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Full Discussion: Bash script to test IP range on server
Top Forums Shell Programming and Scripting Bash script to test IP range on server Post 302465810 by KenJackson on Sunday 24th of October 2010 12:41:41 PM
Old 10-24-2010
This seems to be precisely the problem that the ping command was invented to test.

Can you loop through the IP addresses with a command something like this?
Code:
ping -c1 -W1 $IP >/dev/null  ||  record_bad_ip $IP

If some nodes won't ping, you could use a command something like this
Code:
ssh invalid@$IP 2>&1 | grep -q "No route to host"  &&  record_bad_ip $IP



---------- Post updated at 11:41 AM ---------- Previous update was at 11:09 AM ----------




A quick check of the Fedora repositories revealed three packages that might be helpful. I've never used any of them.
Code:
Name        : fping
Summary     : Scriptable, parallelized ping-like utility
URL         : http://fping.sourceforge.net/
Description : fping is a ping-like program which can determine the accessibility
            : of multiple hosts using ICMP echo requests. fping is designed for
            : parallelized monitoring of large numbers of systems, and is
            : developed with ease of use in scripting in mind.

Name        : tcping
Summary     : Check of TCP connection to a given IP/Port
URL         : http://www.linuxco.de/tcping/tcping.html
Description : tcping does a TCP connect to the given ip/port combination. The
            : user can specify a timeout in seconds. This is useful in shell
            : scripts running in firewalled environments. Often SYNs are just
            : being dropped by firewalls, thus connection establishment will be
            : retried several times (for minutes) until a TCP timeout is
            : reached. With tcping it is possible to check first if the desired
            : port is reachable and then start connection establishment.

Name        : hping3
Summary     : TCP/IP stack auditing and much more
URL         : http://www.hping.org/
Description : hping3 is a network tool able to send custom TCP/IP packets and to
            : display target replies like ping do with ICMP replies. hping3 can
            : handle fragmentation, and almost arbitrary packet size and
            : content, using the command line interface.
            : Since version 3, hping implements scripting capabilties

 

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LEARN ABOUT CENTOS

sieveshell

SIEVESHELL(1)						User Contributed Perl Documentation					     SIEVESHELL(1)

NAME

       sieveshell - remotely manipulate sieve scripts

SYNOPSIS

       sieveshell [--user=user] [--authname=authname] [--realm=realm] [--exec=script] server[:port]

       sieveshell --help

DESCRIPTION

       sieveshell allows users to manipulate their scripts on a remote server.	It works via MANAGESIEVE, a work in progress.

       The following commands are recognized:

	   list list scripts on server.

	   put <filename> upload script to server.

	   get <name> [<filename>] get script. if no filename display to stdout

	   delete <name> delete script.

	   activate <name> activate script.

	   deactivate deactivate all scripts.

OPTIONS

       -u user, --user=user
	   The authorization name to request; by default, derived from the authentication credentials.

       -a authname, --authname=authname
	   The user to use for authentication (defaults to current user).

       -r realm, --realm=realm
	   The realm to attempt authentication in.

       -e script, --exec=script
	   Instead of working interactively, run commands from script, and exit when done.

REFERENCES

       [MANAGESIEVE] Martin, T.; "A Protocol for Remotely Managing Sieve Scripts", draft-ietf-managesieve-03.txt, Mirapoint, Inc.; May 2001, work
       in progress.

AUTHOR

       Tim Martin <tmartin@mirapoint.com>, and the rest of the Cyrus team <cyrus-bugs@andrew.cmu.edu>.

perl v5.16.3							    2014-06-10							     SIEVESHELL(1)
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