Shell inside if condition judgment

[-A file] is true if file exists.

[-B file] True if file exists and is a block special file.

[-C file] True if file exists and is a word special.

[-D file] 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.

[-H file] True if file exists and is a symbolic connection.

[-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.

Shell inside if condition judgment