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4-25
file
filename access file file
creates a file object with specified filename and access. The access values are:
r open the file for reading only
w create a file if one does not already exist, or truncate and overwrite it if
it does exist. File is opened for writing only.
a create a file if one does not already exist or append it if it does exist.
File is opened for writing only.
r+ open the file for reading and writing. An undefinedfilename error
occurs if the file does not exist.
w+ create a file if it does not already exist, or truncate and overwrite if it
does exist. File is opened for reading and writing.
a+ 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
pattern proc scratchstring 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
proc procedure. This operator is in systemdict.
Errors: ioerror, stackoverflow, stackunderflow, typecheck
fileposition
file fileposition position
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.