Archit's Shell (A-Hell)

How to run

run following commands in terminal
    ->  make
    -> ./A-Hell

to remove object and text files 
    -> make clean

Features

• pwd
• echo
• cd
• ls
• pinfo
• exit/quit ( also by pressing Ctrl+d )
• foreground commands
• background commands with exit status
• redirection only
• piping only
• piping + redirection
• setenv
• unsetenv
• jobs
• kjob
• fg
• bg
• overkill

• Signal Detection

  • Ctrl+Z : stopped foreground and send it in background
  • Ctrl+C : kill any foreground process
  • Ctrl+D : exit shell (EOF)

• BONUS COMMANDS

  • history
  • nightswatch
    • interrupt
    • newborn
  • last dir by cd - : assuming that in starting of shell lastdir = executable address (till directory changes)
  • exit status along with prompt
  • chaining commands with @ as AND, and $ as OR

• EXTRA COMMANDS

  • to clear the terminal screen by system("clear")
    • syntax -> clear

Modular Explaination

• C files

  • archit.c : main + exiting shell(quit | exit | EOF(Ctrl+D)) + signals ( Ctrl+C , Ctrl+Z )
  • prompt.c : codes for printing prompt
  • cd.c : codes for cd command
  • echo.c : codes for echo command
  • pwd.c : codes for pwd command
  • ls.c : codes for ls command
  • pinfo.c : codes for pinfo command
  • cmd.c : codes for back/foreground command
  • history.c : codes for history command
  • nightwatch.c :codes for nightswatch command
  • redi.c : code for redirection commands only(SP1)
  • piponly.c : code for pipeonly commands only(SP2)
  • pipe.c : code to execute piping with redirection (SP3)
  • ppp.c : helper code for pipe.c
  • setenv.c : code for setenv command
  • unsetenv.c : code for unsetenv command
  • jobs.c : code for jobs command
  • kjob.c : code for kjob command
  • overkill.c : code for overkill command
  • fg.c : code for fg command
  • bg.c : code for bg command
  • boom.c : code for chained commands

• Header file

  • header.h
  • prompt.h
  • cd.h
  • echo.h
  • pwd.h
  • ls.h
  • pinfo.h
  • cmd.h
  • history.h
  • nightswatch.h
  • redi.h
  • piponly.h
  • pipe.h
  • ppp.h
  • setenv.h
  • unsetenv.h
  • jobs.h
  • kjob.h
  • fg.h
  • bg.h
  • overkill.h
  • boom.h

• makefile

• README.md : itself

• All other files are useless in hell

ASSUMPTIONS

• Outputs of all internal processes can redirected to a file but inputs cannot
• In piping, pipine+redirection and chaining we use don't use internal commands
• exit status is set neutral for chainned commands and exit staus SUCESS for complete execution or WARNING in a command else if any ytype of error detected it will be set as FAILURE
• WARNING status in yellow colour if cmd has extra arguments, then the ouput will be for minimal( default with no flags ) cmd
• ERROR status in red colour if cmd is facing error with corresponding error
• added colours in prompt to deffrentiate it by other
• added extra msg at starting and exit position

POSSIBLE ERRORS

• printing of prompt twice when q+enter is pressed in nightswatch (one for q+enter and other for next command ig!code)