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Full Discussion: A bi directional script that will monitor the TCP/IP connections between two physical
Top Forums Shell Programming and Scripting A bi directional script that will monitor the TCP/IP connections between two physical Post 302277436 by angheloko on Friday 16th of January 2009 09:41:33 AM
Old 01-16-2009
Not tested but gives you the idea
Say you have your list.

Code:
cat <list_of_server> | while read x; do
ping $x
if [ $? -ne 0 ]; then
  # Oh no, there's something wrong with the server. Ping exited with a non-zero. Do stuff here like ftp SMS file to your SMS server
fi
done

Check ping command for more info (man ping)

Code:
...
...
If ping does not receive any reply packets at all it will exit with code
1.  On error it exits with code 2. Otherwise it exits with code 0. This
makes it possible to use the exit code to see if a host is alive or not.

This program is intended for use in network testing, measurement and man-
agement.  Because of the load it can impose on the network, it is unwise
to use ping during normal operations or from automated scripts.
...
...

 

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LEARN ABOUT NETBSD

monitor

monitor(1)                                                        monitor command                                                       monitor(1)

NAME

       monitor - receive logging information from LPD

SYNOPSIS

       monitor [ -u ] [ -t ] [ port ]

DESCRIPTION

       The  monitor  program is a template for a printer status monitoring program.  It will open the specified TCP and/or UDP port, and then wait
       for accounting or other information to be sent.  It prints this information on it standard output.

OPTIONS

       -u   wait for connections on the UDP port.

       -t   wait for connections on the TCP port.

       port Use the specified port number.

EXIT STATUS

       The following exit values are returned:

       zero (0)       Successful completion.

       non-zero (!=0) An error occurred.

SEE ALSO

       lpd.conf(5), lpc(8), lpd(8), checkpc(8), lpr(1), lpq(1), lprm(1), printcap(5), lpd.conf(5), pr(1), lprng_certs(1), lprng_index_certs(1).

AUTHOR

       Patrick Powell <papowell@lprng.com>.

HISTORY

       LPRng is a enhanced printer spooler system with functionality similar to the Berkeley LPR software.  The LPRng developer  mailing  list  is
       lprng-devel@lists.sourceforge.net; subscribe by visiting https://lists.sourceforge.net/lists/listinfo/lprng-devel or sending mail to lprng-
       request@lists.sourceforge.net with the word subscribe in the body.
       The software is available via http://lprng.sourceforge.net

LPRng                                                               2006-12-09                                                          monitor(1)
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