Program Requirements

The student shall create an application which will implement a command loop and

accept the commands defined by the following requirements.

The student shall implement the command execution routine to execute an external

command submitted to the shell program.

The command execution routine shall recognize a simple program name or an

absolute path.

The exec$()$ command shall be "int execv$($const char $*$path$,$ char $*$const argv$[])$;$"$

When a simple program name is used the program shall use getenv$($ "PATH"$)$ to

find the program location.

The student shall implement a separate program call myls$.$c which will display the

contents of a directory.

myls$.$c shall accept the $"-$a$"$ argument as an option as in the $"1s"$ command and

behave accordingly. No other option is required to be implemented.

The name of the program shall be $"$mysh$2",$ an abbreviation of $"$my shell". The

program must be written in $"C"$ and named $"$mysh$2.$c$.$

The name of the directory list program shall be $"$myls$".$ This program must be

written in $"C"$ and named $"$myls$.$c$".$

All programs shall be indented and formatted to be clearly readable.

The student is required to use the $"-$ansi" option to gcc for this assignment.

The student will "tar" the program. The tar command for the $"C"$ program is :

$ tar czf studentlastname$\_$mysh$2.$tgz mysh$2.$c myls$.$c