Figure out the current runlevel of your system.
Surprise, surprise :) You need the following command:
$ runlevel # command N 2 # sample output
“The previous and current runlevel from that record are output separated by a single space. If there is no previous runlevel in the record, the letter N will be substituted.”
So, in my case the current runlevel is 2. It means I can check the startup scripts in the directory