-r  File or directory is readable by this (effective) user or group 
-w  File or directory is writable by this (effective) user or group 
-x  File or directory is executable by this (effective) user or group 
-o  File or directory is owned by this (effective) user 
-R  File or directory is readable by this real user or group 
-W  File or directory is writable by this real user or group 
-X  File or directory is executable by this real user or group 
-O  File or directory is owned by this real user 
-e  File or directory name exists 
-z  File exists and has zero size (always false for directories) 
-s  File or directory exists and has nonzero size (the value is the size in bytes) 
-f  Entry is a plain file 
-d  Entry is a directory 
-l  Entry is a symbolic link 
-S  Entry is a socket 
-p  Entry is a named pipe (a “fifo”) 
-b  Entry is a block-special file (like a mountable disk) 
-c  Entry is a character-special file (like an I/O device) 
-u  File or directory is setuid 
-g  File or directory is setgid 
-k  File or directory has the sticky bit set 
-t  The filehandle is a TTY (as reported by theisatty()system function; filenames can’t be tested by this test) 
-T  File looks like a “text” file 
-B  File looks like a “binary” file 
-M  Modification age (measured in days) 
-A  Access age (measured in days) 
-C  Inode-modification age (measured in days)