Re: (feature change request) remove link-layer generated routes from netstat -r

On 2006-02-23 12:14, Gary Corcoran <gcorcoran@xxxxxxx> wrote:
John Baldwin wrote:
On Thursday 23 February 2006 02:56, Nikos Vassiliadis wrote:
On Thursday 23 February 2006 07:06, Eugene Grosbein wrote:
On Wed, Feb 22, 2006 at 03:50:17PM +0200, Nikos Vassiliadis wrote:
netstat -r prints link-layer generated routes and many
times the output becomes somehow obscure. For
example:

root@brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat# netstat
-ranfinet Routing tables

Internet:
Destination Gateway Flags Refs Use Netif
Expire default 10.1.1.244 UGS 0 31016
rl0 10.1.1/24 link#1 UC 0 0 rl0
10.1.1.181 00:0f:1f:fb:02:f5 UHLW 1 0 rl0
10.1.1.182 00:e0:fc:38:d4:40 UHLW 1 0 rl0
10.1.1.183 00:e0:fc:65:07:fd UHLW 1 0 rl0
10.1.1.244 00:50:fc:fe:74:3b UHLW 2 1 rl0
10.1.1.254 00:0c:cf:70:50:06 UHLW 1 0 rl0
127.0.0.1 127.0.0.1 UH 0 1117 lo0
192.168.1 link#5 UC 0 0 fxp0
192.168.1.25 00:05:5d:4d:19:58 UHLW 1 0 fxp0
192.168.1.45 00:11:43:b6:a1:55 UHLW 1 0 fxp0
192.168.1.71 00:0c:f1:b9:38:50 UHLW 1 1645 fxp0
192.168.1.84 00:04:23:af:79:66 UHLW 1 0 fxp0
192.168.1.112 00:30:4f:21:3b:8a UHLW 1 0 fxp0
192.168.1.196 00:07:e9:40:1f:c5 UHLW 1 0 fxp0
192.168.1.199 00:e0:81:21:28:21 UHLW 1 0 fxp0
192.168.1.200 00:30:4f:03:88:03 UHLW 1 0 fxp0


when the information I was actually looking for is:

root@brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat# netstat
-rnfinet
Routing tables

Internet:
Destination Gateway Flags Refs Use Netif
Expire default 10.1.1.244 UGS 0 31016
rl0 10.1.1/24 link#1 UC 0 0 rl0
127.0.0.1 127.0.0.1 UH 0 1117 lo0
192.168.1 link#5 UC 0 0 fxp0
root@brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat#


The attachment patch ("cvs diff -u -rHEAD route.c" generated) prints
link-layer generated routes when -a is specified and ignores them
the rest of the time.

Thoughts? POLA violation?
Just use:

netstat -rn | awk '$3 !~ /L/ { print }'
That's exactly the point Eugene, I don't want to find ways to filter it
out.
It happens frequently. I didn't say it's difficult to remove it, I just
don't want it there all the time. That's why you can use -a to get the old
behavior.

Using simple pipelines with awk and sed, etc. is the UN*X way though.
Instead
of building all-singing all-dancing programs you build simpler utilities
that
you "glue" together to build more complex behavior.

Yes, when you want do do something "complicated", which doesn't belong
in a single program, that's the way. But IMO that doesn't apply here.
I agree with Nikos. He just wants to limit the often-useless (to most
users) output which is *already* in the program. Just providing a
simple command line option to get back the full output, if ever
needed, seems like a good, simple solution, to make things easier for
us poor humans to scan. :)

How about making the new behavior non-default, i.e. toggled by a -s
switch to the netstat -r command?

% netstat -rs

Then 's' can stand for 'short' output, and everyone can experiment with
the new feature. Then, after a couple of minor releases, if we find
that this is a feature that is very often used, we can make it the
default.

- Giorgos

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