Bash [[ ... ]] Operators: Files

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)