Simple Shell Project.

• Table of Contents
  • Description
  • Objectives
  • Output
  • Allowed Functions
  • Installation
  • Complilation
  • Authors
  • License

Write a simple UNIX command interpreter.

• Understand the following concepts:
  • 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”?

Example of error with sh:

$ echo "qwerty" | /bin/sh
/bin/sh: 1: qwerty: not found
$ echo "qwerty" | /bin/../bin/sh
/bin/../bin/sh: 1: qwerty: not found
$

Same error with your program hsh:

$ echo "qwerty" | ./hsh
./hsh: 1: qwerty: not found
$ echo "qwerty" | ./././hsh
./././hsh: 1: qwerty: not found
$

• access (man 2 access)
• chdir (man 2 chdir)</li>
• close (man 2 close)
• closedir (man 3 closedir)
• execve (man 2 execve)
• exit (man 3 exit)
• fork (man 2 fork)
• free (man 3 free)
• stat (__xstat) that(man 2 stat)
• lstat (__lxstat) (man 2 lstat)
• fstat (__fxstat) (man 2 fstat)
• getcwd (man 3 getcwd)
• getline (man 3 getline)
• kill (man 2 kill)
• malloc (man 3 malloc)
• open (man 2 open)
• opendir (man 3 opendir)
• perror (man 3 perror)
• read (man 2 read)
• readdir (man 3 readdir)
• signal (man 2 signal)
• strtok (man 3 strtok)
• wait (man 2 wait)
• waitpid (man 2 waitpid)
• wait3 (man 2 wait3)
• wait4 (man 2 wait4)
• write (man 2 write)
• _exit (man 2 _exit)
• isatty (man 3 isatty)
• fflush (man 3 fflush)

Clone this repository in your local machine

https://github.com/Soria-c/simple_shell.git

User gcc, with the command

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

Carlos Soria GitHub

Juan Carlos Garay GitHub

Simple_shell is open source.