Shell condition judgment

first, the numerical judgmentInt1-eq INT2 INT1 and INT2 two number equal true Int1-ne INT2 INT1 and INT2 two number of true int1-gt INT2 INT1 greater than INT1 for true int1-g e INT2 INT1 greater than or equal to INT2 true

Int1-lt INT2 INT1 Less than INT2 is true

Int1-le INT2 INT1 less than or equal to INT2 true second, the string judgment[-Z string] True if the length of the string is zero, that is, if the null is true, and [-N string] is true if the length of the string is nonzero, that is, the non-null is true; [STRING1 = STRING2] if two strings The same is true; [STRING1! = STRING2] True if the string is not the same; [STRING1] True if the string is not empty, similar to-n third, File/folder (directory) Judgment[-B file] True if file exists and is a block special file. [-C file] True if file exists and is a word special. [-D DIR] true if FILE exists and is a directory. [-E File] True if file exists. [-F file] True if file exists and is a normal file. [-G file] True if file exists and Sgid has been set. [-K file] True if file exists and the sticky bit has been set. [-P file] If file exists and is a name pipe (f if O) is true. [-R File] True if file exists and is readable.[-S file] True if file exists and the size is not 0. [-T FD] true if the file descriptor FD is open and points to a terminal. [-u file] True if file exists and suid (set user ID) is set. [-W file] True if file exists and is writable. [-X file] True if file exists and is executable. [-o file] True if file exists and is a valid user ID. [-G file] True if file exists and is a valid user group. [-L file] True if file exists and is a symbolic connection. [-N file] If file exists and has been mod if IED since it is last read is true. [-S file] True if file exists and is a socket. [File1-nt FILE2] If FILE1 have been changed more recently than FILE2, or if FILE1 exists and FILE2 does not is true. [File1-ot FILE2] If FILE1 is older than FILE2, or FILE2 exists and FILE1 does not exist, it is true. [File1-ef FILE2] True if FILE1 and FILE2 point to the same device and node number. Iv. complex logic judgment-A with-O or! Non -

Shell condition judgment