Unix Shell Implementation using C Multithreading

This is a Linux/Unix-like shell implemented in C. This shell supports 3 internal and 5 external commands with various options, executed via fork/exec or pthread/system function calls based on the user's preference. Commands can be run in parallel using threads, making this shell very efficient.

Features

Internal Commands

1. echo (prints the arguments provided)

• -n: No newline after execution.
• -E: Suppress backslash interpretation.

2. pwd (prints the current directory)

• -L: Do not ignore symbolic links.
• -P: Avoid symbolic links.

3. cd (changes the current directory of the process)

External Commands

1. ls (lists the directories in the current directory)

• -1: Print directories on new lines.
• -Q: Print directories in quotation marks.

2. date (prints the current date)

3. cat (displays the content of a file)

• -n: Display line numbers.
• -e: Display $ at the end of each line.

4. rm (removes a file)

• -i: Ask for confirmation before removal.
• -v: Display the status of removal.

5. mkdir (creates a new directory)

• -v: Display the status of directory creation.

Instructions

1. Clone the repository:

   git clone https://github.com/notkartikye/unix-shell.git
   cd unix-shell

2. Build the project:

   make build

3. Clean the build files:

   make clean

4. Run the shell:

   ./shell

Example:

./shell

> echo Hello, World!
Hello, World!

> ls -l
directory1
file1.txt
file2.txt

> date
Mon Apr 20 00:04:20 UTC 2022

> cat -n example.txt
1    This is an example file.
2    It has multiple lines.