• Who designed and implemented the original Unix operating system
• Who wrote the first version of the UNIX shell
• Who invented the B programming language (the direct predecessor to the C programming language)
• Who is Ken Thompson
• How does a shell work
• What is a pid and a ppid
• How to manipulate the environment of the current process
• What is the difference between a function and a system call
• How to create processes
• What are the three prototypes of main
• How does the shell use the PATH to find the programs
• How to execute another program with the execve system call
• How to suspend the execution of a process until one of its children terminates
• What is EOF / “end-of-file”?

• execve
• exit
• fork
• free
• getline
• isatty
• open
• perror
• stat
• strcat
• strchr
• strcmp
• strdup
• strtok
• va_arg
• va_end
• va_start
• wait

gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o hsh

./hsh - example fix

• AUTHORS : List of contributors
• man_1_simple_shell : Manual page of the simple shell
• main.c : Function that contains the main code; coordinates the execution of programs and alternate between interactive and non-interactive shell modes
• main.h : Header file
• builtin_checker.c : Builtin checker file
• commandPATH.c : File that handles the PATH
• `fordandReplace.c~ : File that forks
• getend.c : getenv file
• helperfunc1.c : helper functions file
• `read.c~ : read file
• tokenizer.c : Tokenizer file

Wiki | (https://en.wikipedia.org/wiki/Unix_shell)

Wiki | (https://en.wikipedia.org/wiki/Thompson_shell)

Wiki | (https://en.wikipedia.org/wiki/Ken_Thompson)

Medium | (https://towardsdev.com/unix-shell-command-line-interpreter-in-a-nutshell-6bc91466a83f)

SLACK 👁️‍🗨️ | (https://slack.com/signin#/signin)

🆗☮️👨‍💻💕👩‍💻🏳️‍🌈🧑‍💻 OKLAHOLBIES | (https://holbertontulsa.com/)

Clint Hendrickson | (https://github.com/Maitreya-today)

Mason Counts | (https://github.com/spindouken)