Redirect ERROR, FATAL and other messages

Hello!

I'm executing a postgres command from a C code, the command that I introduce
is the following:

"sudo -u pgsql psql -p 3306 -d triage_dump -c 'insert into control select
*from uuid ' > logfile"

In the logfile, the output is introduced, but certain lines are not, like
for example:
*ERROR:  duplicate key value violates unique constraint "control_pkey"
DETAIL:  Key (uuid)=(10000717) already exists.
could not find a "psql" to execute*

I understand the error messages, but I don't want them to appear in the
screen (stdout), is there any way to send this messages to a log file? I
need all messages from postgres goes to a logfile, but seems is not enough
with "> logfile"
Can somebody give me a hint to solve my issue?

Thanks in advance
Gabs

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