a probleme with postgresql

hello,
I have a probleme when i want start using postgresql (linux : corel linux
1.1), after a successful installation, when i go to /usr/local/pgsql/bin
i type ./psql  and i have like result:
welcome to psql  the postgresq interactive ........
Type \copyright .....
//   ..........
// ......


segmentation defaut????????
i can't use it after ????????
can you help me please .
thank you.