Design and Implement a simple shell for Linux on our Lab machines. The shell should

1. Parse the command line
2. Create and execute a process for each command (and its arguments) on the command line. You need to support a minimum of three commands on the command line. A command is separated from the next by
   • a "|" indicating a pipe between the two commands
3. Support foreground and background processes
4. Support a ">" or "<" sign indicating I/O redirection to from a file
5. support a builtin command "exit" that quits the shell.

Graduate students will

• need to support multiple commands (more than three) on the command line, where one command feeds its output to the next in sequence. That is, you will need to support multiple pipes on the command line.
• support the ";" sequencing operator. A semicolon between two commands means: Do the first command, when the first command finishes, do the second command. Thus for graduate students a command is separated from the next by either a "|" or a ";"

The objective is to:

• Learn about an the Linux interface to application programs. Specifically learn about fork(), exec(), wait() dup(), and pipe().
• Learn about makefiles and software organization.
• Learn to find and read man pages

1. your source code files
2. a readme, and
3. a Makefile to make your executable.

Turn in your tarred, gzipped file by emailing it as an attachment to

You can run an executable that implements the needed parsing at

	% /cs/cs446/bin/shell
    

• Use of fork() and exec()
• Use of fork(), exec(), pipe(), and dup();