Introduction - If you have any usage issues, please Google them yourself
linux environment, to achieve the shell interpreter to realize functions are: 1 basic interface to the input prompt at the beginning 2. run the executable file, including parameters of 3 error 4 built-in simple shell command cd exit 5. Single I/O redirection> < 6 single pipe | 7. running in the background & 8 in order to execute multiple commands