0x16. C - Simple Shell

Description

This project is an implementation of the shell created as a Milestone Project for the C code at ALX Africa Software Engineering. The shell is a project in the first trimester, that helps student to understand the advanced concepts behind the shell program include process, system call, bit manipulation, file management, error handling etc.... Shell is a simple UNIX command interpreter that replicates functionalities of the simple shell (sh). This program was written entirely in C Language.

Requirements

General

• Allowed editors: vi, vim, emacs
• All your files will be compiled on Ubuntu 20.04 LTS using gcc, using the options -Wall -Werror -Wextra -pedantic -std=gnu89
• All your files should end with a new line
• A README.md file, at the root of the folder of the project is mandatory
• Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl
• Your shell should not have any memory leaks
• No more than 5 functions per file
• All your header files should be include guarded
• Use system calls only when you need to (why?)
• Write a README with the description of your project
• You should have an AUTHORS file at the root of your repository, listing all individuals having contributed content to the repository. Format, see Docker

Features

• This program displays a prompt and waits for the user to types a command. A command line always ends with a new line (when user push ENTER key).
• The prompt is displayed again each time a command has been executed.
• The user could stop the program using Ctrl+D (end of file).
• The shell handles the command lines with arguments and pathways.
• The program prints the current enviroment when the user types env.
• The shell handles the setenv and unsetenv builtin commands
• This program executes the most common shell commands as ls, cd, pwd, rm, cp, mkdir, rmdir, exit, env, etc... with arguments.
• If an executable cannot be found, It prints an error message and displays the prompt again.
• This Shell supports commentaries using #,
• The Shell Handle the $? variable and $$ variable.
• This shell support shell logical operators as && or ||, and commands separator ;.
• The shell handle the alias builtin command
• When the user enters exit, the shell will end.

Compilation

This shell is compiled this way:

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