Shell Programming and Scripting

ping -c1 -W1 $IP >/dev/null  ||  record_bad_ip $IP

ssh invalid@$IP 2>&1 | grep -q "No route to host"  &&  record_bad_ip $IP

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

export subnet=1
for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14     17 18 19 20 21 22 23 24 25 26 27 28 29 30
do
echo  "      192.168.$subnet.$i "
/sbin/ping -c 1 -w 1   192.168.$subnet.$i
done

#!/bin/bash
#PING smacker.local (192.168.0.7): 56 data bytes
#64 bytes from 192.168.0.7: icmp_seq=0 ttl=64 time=0.120 ms
#
#--- smacker.local ping statistics ---
#1 packets transmitted, 1 packets received, 0% packet loss
#round-trip min/avg/max/stddev = 0.120/0.120/0.120/0.000 ms
# just get sudo to ask for password sooner
sudo echo -n "$HOSTNAME  "

export subnet=`sudo /sbin/ping -l 3 -c 1  $HOSTNAME  | egrep "ms" | grep -v 100% |sed "s/64 bytes//" | sed "s/icmp_//" | sed "s/\.... ms//"  | sed "s/round.*//"  |sed "s/from//"| grep -v " 0% packet loss" | sed s"/: seq=. ttl=.4 time=.//" |cut -f3 -d\.`

ping $HOSTNAME
echo "++subnet $subnet"

for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 17 18 19 20 21 22 23 24 25 26 27 28 29 30
do
echo  "      192.168.$subnet.$i " 
#       alert    need at least 3 to get min/max average stdDev preload  -l 3  -c 3  uniq only sees first one!
sudo /sbin/ping -A -c 3 -l 3   192.168.$subnet.$i  | egrep "ms" | grep -v 100% |\
sed "N; s/\n/   /;s/64 bytes from/   from/g; s/ttl=.. /& /g; s/icmp_seq=.//g ; s/\/.....\/.....\/+0.00. ms//; s/\/.....\/.....\/nan//; s/\/stddev/ stddev/;s/\/0./ ./g; s/. ms/ms/g ; s/ .\.... \.... \.... .0[01]ms/ms/; s/ \.00ms/ms/; s/   round/ round/g" | grep -v " 0% packet loss" |grep -v "^$" |uniq &

host 192.168.$subnet.$i | grep -v NXDOMAIN | \
      sed "s/in-addr.arpa//; s/ domain name pointer// ; s/^./                &/" &
sleep 0

#sudo /sbin/ping -A -l 3 -c 3    192.168.1.$i  | egrep "ms" | grep -v 100% |sed "N; s/\n/   /;s/64 bytes from/   from/; s/ttl=.. /& /; s/icmp_seq=.// ; s/0.000/ 0/; s/\/.....\/.....\/nan//" | grep -v " 0% packet loss" |grep -v "^$" &

done

#sleep 1
for i in  6   4  2  
do
sleep 2
echo -n $i " processes still running: " ; /bin/ps | wc -l
done
sleep 2
 echo $PS1