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                       _____ _   _ _____    ____    _  _____ _____ ____     ___  _____ 
                      |_   _| | | | ____|  / ___|  / \|_   _| ____/ ___|   / _ \|  ___|
                        | | | |_| |  _|   | |  _  / _ \ | | |  _| \___ \  | | | | |_   
                        | | |  _  | |___  | |_| |/ ___ \| | | |___ ___) | | |_| |  _|  
                        |_| |_| |_|_____|  \____/_/   \_\_| |_____|____/   \___/|_|    

                                       ____  _   _ _____ _     _     
                                      / ___|| | | | ____| |   | |    
                                      \___ \| |_| |  _| | |   | |    
                                       ___) |  _  | |___| |___| |___ 
                                      |____/|_| |_|_____|_____|_____|
                                                                      

HSH: The Holberton Shell

The gates of shell is a Holberton School project in the first trimester, helps student to understand the advanced concepts behind the shell program include process, system call, bit manipulation, file managment, error handling ...

Genreral

• 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”?

Features

• Display a prompt and wait for the user to type a command. A command line always ends with a new line.
• If an executable cannot be found, print an error message and display the prompt again.
• Handle errors.
• Hndling the “end of file” condition (Ctrl+D)
• Hanling the command line with arguments
• Handle the PATH
• Support the exit features and the exit status
• Handle the Ctrl-C to not terminate the shell
• Handling the command seperator ;
• Handling && and || logical operators
• Handle variable replacements $? and $$
• Handle the comments #
• Support the history feature
• Support the file input

Builtins

• The exit builtin exit [STATUS]
• The change directory cd [DIRECTORY] | [OPTION]
• Display the environnment variables env
• Initialize a new environnment variables or created if not match setenv [VARIABLE] [VALUE]
• Remove an environnment variable unsetenv [VARIABLE]
• Support the aliases alias [name [='value'] ...]
• Display help help [BUILTIN]
• Display history history

Authors

<<<<<<< HEAD Farid Hashimzada - Software developer - Linkedin /

Rashad Malikov - Software developer & linux system developer - [Linkedin](https://www.linkedin.com/in/Rashad Malikov/)

Simple Shell school project.