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awk question - getting ip from ifconfig

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# 8  
Old 12-11-2009
Quote:
Originally Posted by Franklin52
Explanation:

Code:
$0 ~ var        # if the pattern matches the line
{getline;print $2;exit}    # then read the next line, print the second field and exit

In contrast with the next statement getline reads the next line and continues with the next statement
Thanks Franklin, so if i wanted to match the the second line after (i.e. the Ethernet address from the ifconfig) see below

Code:
e1000g0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
        inet 10.1.1.1 netmask ffff0000 broadcast 10.1.255.255
        ether 0:14:4f:xx.xx.xa

then I assume I wouldnt be able to use the getline command as it is two lines away ...is that right ?
# 9  
Old 12-11-2009
Quote:
Originally Posted by rethink
Thanks Franklin, so if i wanted to match the the second line after (i.e. the Ethernet address from the ifconfig) see below

Code:
e1000g0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
        inet 10.1.1.1 netmask ffff0000 broadcast 10.1.255.255
        ether 0:14:4f:xx.xx.xa

then I assume I wouldnt be able to use the getline command as it is two lines away ...is that right ?
Right, just play around with it and see what happens.

Regards
# 10  
Old 12-11-2009
thanks, I also got it working with the shell variable inside the command Smilie


Code:
#NIC="e1000g0"
# ifconfig -a |nawk 'BEGIN {x=0};/'"$NIC"'/{x=1};/inet/&&x{print $2}'
10.1.1.1


returns the IP
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