-A Age of file in days since last access -B binary file -C age of file in days since last inode change -M Age of file in days since last modification -O Is the file owned by the real user ID? -R Is the file readable by the real user ID? -S if the file a socket? -T is it a text file? -W is the file writable by the real user ID or real group? -X is the file executable by the real user id or real group? -b is it a block speical file? -c is it a character special file? -d is the file a directory? -e does the file exist? -f is it a plain file? -g does the file hav the setgid bit set? -k does the file have the stick bit set? -l is the file a symbolic link -o is the file owned by the effective user id? -p is the file a named pipe? -r is the file readable by the effective user id? -s returns the size of a file, with zero referring to an empty file -t is the filehandle opened by a TTY(terminal)? -u does the file have the setuid bit set? -w is the file writable by the effective user or group ID? -x is the fie executable by the effective user or group ID? -z is the file size zero?