POSIX-Based Shell

A small Unix-style shell written in C for Linux. The shell implements command parsing, process creation, foreground/background execution, signal handling, built-in commands, and circular-buffer command history.

Features

• Reads user input using read()
• Executes programs using fork(), execvp(), and waitpid()
• Supports foreground process execution
• Supports background execution using &
• Handles SIGINT so Ctrl-C does not kill the shell itself
• Reaps completed background processes with waitpid(..., WNOHANG)
• Supports built-in commands:
  • cd
  • exit
  • history
• Implements circular-buffer command history
• Supports command recall:
  • r recalls the most recent command
  • r x recalls the most recent command starting with x

Build

make

Run

./build/minishell

Test

make test

Clean

make clean

Tech Stack

C, Linux, POSIX, process management, signals, Make, Git