Re: [gpsd-users] strange - currently only few satellites

[David J Taylor]

Dear David,

you can download the source from github:
https://github.com/hans-mayer/sat_usage
if there are any questions tell me.

// hans
==================================

Hans,

Many thanks for that that, most helpful!  What I actually need is a script 
(or whatever) which returns the number of satellites being used by gpsd for 
a fix and I'll use this as input to MRTG (likely via the SNMP pass 
mechanism).  Although I am completely unfamiliar with Linux shell commands, 
I've been able to simplify your script down to:

________________________________________
gpspipe -r | egrep --line-buffered  'GPGSA' | stdbuf -o0 gawk  '-F,' '
{
 CNT=0 ;
 if ( $1 ~  /GPGSA/ ) {
   for (i = 1; i <= NF; i++) {
     if ( $i != "" ) {
       # print ( $i ) ;
       CNT++ ;
     } ;
   } ;
   print ( CNT ) ;
 } ;
}'
________________________________________

which is near to what I need, with two exceptions:

1 - The script runs continuously.  What I need is just to get the current 
number of satellites and exit.  Run once, not every second.  Something like 
a "break" after printing the count.  My Linux knowledge isn't up to knowing 
how to do this!

2 - What I would like is also the number of satellites gpsd is actually 
using for a fix.  Comparing the script result with "cgps -s" for example, 
the value returned by the script is the total number of satellites in the 
right-hand cgps column, whereas I would also like the number of satellites 
with "Y" against them - satellites being used.  Perhaps this is more 
complex. though?

BTW: gawk isn't in the default Raspberry Pi Wheezy distribution, but easily 
obtained with apt-get.

Thanks,
David
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