Introduction - If you have any usage issues, please Google them yourself
Application of UNIX s fork () system call, etc., to prepare a c program has the following features: a) the realization of the basic functions of Shell, including: print prompt accepted and analysis of the command line (least squares void spaces, tab symbols, as well as for Bank address, etc.) the implementation of the command (must be an error processing enter exit or quit bye) return to the parent process b) procedures for dealing with the background (no wait) c) to deal with multi-line command (command-line analysis of the and to deal with of) d) Application of dup (), pipe () system call with input and output redirection and pipes function