File checking in Perl

A list of checking you can perform on a file in perl
Commanly used checks are in Bold Font
-r      File is readable by effective uid/gid.
-w      File is writable by effective uid/gid.
-x      File is executable by effective uid/gid.
-o      File is owned by effective uid.
-R      File is readable by real uid/gid.
-W      File is writable by real uid/gid.
-X      File is executable by real uid/gid.
-O      File is owned by real uid.
-e      File exists.
-z      File has zero size (is empty).
-s      File has nonzero size (returns size in bytes).
-f      File is a plain file.
-d      File is a directory.
-l      File is a symbolic link.
-p      File is a named pipe (FIFO), or Filehandle is a pipe.
-S      File is a socket.
-b      File is a block special file.
-c      File is a character special file.
-t      Filehandle is opened to a tty.
-u      File has setuid bit set.
-g      File has setgid bit set.
-k      File has sticky bit set.
-T      File is an ASCII text file (heuristic guess).
-B      File is a "binary" file (opposite of -T).
-M      Script start time minus file modification time, in days.
-A      Same for access time.
-C      Same for inode change time (Unix, may differ for other platforms)