unix-shell-implementation

This is a fully function UNIX shell implementation written in C and C++. It parses commands through Lex and Yacc and executes those commands using execvp.

How it works

• Parse command using my builtin grammar. This is done by identifying tokens in Lex and constructing it using the grammar in Yacc.
• Identifying if there are any builtin commands, subshells commands, environment variables, etc. within the command before executing.
• Execute the command and setting error code, as well as, clean up for zombie processes.

Features

• Path completion
• Subshells
• I/O commands
• Environment Variables
• Line Editory
• Command History

How to run

• You can run it by cloning the repository, running make, and typing ./shell. However, I am still in the process of editing this repository, so it is preferrable to wait before downloading anything right now. In order to exit out of the shell, you just type exit.