[GENERAL] lock and socket file

[Sahagian, David]

Using Postgres 9.1

(1)
Simulate a "power failure" by hitting "Restart" on my VMware Workstation.

(2)
Turn on the VM (without any script removing lock or socket file).

(3)
Try to start postgres.
$ pgsql/bin/pg_ctl start -D pgdata
server starting
2013-01-14 FATAL:  lock file "/tmp/.s.PGSQL.5432.lock" already exists
2013-01-14 HINT:  Is another postmaster (PID 2770) using socket file 
"/tmp/.s.PGSQL.5432"?


So to be able to start Postgres . . .
In our "vm startup script", should we remove only the [.s.PGSQL.5432.lock] file 
?
Or should we also remove the [.s.PGSQL.5432] file ?

Thanks,
-dvs-