TEST Operators: Files

Operator 	 Tests Whether                        	 
-e       	 File exists                          	 
-f       	 File is a regular file
-d       	 File is a directory                  	 
-h       	 File is a symbolic link              	 
-L       	 File is a symbolic link              	 
-b       	 File is a block device
-c       	 File is a character device           	 
-p       	 File is a pipe                       	 
-S       	 File is a socket                     	 
-t       	 File is associated with a terminal
-N       	 File modified since it was last read 	 
-O       	 You own the file                     	 
-G       	 Group id of file same as yours       	 
-s        	 File is not zero size                         
-r        	 File has read permission                     
-w        	 File has write permission
-x        	 File has execute permission
-g        	 sgid flag set
-u        	 suid flag set
-k        	 "sticky bit" set
F1 -nt F2 	 File F1 is newer than F2 *
F1 -ot F2 	 File F1 is older than F2 *
F1 -ef F2 	 Files F1 and F2 are hard links to the same file *

* Binary operator (requires two operands).
! NOT (inverts sense of above tests)