GRANT ALL error

[vertigo]

Hello
I have database: base and user: vertigo.
When i log into that database from pgsql:
#psql base -U pgsql

and try to give user vertigo all righst:
base=# GRANT ALL ON DATABASE base TO vertigo\g
ERROR: parser: parse error at or near "base"
WHy ?

Thanx

[vertigo]

base=# GRANT ALL ON DATABASE base TO vertigo\g

i tried to:
GRANT ALL PRIVILEGES ON DATABASE base TO vertigo\g

but did not helped.