[GENERAL] Insert data with greek characters using psql environment

[ΑΠΟΣΤΟΛΟΣ ΛΕΛΕΝΤΖΗΣ]

Hello,

I am a new user of PostgreSQL , and i have a problem with encoding settings
of psql.
Specifically, i want to insert data with greek characters using psql
environment.
I change the enconding settings of psql, writing the following command:
*SET CLIENT_ENCODING TO 'UTF8';*
but i can't insert my data!!
Can you help me??

Thanks,
Apostolis