Re: [caiman-discuss] Help with sed

Tue, 26 Oct 2010 08:21:17 -0700 

Un-garbled:
        ifconfig -a | sed -n '/BROADCAST.*IPv4/ {n;p;}'

If you specify all "up" IPv4 interfaces in the user's zone,
you could then use:
        ifconfig -au4Z | sed -n -e'/127.0.0.1/d' -e '/inet/{p;q;}

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On 10/25/10 17:55, Jack Schwartz wrote:

 Hi everyone.

I'm trying to do a sed one-liner but can't seem to get it to work...
I want to parse ifconfig -a output and print the line which follows the line with the regular expression of "BROADCAST.*IPv4". End goal is to get the IP Address and netmask of the first non-loopback IPv4 interface. 

So when I see this:
---
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 
    inet 127.0.0.1 netmask ff000000
e1000g0: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 3 
    inet 10.132.145.68 netmask fffffe00 broadcast 10.132.145.255
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1 
    inet6 ::1/128
e1000g0: flags=20002004841<UP,RUNNING,MULTICAST,DHCP,IPv6> mtu 1500 index 3
    inet6 fe80::223:18ff:fe72:3644/10
schwa...@jslaptop:~/test$ ifconfig -a | grep BROADCAST | grep IPv4
e1000g0: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 3 
---

I want to output this:
    inet 10.132.145.68 netmask fffffe00 broadcast 10.132.145.255

Everywhere I google I see that the following should work:
    ifconfig -a | /usr/bin/sed  -n '/BROADCAST.*IPv4/{n;p}'

but I get an error with /usr/bin/sed instead:
    sed: command garbled: /BROADCAST.*IPv4/{n;p}

More confusing to me is when I remove the {} I get too much output:
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 
    inet 127.0.0.1 netmask ff000000
    inet 10.132.145.68 netmask fffffe00 broadcast 10.132.145.255
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1 
    inet6 ::1/128
e1000g0: flags=20002004841<UP,RUNNING,MULTICAST,DHCP,IPv6> mtu 1500 index 3
    inet6 fe80::223:18ff:fe72:3644/10

(actually, this is all the lines except the one I am searching for)

When I run gnu sed, then it works.

ifconfig -a | /usr/gnu/bin/sed  -n '/BROADCAST.*IPv4/ {n;p}'
    inet 10.132.145.68 netmask fffffe00 broadcast 10.132.145.255

Questions:
1) Is using gnu sed a problem if this code is for an auto-installer project? 2) What am I doing incorrectly above? How do I "un-garble" the /usr/bin/sed command? 

    Thanks,
    Jack
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