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Created a shell interpreter with features similar to ones in bash or csh.

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nyoungstudios/shell-project

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My Shell Project

My shell project that I created for the Systems Programming class at Purdue. Got over 100% on this project.

Features

  1. Features specified in the handout that work.
    Everything works including:
    Parsing and executing commands
    File redirection >, >>, <, >&, and >>&
    Pipes |
    isatty()
    Ctrl+C
    Zombie Elimination
    Exit the shell
    Quotes "" and ''
    Escaping special characters \
    Builtin Functions (printenv, setenv, unsetenv, source, cd)
    Source .shellrc file
    Source with environment variables
    Subshells $()
    Process substitution
    Environment variable expansion ${}
    Tilde expansion (~)
    Wildcarding (*, ?)
    Edit mode (arrow keys, Ctrl+D for delete, Ctrl+H for backspace, Ctrl+A for home, Ctrl+E for end)
    History up and down arrow keys
    Editing history commands
    Variable prompt

  2. Features specified in the handout that do not work.
    Nothing

  3. Extra features I have implemented.
    cd - . This returns to the last directory the user was in before the current directory. Also updates PWD and OLDPWD environment variables for all cd commands.
    $?, $_, $SHELL, $anything. Extra environment variable parsing without the curly brackets like zsh.
    Error statement if command not found

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Created a shell interpreter with features similar to ones in bash or csh.

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