Re: Is there a list of all the environment variables?

[Marcus Müller]

Hi Alex!

Yep, cleaning up that, and documentating it is on my wishlist :)
So, two types of env variables:

1. gr::prefs configuration-file equivalents
2. "special" environment variables.

Re 1.: So, you might be aware of GNU Radio's preference management system: GNU 
Radio reads
and writes config files; (these are a bit fragile, because) there's multiple 
ways to
define the same configuration key, and one of these is setting an environment 
variable
that starts with GR_CONF; that's documented in [1][2].

Re 2.: Then, there's a couple of special environment variables that things are 
sensitive
against. GR_PREFS_PATH is relatively new, for example, and for reasons of 
causality can't
be covered by the preferences :)

GRC_BLOCKS_PATH is another older, but well-established environment variable 
(which can
actually be absorbed by the config system).

A grep for `getenv` tells me that's about it; of course, for example, most 
audio system
interfaces have their own trove of configurability, so do graphical frameworks 
(in our
case, X11, Qt), the typical linux runtime library loader listens to 
LD_LIBRARY_PATH and
various others and so on, but these are "global" sensitivities of libraries 
that GNU Radio
uses, not GNU Radio itself (I'm not sure knowing this helps the confused user, 
though...).

Best regards,
Marcus

[1] https://wiki.gnuradio.org/index.php/Configuration_Files
[2] formerly, in the doxygen docs under "Usage"

On 19.01.21 13:39, Alex Humberstone wrote:
> Dear Community,
> 
> Is there a list of all the environment variables used in GNU Radio somewhere? 
> I don't see
> anything in the documentation or in the wiki. There are a lot of obscure 
> variables such as
> $GR_PREFS_PATH and $GR_CONF_GRC_GLOBAL_BLOCKS_PATH, and I have no idea what 
> they all do.
> It would be really useful if they were all listed and documented somewhere. 
> Thanks in
> advance for the help!
> 
> Sincerely,
> Alex-M-Humberstone
> PhD Student
> Klipsch School of Electrical Engineering
> New Mexico State University (NMSU)
> Las Cruces, New Mexico, USA
>