Hi David,

> On 17. Aug, 2020, at 21:52, David Gauthier <davegauthie...@gmail.com> wrote:
> 
> 9.6.7 on linux

ok, 12.4 here, but anyway. Try this:

$ psql -v osuser=foo
psql (12.4)
Type "help" for help.

postgres=# \echo :osuser
foo

Cheers,
Paul

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