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Top Forums Shell Programming and Scripting obtain a new variable out of "for statment" Post 302083960 by tmarikle on Tuesday 8th of August 2006 12:22:19 PM
Old 08-08-2006
Maybe not what you are expecting but it meets the requirement as I read it:
Note: this works with ksh and bash
Code:
{
    unset A B C
    A=192.168.16.1
    B=192.168.32.1
    C=192.168.64.1

    # Add "var=" so that the code has something to work with following nawk's work
    for i in A=$A B=$B C=$C
    do
        # Use eval to make assignemnt
        # ...this will translate into var=nawk's output
        eval ${i%%=*}=$(echo "${i##*=}" | nawk -F. '{
            if ($3 >= 16 && $3 < 32)
                print "192.168.202.1"
            else
                print
        }')
    done
    echo A=$A
    echo B=$B
    echo C=$C
}

Output:
Code:
A=192.168.202.1
B=192.168.32.1
C=192.168.64.1

This can also be done without using awk.
 

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NOS-TUN(8)						    BSD System Manager's Manual 						NOS-TUN(8)

NAME
nos-tun -- implement ``nos'' or ``ka9q'' style IP over IP tunnel SYNOPSIS
nos-tun -t tunnel -s source -d destination -p protocol_number [source] target DESCRIPTION
The nos-tun utility is used to establish an nos style tunnel, (also known as ka9q or IP-IP tunnel) using a tun(4) kernel interface. Tunnel is the name of the tunnel device /dev/tun0 for example. Source and destination are the addresses used on the tunnel device. If you configure the tunnel against a cisco router, use a netmask of ``255.255.255.252'' on the cisco. This is because the tunnel is a point-to-point interface in the FreeBSD end, a concept cisco does not really implement. Protocol number sets tunnel mode. Original KA9Q NOS uses 94 but many people use 4 on the worldwide backbone of ampr.org. Target is the address of the remote tunnel device, this must match the source address set on the remote end. EXAMPLES
This end, a FreeBSD box on address 192.168.59.34: nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45 Remote cisco on address 192.168.56.45: interface tunnel 0 ip address 192.168.61.2 255.255.255.252 tunnel mode nos tunnel destination 192.168.59.34 tunnel source 192.168.56.45 AUTHORS
Nickolay N. Dudorov <nnd@itfs.nsk.su> wrote the program, Poul-Henning Kamp <phk@FreeBSD.org> wrote the man-page. Isao SEKI <iseki@gongon.com> added a new flag, IP protocol number. BUGS
We do not allow for setting our source address for multihomed machines. BSD
April 11, 1998 BSD
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