Shell Implementation in C

A custom Unix shell implementation built from scratch in C as part of the CodeCrafters challenge.

Features

• Built-in Commands

  • exit - Terminate the shell
  • echo - Print text to stdout
  • type - Display command type information (builtin vs external)

• External Command Execution

  • PATH resolution for executable lookup
  • Process forking and execution via fork() and execv()
  • Child process management with waitpid()

• Command Discovery

  • Searches $PATH environment variable for executables
  • Validates file permissions before execution

Technical Implementation

• Written in C23
• Uses POSIX system calls (fork, execv, waitpid)
• Implements custom PATH traversal algorithm
• Handles process lifecycle management

Building & Running

./your_program.sh #Build and run the shell

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