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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 302560768 by Azrael on Saturday 1st of October 2011 03:17:23 AM
Old 10-01-2011
Quote:
Hopefully, something in this post is of some use to you. If not, provide us with more information such as your platform/operating system, sample output from the commands you're running...
Debian Linux (Squeeze & Sid)

Quote:
The grep|awk|sed|cut|sed|sort|uniq pipeline can be replaced by a single awk invocation:

Code:
awk '/inet addr/ && $2!="127.0.0.1" && !a[$2]++ {sub(/\.[^.]*$/, "", $2); print substr($2,6)}'
This did not work. In particular:
$2!="127.0.0.1" && !a[$2]++ Which should be pretty cross platform.

Code:
# ./broken.sh
Invalid target host specification: 127.0.0
QUITTING!

I noticed what you said was true with the loop. I thought it was odd, but some site showed me to do it like that while outputting array elements. I changed everything to y and I piped through sed to remove 127.0.0.1 again and...

Code:
# ./broken.sh
Invalid target host specification: 192.168.12
QUITTING!

Code:
#!/bin/bash

x=5.21

zero+=( "$(/sbin/ifconfig |  sed -e '/127.0.0.1/d' | awk '/inet addr/ && $2!="127.0.0.1" && !a[$2]++ {sub(/\.[^.]*$/, "", $2); print substr($2,6)}')" )


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

 

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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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