File Tests

If you want to test whether you can write to a file or if a direcory exists,
this may help a little when writing clean scripts with appropriate error messages

So here is a little collection of the most common file test operators in Perl:

File Test Operators
 
Test 	Meaning
 
-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
 
 
Test 	Meaning
 
-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)
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