Learning IP address of your machine in OS X sometimes gives you a headache. Because when you try to use <em>ifconfig</em> command, you will get a response like:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 01:1f:5e:e8:a8:33
media: autoselect status: inactive
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21e:c20f:feac:ecdb%en1 prefixlen 64 scopeid 0x5
inet 192.168.1.100 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:1e:c3:bc:1c:eb
media: autoselect status: active
supported media: autoselect
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
lladdr 00:1a:f1:fe:ae:0e:2b:7e
media: autoselect <full-duplex> status: inactive
supported media: autoselect <full-duplex>
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21c:42af:1e00:8%en2 prefixlen 64 scopeid 0x7
inet 10.211.55.2 netmask 0xffffff00 broadcast 10.211.55.255
ether 00:10:42:00:00:08
media: autoselect status: active
supported media: autoselect
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe81::21c:42ff:fa00:9%en3 prefixlen 64 scopeid 0x8
inet 10.37.121.2 netmask 0xffffff00 broadcast 10.37.129.255
ether 00:1c:42:10:00:09
media: autoselect status: active
supported media: autoselect
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 01:1f:5e:e8:a8:33
media: autoselect status: inactive
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21e:c20f:feac:ecdb%en1 prefixlen 64 scopeid 0x5
inet 192.168.1.100 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:1e:c3:bc:1c:eb
media: autoselect status: active
supported media: autoselect
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
lladdr 00:1a:f1:fe:ae:0e:2b:7e
media: autoselect <full-duplex> status: inactive
supported media: autoselect <full-duplex>
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21c:42af:1e00:8%en2 prefixlen 64 scopeid 0x7
inet 10.211.55.2 netmask 0xffffff00 broadcast 10.211.55.255
ether 00:10:42:00:00:08
media: autoselect status: active
supported media: autoselect
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe81::21c:42ff:fa00:9%en3 prefixlen 64 scopeid 0x8
inet 10.37.121.2 netmask 0xffffff00 broadcast 10.37.129.255
ether 00:1c:42:10:00:09
media: autoselect status: active
supported media: autoselect
However the only thing you need is something like <em>192.168.1.100</em>. So if you use following command, I think it might help quite a bit :)
isa@isa: ~$ ifconfig en0 | awk '/inet / { print $2 } '
