Shell v2 By Ineffable

Overview

The Shell_v2 repository contains files from my version of Shell, but a second version more advanced to Simple_shell, which is a UNIX shell based on bash and Sh. This is my command line version of the interpreter it is written in C language.

Kenneth Lane Thompson

He designed and implemented the original Unix operating system.

Description

This shell starts reading .hshrc and then optionally reads the first argument represented by a file and executes all internal commands. Then it prints a prompt and starts reading the commands. And what's more, it creates a history per command inserted.

Commands

Path commands

• Commands inside the path.

Built-in

Command	Description
env	Prints Environment
whoami	Display the effective user ID
clear	Clears the terminal screen
cd	Changes the working directory
pwd	Prints the name of the current working directory
exit	Exits the program with a status code
setenv	Set a value in the Environment
unsetenv	Unset a value in the Environment
history	Prints the command history
help	Prints the help manual
alias	Prints alias
PS1	Changes the prompt

Advance commands

• Redirections:
  • n> Right stream redirection (n is a file descriptor).
  • >> Double right stream redirection (Append).
  • < Left stream redirection.
  • << Heredoc (Double left stream redirection).
• Logical operators:
  • && Handle the AND logical operator
  • || Handle the OR logical operator
• Separator:
  • ; Handle the commands separator.
• Comments:
  • # Handle comments.
• Variables:
  • $? Status Code
  • $$ Currend PID(Process ID)
  • $variable Handles an Environment variable like $PATH
• Signal:
  • ^C Ctrl + C

Compilation

Usage: hsh

• Shell_v2 is started with the standard input connected to the terminal. To start, compile all .c located in this repository by using this command:

$ make all
$ ./hsh [File optional]

Example

#Cisfun:~/holbertonschool-shell_v2$ echo Hello ; echo World
Hello
World
#Cisfun:~/holbertonschool-shell_v2$ cd
#Cisfun:~$ cd /tmp
#Cisfun:/tmp$ pwd
/tmp
#Cisfun:/tmp$ cat -e << Heredoc
Hello
This is a document
Which is inserted into the standard input
to cat command with the e option
Heredoc
Hello$
This is a document$
Which is inserted into the standard input$
to cat command with the e option$

Author

Please, read the AUTHORS file