is_writable -- determines if a file is writable.
Arguments
- path
A character string defining a file
path and file name in this
file system.
Returns
t if the named file exists and is writable, otherwise nil.
Example
Gamma> is_writable("/usr/doc/FAQ/txt/FAQ");
nil
Gamma> is_writable("/home/robert/w/devel/lisp/mytestfile.dat");
t
Gamma>