> How about using awk instead, [with explicit printf field widths to
> spread things out in case numbers are wider than their fields]

> Name  Mtu   Network       Address              Ipkts Ierrs    Opkts Oerrs Colls
> de0   1500  <Link>        00:00:c0:83:c3:e9 232673148     0 273729698     4     0

> On that system the above script produces the much more readable:

> 	Name          Ipkts  Ierrs      Opkts  Oerrs  Colls
> 	de0       232673278      0  273729835      4      0
> 	lo0        39483013      0   39483013      0      0

In case anyone cares, I long ago wrote a program designed specifically
to neaten up such output.  I called it halign, after TeX's \halign
operation.  For example...

% cat in
Name         Ipkts Ierrs     Opkts Oerrs Colls
de0       232673278     0  273729835     4      0
lo0       39483013     0  39483013     0      0
% halign l -m r < in
Name     Ipkts Ierrs     Opkts Oerrs Colls
de0  232673278     0 273729835     4     0
lo0   39483013     0  39483013     0     0
% halign l8 r10 r6 r10 r6 r6 < in
Name          Ipkts  Ierrs      Opkts  Oerrs  Colls
de0       232673278      0  273729835      4      0
lo0        39483013      0   39483013      0      0
% 

(the last halign specifies explicit minimum column widths matching the
printf format in the awk script given; unlike the awk script, if any of
the fields are too wide for the widths, that whole column will be
widened, rather than just that line).

The whole thing could be done with halign, actually, except that
netstat sometimes leaves the "Address" field completely blank.  If I
edit out the blank-address lines....

% cat in
Name  Mtu   Network       Address              Ipkts Ierrs    Opkts Oerrs Colls
le0   1500  <Link>        08:00:20:86:9a:35  3557815     1  3324719     0 24115
le0   1500  216.46.5/28   216.46.5.7         3557815     1  3324719     0 24115
le0   1500  fe80::/64     fe80::a00:20ff:fe  3557815     1  3324719     0 24115
le0   1500  10.0.2/24     10.0.2.7           3557815     1  3324719     0 24115
le0   1500  3ffe:b00:4020 3ffe:b00:4020:300  3557815     1  3324719     0 24115
lo0   32976 fe80::/64     fe80::1           54941043     0 54941043     0     0
lo0   32976 ::1/128       ::1               54941043     0 54941043     0     0
lo0   32976 127           127.0.0.1         54941043     0 54941043     0     0
% halign l8 x x x r10 r6 r10 r6 r6 < in | uniq
Name          Ipkts  Ierrs      Opkts  Oerrs  Colls
le0         3557815      1    3324719      0  24115
lo0        54941043      0   54941043      0      0
% 

So if you want to hack on netstat, you can just make the "Address"
field always nonblank (and pick up halign :-).

halign can be fetched by anonymous ftp from one of my house machines,
216.46.5.7, under /mouse/local/src/,
halign/halign-20020121/halign.{1,c} in particular.

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