Meaning of the shell status Test expression

Linuxshell status Test expression meaning file Test-d Directory-s file length is greater than 0, non-empty-f regular file-w writable-L symbol connection-u file suid bit settings-r readable -x executable-nt test file1 compare to linux shell status Test expression meaning file Test-d Directory-s file length greater than 0, non-empty-f regular file-w writable-L symbol the connection-u file has s u I d bit settings-r readable-x executable-nt test file1 is updated than file2. The modification date will be used for this comparison with the next comparison. -Ot test whether file1 is older than file2. -Ef tests whether file1 is a hard link to file2. Numerical test-the eq value is equal. -The ne values are not equal. -The first number of gt is greater than the second number. -Lt: The first number is smaller than the second number. -The first number of le is less than or equal to the second number. -The first number of ge is greater than or equal to the second number.