Lexmark C752 Technical Reference page 217

file
creates a file object with specified filename and access. The
open the file for reading only
create a file if one does not already exist, or truncate and overwrite it if
it does exist. File is opened for writing only.
create a file if one does not already exist or append it if it does exist.
File is opened for writing only.
open the file for reading and writing. An undefinedfilename error
occurs if the file does not exist.
create a file if it does not already exist, or truncate and overwrite if it
does exist. File is opened for reading and writing.
create a file if it does not exist or append it if it does exist. File is
opened for reading and writing.
This operator is in systemdict.
Errors: invalidfileaccess, ioerror, limitcheck, stackunderflow, typecheck,
undefinedfilename
Note: An undefinedfilename error occurs if the file does not exist.
filenameforall
lists all the files with names that match a specified pattern string, copies the
filename for each of these files into a specified scratch string, and calls a
specified procedure. This operator is in systemdict.
Errors: ioerror, stackoverflow, stackunderflow, typecheck
fileposition
indicates the current position on an open file. This operator is in systemdict.
Errors: ioerror, stackunderflow, typecheck, undefinedfilename
Note: An undefinedfilename error occurs if the file does not exist.
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PostScript
values are: