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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 BSD

lo

LO(4)							     Kernel Interfaces Manual							     LO(4)

NAME

       lo - software loopback network interface

SYNOPSIS

       /sys/conf/SYSTEM:
	    NLOOP     1    # loop-back pseudo-device

DESCRIPTION

       The  loop  interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communica-
       tion.  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.  The loopback interface should be the last interface con-
       figured, as protocols may use the order of configuration as an indication of priority.  The  loopback  should  never  be  configured  first
       unless no hardware interfaces exist.

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

       intro(4N), inet(4F), ns(4F)

BUGS

       Previous versions of the system enabled the loopback interface automatically, using a nonstandard Internet address (127.1).   Use  of  that
       address is now discouraged; a reserved host address for the local network should be used instead.

3rd Berkeley Distribution					  August 1, 1987							     LO(4)
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