SimpleShell

CS333 - Introduction to Operating Systems | Ho Chi Minh University of Science - VNU.

Spring 2020 Course

PROJECT #2: Build a simple shell on Linux: Simple commands with child processes, IO redirect & pipe.

(Checkout the #1 project here)

Author:

• 1751064 - Nguyen Hoang Gia
• 1751063 - Pham Bao Duy

Prerequisite

• Ubuntu / Linux. (Recommended Ubuntu 18.04)
• Download or clone the project.
• Install essential components by running:

sudo apt-get install build-essential

• Change directory to the project folder.

Install: Compile the C file into output and runnable

• Compile through Makefile, run

make

• Run the shell

./simple-shell

SimpleShell commands and features

1. Single command

• List sub-folder & sub-item

ls

• Current directory

pwd

• Ping website

ping -i 5 -w 10 -W 10 google.com

• ...

2. Check history of run commands

• Using double exclamation mark "!!" for checking history

!!

3. Concurrent commands

• Add an ampersand mark after the command with whitespace required.

ping -i 5 -w 10 -W 10 google.com &

4. I/O redirection

• Redirect the output of a command to a file and input from a file to a command.

ls > myFile.txt
cat < myFile.txt

5. Communication via a Pipe

• Output of one command to serve as input to another using a pipe.
• For example: list sub-folder and sub-item in current directory, just display which has character "a" in the name.

ls | grep a