rshell

Collaborating Students

Michael Pare
Tommy Shiels
Ryan Ulep

Coding Specifications

This program acts as a command shell and performs the following:

1. Prints a command prompt.
2. The programs run until exit is read in on the command line.
3. The rshell can handle precedence operators, (echo A && echo B) || (echo C && echo D).
4. The rshell can execute test operations in either of the following formats: test -e Makefile and [ -e Makefile ].
5. Reads in a command on one line. These commands take the form:

cmd = executable [argumentList] [connector cmd]
connector = || or && or ;

Note this program can take more than one command on a line and can be separated by connectors. There are no limits to the number of commands which can be chained together, and any combination of operators can be handled.

Known Bugs

1. The following command structure causes an error: [some test] connector (a precedence).
2. when entering a invalid directory as an argument several times for cd it will interfere with the PWD and OLDPWD variables