is_file
is_file — determines if a file exists.
is_file (path)
path
A character string defining a file path and file name in this file system.
t if the named file exists and is a regular file, otherwise nil.
t
nil
Gamma> is_file("/usr/doc/FAQ/txt/FAQ"); t Gamma>
Gamma>
is_file("/usr/doc/FAQ/txt/FAQ");
is_dir