Awk not ouputting results via echo

[Lester Anderson]

Hi Eliot,

I can see the logic of the function, but not sure how it is
implemented from the section I have:

lon_min=-12
lon_max=0
lat_min=28
lat_max=39
R_d=167
R_i=20

echo $lon_min $lon_max $lat_min $lat_max $R_d $R_i |
awk "{R_t=6370;
      pi=3.14159;
      lat_av=(($lat_max+$lat_min)/2)*(pi/180.);
      lon_av=(($lon_min+$lon_max)/2);
      d_lat_e=($R_d/R_t)*180./pi;
      d_lon_e=($R_d/(R_t*cos(lat_av)))*180./pi;
      d_lat_i=($R_i/R_t)*180./pi;
      d_lon_i=($R_i/(R_t*cos(lat_av)))*180./pi;
      lon_e_min=$lon_min-d_lon_e;
      lon_e_max=$lon_max+d_lon_e;
      lat_e_min=$lat_min-d_lat_e;
      lat_e_max=$lat_max+d_lat_e;
      lon_i_min=$lon_min-d_lon_i;
      lon_i_max=$lon_max+d_lon_i;
      lat_i_min=$lat_min-d_lat_i;
      lat_i_max=$lat_max+d_lat_i;
      print lon_e_min,lon_e_max,lat_e_min,lat_e_max,lon_i_min,lon_i_max,lat_i_min,lat_i_max,lat_av*180./pi,lon_av;
}" | read lon_e_min lon_e_max lat_e_min lat_e_max lon_i_min lon_i_max
echo $lon_e_min $lon_e_max $lat_e_min $lat_e_max $lon_i_min $lon_i_max
$lat_i_min $lat_i_max $lat_av $lon_av

Do you have an example function that shows the workflow? Sorry not an
awk/cygwin expert!

Thanks
Lester

On 23 November 2015 at 15:23, Eliot Moss <moss@cs.umass.edu> wrote:
> Ok, I think I have a sense of an underlying problem here.
>
> When you do:  ... | read v1 v2 ...
>
> The read executes in an inferior process, setting variables there.
> The process then exits and you have no bindings in the parent shell,
> which is where you want them.
>
> Maybe something like this would suit you better:
>
> myfunction() {
>   ... stuff using positional arguments $1, $2, etc.
> }
>
> myfunction $(awk blah ...)
>
> This take the output of the invocation of awk and puts it
> where $(awk ...) was, which will invoke myfunction with
> the line, parsing it into separate arguments (I believe).
>
> You could also capture the line using something like this:
>
> line="$(awk ...)"
>
> and then you can fiddle the result however you want, but I think that
> calling a function (or another script) is probably simpler here.
>
> Regards -- Eliot Moss
>
>
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