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Linux Shell in C

This Linux Shell in C can be run by compiling with make and then running with ./ainux. 'history' has been implemented on top of the basic requirements.

How to Run the Shell

  1. Compile the project using the Makefile: 
    make
  2. Run the shell executable: 
    ./ainux

Files

makefile

  • Used to compile all the files present.

main.c

  • Main file where we call all our functions to execute commands.
  • Tokenizes inputs and separates commands by semicolons.

prompt.c

  • Prints the prompt of the shell and changes the prompt accordingly if we change the present directory.

cd.c

  • Allows us to change the directory that we are present in.
  • Takes both absolute and relative paths.

pwd.c

  • Displays the directory we are present in.
  • Displays relative paths if the directory is inside the shell directory and absolute paths otherwise.

echo.c

  • Prints the argument given.

ls.c

  • Allows us to display the files present in the current directory.
  • Accepts relative and absolute paths.
  • Accepts flags to print hidden files and file permissions.
  • Works for multiple directories in any order of arguments.

fore.c

  • Allows us to implement foreground processes.

back.c

  • Allows us to implement background processes and prints whenever the background process finishes executing.

pinfo.c

  • Prints process-related info.
  • Prints info of the currently running process if no PID is given or gives the info of any specified PID.
  • Accepts at most 1 PID and gives an error otherwise.

history.c

  • Keeps commands entered into the shell in hist.txt.

historyprint.c

  • Prints the history of commands run in the shell.
  • The user can specify the number of commands to show up to 20.
  • Just running history without specifying the number of commands prints the last 10 commands entered.
  • Specifying a number higher than 20 just prints 20 commands.

hist.txt

  • Stores history of commands up to 20 commands.

bg.c

  • Changes the state of a stopped background job with a given job number to running.

fg.c

  • Brings a job with a given job number to the foreground and changes its state to running if it isn't already.

env.c

  • Implements setenv and unsetenv commands.

jobs.c

  • Prints all running background processes with associated information pertaining to each.

kjob.c

  • Sends a given signal to the job of a given job number.

overkill.c

  • Kills all the background processes.

redirection.c

  • Implements input/output redirection.

sig.c

  • Implements signal handling.

Error Handling

Corresponding error messages will be displayed in case invalid arguments or an incorrect number of arguments are provided upon the execution of a certain command, depending on their functionality in the terminal.

Enjoy using the shell!