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Full Discussion: Array output through a for loop problematic with multiple elements.
Top Forums Shell Programming and Scripting Array output through a for loop problematic with multiple elements. Post 302560431 by Azrael on Thursday 29th of September 2011 09:40:08 PM
Old 09-29-2011
Array output through a for loop problematic with multiple elements.
This code works perfect when using a machine with only one interface online. (Excluding the loopback of course) But when I have other interface up for vmware or a vpn the output gets mixed up. I know I had this working when I was just reading ip's from files so I know it is not a problem with nmap, even though it feeds back the error. Any help much appreciated.

Code:
#!/bin/bash

x=5.21

zero+=( "$(/sbin/ifconfig | grep "inet addr" | awk '{ print $2 }' | sed -e '/127.0.0.1/d' | cut -c6- | sed 's/.[^.]*$//' | uniq)" )

v=`nmap --version | grep "Nmap" | awk '{ print $3 }'`


for i in "${zero[@]}"
do
        if [ $v == $x ]; then
                one+=( "$(nmap -sP $i.0/24 | grep report | awk '{ print $5 }')" )
                sleep 1
        else
                one+=( "$(nmap -sP $i.0/24 | grep Host | awk '{ print $2 }')" )
                sleep 1
        fi
done

y=0
length=${#one[@]}
for (( z = 0; z < $length; z++ ));
do
    echo -e "${one[$y]}\n"
done

By the way. I have only tested this with nmap 5.00 and 5.21. It may not work at all on other versions.
 

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LEARN ABOUT DEBIAN

loop

LO(4)							   BSD Kernel Interfaces Manual 						     LO(4)

NAME

     lo -- software loopback network interface

SYNOPSIS

     device loop

DESCRIPTION

     The loop interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communication.
     As with other network interfaces, the loopback interface must have network addresses assigned for each address family with which it is to be
     used.  These addresses may be set or changed with the SIOCSIFADDR ioctl(2).  The loopback interface should be the last interface configured,
     as protocols may use the order of configuration as an indication of priority.  The loopback should never be configured first unless no hard-
     ware interfaces exist.

     If the transmit checksum offload capability flag is enabled on a loopback interface, checksums will not be generated by IP, UDP, or TCP for
     packets sent on the interface.

     If the receive checksum offload capability flag is enabled on a loopback interface, checksums will not be validated by IP, UDP, or TCP for
     packets received on the interface.

     By default, both receive and transmit checksum flags will be enabled, in order to avoid the overhead of checksumming for local communication
     where data corruption is unlikely.  If transmit checksum generation is disabled, then validation should also be disabled in order to avoid
     packets being dropped due to invalid checksums.

DIAGNOSTICS

     lo%d: can't handle af%d.  The interface was handed a message with addresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO

     inet(4), intro(4)

HISTORY

     The lo device appeared in 4.2BSD.	The current checksum generation and validation avoidance policy appeared in FreeBSD 8.0.

BSD
								  March 15, 2009							       BSD
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