Completed implementation of the Simple Shell Practical for University of Strathclyde's CS210 class (2022-2023). Created by Group 9.
cd <path>- Change working directory.getpath- Print system path.setpath <path>- Set system path.history- Print numbered list of commands in history, from least to most recent.!!- Invoke most recent command from history.!<no>- Invoke the command with number <no> from history.!-<no>- Invoke the command with the number of the most recent command minus <no> from history.alias- Print all set aliases.alias <name> <command>- Alias <name> to be interpreted as <command>.unalias <name>- Remove an associated alias.