NooooSH

A simple shell created using C

NooooSH is a simple shell made using C with low level Linux system calls for OSN Course Monsoon 2021 . Some of its basic functionalities are

Common commands like cd,ls ...
Piping and Redirection
Shell specific commands (will be mentioned in detail later)

Downloading and Running

To download and run the shell ,

git clone https://github.com/meagoodboy/NooooSH.git
cd NooooSH
make
./noooosh

or if you have already downloaded the folder containing the shell files, go to that folder ,

make noooosh
./noooosh

if the shell is not running or ,if the history is not being initialised on running the shell, it is recommended to remove the old history file present in var/tmp and also the old excecutable of the shell

rm -rf noooosh /var/tmp/shell_history.txt

Commands

These are the few inbuilt commands in the NooooSH:

ls [-l -a] - to display the files and folders.
cd - to change the current working directory.
echo - To print text on the shell.
pwd - to print the current working directory
history - to print the previous commands used
jobs [-r -s] - to print the active background jobs in the shell
repeat - repeats a command
replay [-command -period -interval] - runs a command after very interval until the given period
fg - brings a background process to foreground given the process id
bg - changes the state of the background process to running given the process id
sig - sends the given signal to the given process id
pinfo - prints the information of the process given the process id

Other features

Piping
Redirection
Running of background process and foreground process (inbuilt and other linux commands)
signal handling for ctrl+c, ctrl+z, ctrl+d

File structure

The main runninng code of the shell is present in the file shell.c. And all the header files , global variables , global functions are defined in the header file shell.h. Each basic command has a file named .c where the functions needed for running the command is stored. All the functions present in the commands folder is defined in the header file called commands.h. and its is imported to shell.c for the usage

meagoodboy / NooooSH