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ash Shell

This shell was written for Fall 2020 - Operating Systems course in C++.

Build Instructions

  1. navigate to project folder ./ash
  2. run make -f makefile or simply make to compile the code.
  3. run ./ash
  • note that the code utilises the GNU readline library for history and reading command input.

Features

  • prompt message with current working directory
  • pipelining multiple commands
  • support for various built-in commands (see Built-in Commands)
  • common aliases such as ls --color=auto and df -h
  • a history of recent commands
  • conversion of ~/ to $HOME/
  • parameter passing
  • inter-process communication using shared memory between shells
  • batch mode and interactive mode
  • ctrl+D termination and ctrl+C abortion

Built-in Commands

  • help displays a help screen with a list of available commands
  • cd [path] changes directory, supports ~/
  • pwd prints workings directory in colour
  • shid prints the shell id assigned by user
  • send [shid] [message] sends a message to the other terminal
  • receive reads all unread messages from the other terminal
  • clear clears terminal output
  • history prints a history of recent commands
  • quit leaves the terminal (with a message)

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