Disk Full - need help deleteing junk

this linux box is full all of a sudden. had a power outage. it's job is to catch ftp files and send them along to a sql box. i can see in the ftp server directory 6.5m of disk use in a ?directory "." yeah just a period.
yup, i know very little about the unix flavors. what is this directory? how do i see whats in it?
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Pétur Ingi EgilssonSoftware Engineer -- ConsultantCommented:
the "." directory is your current directory.
Those files are probably hidden
do `ls -lah`to reveal them.

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