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Top Forums Shell Programming and Scripting extracting the ip address from ifconfig Post 302357298 by skmdu on Tuesday 29th of September 2009 10:07:25 AM
Old 09-29-2009
Code:
$ ifconfig eth0 | perl -ne 'if ( /inet addr:(^\s]+)/) { print $1; }'

 

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IFCONFIG(8)						      System Manager's Manual						       IFCONFIG(8)

NAME
ifconfig - configure a TCP/IP device SYNOPSIS
ifconfig [-I ip-device] [-h ipaddr] [-n netmask] [-iv] DESCRIPTION
Ifconfig initializes a TCP/IP device setting the IP address and/or netmask. It will report the address and netmask set. This command may be used if the system has not been configured properly yet. It is only used at boot time to set a fixed address for a system without a physical ethernet. Normally the inet task will find it out by itself from the RARP server. OPTIONS
-h The decimal TCP/IP address to set. -n The netmask to set. -i Don't set the IP address or netmask if already set. This way ifconfig cannot interfere if the numbers have been found out by RARP. -v Report IP address and netmask. This is the default action if there are no other options. SEE ALSO
hostaddr(1), rarpd(8), set_net_default(8), boot(8). AUTHOR
Kees J. Bot (kjb@cs.vu.nl) IFCONFIG(8)
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