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file-exists? checks if its argument string names
a file. delete-file deletes its argument file.
These procedures are not part of the Scheme standard,
but are available in most implementations. These
procedures work reliably only for files that are not
directories. (Their behavior on directories is
dialect-specific.)
file-or-directory-modify-seconds returns the time when its
argument file or directory was last modified. Time is
reckoned in seconds from 12 AM GMT, 1 January 1970.
Eg,
(file-or-directory-modify-seconds "hello.scm")
=> 893189629
assuming that the file hello.scm was last messed with
sometime on 21 April 1998.
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