Discussion Section for Sept. 27, 2012: Mini-Shell

In Discussion Section

Implement a mini-shell that does the following:

• prompt the user for input by writing a $ ,
• exits on exit,
• changes directory on cd XXX, where XXX may be any directory, and
• run every other command as a program via system()

You can assume everything will be lower case (eg: exit will always be exactly exit), all commands will not have any extra whitespace, and all arguments to a command will be seperated by exactly one space.

Compiling and Running

To compile and run your shell, run the following commands from a Terminal on a Linux machine:

$ make
$ ./mshell

Example

Consider the following example run of your shell:

$ ls
Makefile mshell mshell.c
$ pwd
/home/wfagen2/cs241svn/wfagen2/ds3
$ cd ..
$ ls
ds1 ds2 ds3 hw1 mp1 mp2 mp3
$ pwd
/home/wfagen2/cs241svn/wfagen2
$ echo hello world
hello world
$ exit