Linux test command details, linux test command details

Linux test command details, linux test command details

Test mark	Meaning
File name and type
-E	Whether the file name exists
-F	Whether the file name exists and is a file
-D	Whether the file name exists and is a directory
-B	Whether the file name exists and is a block
-C	Whether the file name exists and is a character device
-S	Whether the file name exists and is a socket File
-P	Whether the file name exists and is a FIFO (pipe) File
-L	Whether the file name exists and is a connection file
File Permission Detection
-R	Checks whether the file name exists and has the "readable" permission
-W	Check whether the file name exists and has the "writable" permission
-X	Checks whether the file name exists and has the "executable" permission
-U	Check whether the file name exists and has the "SUID" permission
-G	Checks whether the file name exists and has the "SGID" permission
-K	Check whether the file name exists and has the "Sticky bit" permission
-S	Checks whether the file name exists and is a non-blank file"
Comparison of Two files
-Nt	(Newer than) determine whether file1 is newer than file2
-Ot	(Older than) checks whether the file is older than file2.
-Ef	Determine whether file1 and file2 are the same file, which can be used to determine the hard link
Determination between numbers
-Eq	Equal
-Ne	Not equal
-Gt	Greater
-Lt	Less
-Ge	Greater than or equal
-Le	Less than or equal
Judge string data
Test-z string	Returns true if the string is null.
Test-n string	Determines whether the string is 0. If it is null, false is returned.
Test str1 = str2	Returns true if str1 is equal to str2.
Test str1! = Str2	Judge whether str1 is equal to str2. If it is equal, false is returned.
Multi-condition judgment
-	The two conditions are true at the same time. For example: test-r file a test-x file. If both conditions are true, true is returned.
-O	If any condition is true, for example: test-r file o test-x file, true is returned if both conditions are true.
!	Reverse status, such as test! -X file: returns true if file does not have x.