Assignment 3 (7.5 marks)
<标题>Due 11:59pm Sunday May 17, 2015.
The aim of this assignment is to write a simple shell interpreter demonstrating you knowledge of process
control. In addition to this you will get some experience with file system API’s.
<标题>Task One (4.5 marks)
You first task is to write a simple shell interpreter, which executes commands. You shell interpreter should
display a $ prompt and wait for user input.
<标题>You shell interpreter is to be a little simplistic, all you can do is execute commands. If a command cannot be
<标题>found you should display a suitable error message. When executing a command the shell interpreter should
<标题>wait until the command terminates. To implement command execution simply use the function call fork()
<标题>and exec(). Note that there are many variations on the exec() function call. To block the shell, you
should use the wait() (or similar) function call.
<标题>At the end of this step you should be able to do this:
./foobar does not exist.