Returns true iff the file named filename actually exists. This function is defined on arbitrary path values: for URI values we open a URLConnection and invoke getLastModified().

Returns true iff the file named filename actually exists and is a directory. This function is defined on arbitrary path values; the default implementation for non-file objects is to return #t iff the path string ends with the character ‘/’.

Returns true iff the file named filename actually exists and can be read from.

Returns true iff the file named filename actually exists and can be writen to. (Undefined if the filename does not exist, but the file can be created in the directory.)

Delete the file named filename. On failure, throws an exception.

Renames the file named oldname to newname.

Copy the file named oldname to newname. The return value is unspecified.

Create a new directory named dirname. Unspecified what happens on error (such as exiting file with the same name). (Currently returns #f on error, but may change to be more compatible with scsh.)

Return the name of the default directory for temporary files.

Return a file with a name that does not match any existing file. Use format (which defaults to "kawa~d.tmp") to generate a unique filename in (system-tmpdir). The current implementation is not safe from race conditions; this will be fixed in a future release (using Java2 features).