"file" in order to transfer image in class java or commando FTP

"file" in order to transfer image in class java or commando FTP

in the guide of postgresql.org, it is used in a class,
it "file"
to receive the file, that goes away to store like
image in the table
images.

that "file" out I do not understand that it command
talks about, if to
the one of a class of java, or a commando of FTP if I
have servant
FTP.


thanks

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