abcde'
msg_wall_r1 received 'abcde'
msg_wall_r2 received 'abcde'
Enter message to be sent to all receivers: xyz
msg_wall_r0 received 'xyz'
msg_wall_r1 received 'xyz'
msg_wall_r2 received 'xyz'
Enter message to be sent to all receivers: <CONTROL/D>
msg_wall_r0 received 'EOF'
msg_wall_r1 received 'EOF'
msg_wall_r2 received 'EOF'
$

Thanks,
Vish

vishalpatel03

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rwhod

rwhod(1M)																 rwhod(1M)

NAME

       rwhod - system status server

SYNOPSIS

DESCRIPTION

       is the server that maintains the database used by and (see rwho(1) and ruptime(1)).  sends status information to and receives status infor-
       mation from other nodes on the local network that are running

       is started at system boot time if the RWHOD variable is set to 1 in the file

       As an information sender, it periodically queries the state of the system and constructs status messages that are broadcast on a network.

       As an information receiver, it listens for other servers' status messages, validates them, then records	them  in  a  collection  of  files
       located in the directory.

       By default, both sends and receives information.  also supports the following options:

	      Configures server to be an information sender only.

	      Configures server to be an information receiver only.

       Status messages are generated approximately once every three minutes.  transmits and receives messages at the port indicated in the service
       specification (see services(4)).  The messages sent and received, are of the form:

       All fields are converted to network byte order before transmission.  System load averages are calculated from the number of jobs in the run
       queue  over  the  last 1-, 5- and 15-minute intervals.  The host name included is the one returned by the system call (see gethostname(2)).
       The array at the end of the message contains information about the users logged in on the sending machine.  This information  includes  the
       contents  of  the entry for each non-idle terminal line and a value indicating the time since a character was last received on the terminal
       line (see utmp(4)).

       discards received messages if they did originate at a server's port, or if the host's name, as  specified  in  the  message,  contains  any
       unprintable ASCII characters.

       Valid  messages	received  by  are  placed in files named in the directory.  These files contain only the most recent message in the format
       described above.

WARNINGS

       does not relay status information between networks.  Users often incorrectly interpret the server dying as a machine going down.

AUTHOR

       was developed by the University of California, Berkeley.

FILES

       Information about other machines.

SEE ALSO

       rwho(1), ruptime(1), gethostname(2), services(4), utmp(4).

																	 rwhod(1M)