Goal: The purpose is to construct a user-defined interactive shell application capable of creating and managing new processes. The shell should be capable of launching a process from a system programme such as emacs, gedit, or any user-defined executable. The shell is built to meet a variety of criteria and requirements.
The user-defined interactive shell program that can create and manage new processes. The list of these are enclosed in the two PDF files.
functionality.pdf(Done as Assignment 2 in the course)extending_functionality.pdf(Done as Assignment 3 in the course)
headers.h: It includes library calls, global variable and structure declarations, and fixed size containers. This file is used by other files and stores their function declarations.main.c: Declares the initialization conditions for the entire terminal. Initiates the home state and accepts input.utility.c:File containing routines for altering input format, tokenizing input arguments depending on spaces, and deleting excess spaces from input.prompt.c: Displays the prompt in the terminal window in desired<username@system_name:curr_dir>format.cd.c: Code for manipulating terminal directories.echo.c: Code for printing arguments from the given input to the terminal in the appropriate format.ls.c: All files and folders are displayed based on flags and target directories. Depending on the path type, displays output in colour as well.pinfo.c: The shell program's process-related information is printed in the appropriate output format. For output, the files/proc/%d/statand/proc/%d/exeare used.discover.c: Custom discover command that mimics the fundamentals of the find command The command searches a directory structure for files. Contained code that handles flags and target directories that function recursively and print the desired output.history.c: Implements a 'history' command that is equivalent to the LINUX history command. The history.txt file is used to save and load commands.history.txt: Text file that stores the number of input arguments as well as the arguments themselves.background.c: Create, check and execute background processes. When placed in while loop, displays status of the background process.handler.c: Code for CTRL+Z and CTRL+C implementation.fgbg.c: Does 2 things: bring stopped or running process to foreground and resume it and change stopped background process to running in background.jobs.c: Display running or stopped jobs based on flags and command line input.sig.c: Does signal handling for the particular job number specified.redirect.c: Implement redirection based on flags '>', '<', '>>'.PIPINGis implemented inutility.c.auto.c: Code to implement Autocompletion.
$ make //Builds the code by itself
$ ./a.out //To start running the terminal (displays the terminal prompt after successful build.)