simple_shell: A C repository from itz-hassan


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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”?

Getting HSH

In order to install the shell and get benefits of it's features you need to clone the current project, and compile it. You need to make sure that this shell tested and garantees work based on gcc-4.8 and the C90 standard.

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