VACCUM VERBOSE ANALYZE

Hello,

I would like to save in a file log from a "VACUUM VERBOSE analyze"
perform from psql.
I ve tried different ways :
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[USER(at)DBsrv] # psql -c'VACUUM VERBOSE analyze' > /home/log_vaccum
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the same command in a script without the '> /home/log_vaccum'
[USER(at)DBsrv] # vaccum.sh > /home/log_vaccum
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[USER(at)DBsrv]# psql
Welcome to psql 8.0.3, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit

DBsrv=# VACUUM VERBOSE analyze; \o /home/log_vaccum
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..... but no one worked :(

The log file is created but empty.

Does any one got an idea ?

Cheers

Cedric