[olug] Unix Tip: GET YOUR IP-ADDRESS

[Phil Brutsche]

Gee, all the fun stuff happens while I'm at work :)

Unix Guru Universe wrote:
 > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 >
 >
 > UNIX GURU UNIVERSE UNIX HOT TIP
 >
 > Unix Tip 1905 - March 20, 2003
 >
 > http://www.ugu.com/sui/ugu/show?tip.today
 >
 > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 >
 >
 >
 > GET YOUR IP-ADDRESS
 >
 > Type this simple command at the unix-prompt
 >
 > ifconfig | grep "inet addr" |  grep -v "127.0.0.1" | awk '{print
 > $2;}' |  awk -F':' '{print $2;}'

This is similar to another tip that was sent out a month or two ago.

This is the line I use in my iptables scripts, which is a good bit simpler:
/sbin/ifconfig eth0 | awk '/inet/ { print $2 }' | awk -F: '{ print $2 }'

I've also used this one:
/sbin/ifconfig eth0 | awk '/inet/ { print substr ($2, 6, length ($2)) }'

Unfortunately, it's also specific to GNU awk (sadly, the substr()
function behaves differently between the different awk implementations).

-- 

Phil Brutsche
phil at brutsche.us