khannatanmai / os-shell-assignment

This is a bash-like shell made using C

Operating Systems

Assignment 2

Problem Statement: Create a bash-like shell using C

Team Members:

Aamir Farhan (20161078)

Tanmai Khanna (20161212)

Info about the shell:

• To run the shell, run the command make and then ./shell.

• The shell has a prompt in front of which you can enter your commands.

• There are some builtin commands which have been coded into the shell. These are:

  • echo <string>: Anything you write after it will be printed onto the shell.
  • cd: Any path you enter after this, the shell takes you to that directory. cd and cd ~ take you to the home directory.
  • pwd: Gives you the present working directory.
  • ls: This command is used to display all the files in the current directory. ls -l gives you the list of files along with info about file permissions, author, last modified time, etc. ls -a includes hidden files in the display. You can use any combinations of flags, such as ls -a -l/ls -l -a/ls -al/ls -la.

• Any other commands you enter, will run as processes if they exist.

• If you put an at the end of your command, (eg. emacs & or gedit&) it runs the process in the background and the shell continues to take inputs. If you do not include an &, the process runs in the foreground and the shell becomes inaccessible until this process closes.

• pinfo <pid> gives you information about the process id that you enter in the command. Just pinfo gives information about our shell program.

• Enjoy the Shell! ^_^