sbang002 / rshell

rshell is a shell used to run commmands and connectors

Project Created By:

• Se Hoon Bang
• Kenneth Siu

rshell

rshell is a shell used to run commands and connectors

Features

Executables

Run any comands, besides cd, such as ls, pwd, echo, etc.
e.g.: ls will list the contents of the current directory Run "exit" to exit rshell.

Connectors

Use connectors, such as ||, &&, and ; to connect commands however you like.
e.g.: (a && b || c) will run ((a && b) || c) instead of (a && (b || c)))

Comments

Use # to commment out any part of a command.
e.g.: echo hello world # hello world is printed, but this is not!

Implementation

The project consisted of several steps.

• We got the user input using getline, and parced it into three different vectors - executables, arguments, and connectors.
• We called execvp with the executable (and argument) as parameters.
• We checked whether or not the executable (and argument) was valid and if it was, ran it.
• We had a function to check whether or not the next executable should be run depending on the connectors.
• We had another function which calculates the proper grouping of commands. (e.g.: if we ran a && b || c, it should run ( (a && b) || c ) instead of ( a && (b || c) )).
• We put the whole thing into a while loop so that it would run unless the executable entered is "exit" in which it would then exit the rshell.
• We tested the rshell by outputting our expected output, followed by outputting our actual output.

Possible Bugs & Future Updates

The cd command has not been implemented.