Small Shell

A shell in C. It implements a subset of features of bash.

Features

1. Use Unix process API to create and manage processes.
   • fork() to create a new create process
   • execvp() to run a different program that is the user input command
   • waitpid() to check for the termination of the child process, and clean up resources from child processes
   • getpid() to get the process id
   • getenv() to get environment variable
2. Support input and output redirection using dup2() system call
3. Switch between foreground-only and foreground-and-background
4. Expand any instance of "$$" in a command into the process ID
5. Implement custom handlers to override 2 signals, SIGINT and SIGTSTP
6. Used valgrind to ensure memory-leak free