A shell built in c using threads, pipes, signals, and process groups.

• Supports ; seperated commands.
• Supports upto 3000 arguments to any command.
• Supports some shell variables like ~ and -
• Supports some builtin commands -> cd pwd echo.
• Piping - Supports piping of multiple commands
• FileRedirection - Supports file redirection. (with piping as well).
• jobs - Shows all the background jobs that are running or in STOPPED state.
• kjob JOBNO SIGNAL - send a job a particular signal, essentially jobs must be present in the list given by the 'jobs' command.
• fg JOBNO - Sends a process from background to foreground, again th process must be listed in 'jobs'.
• overkill - Kills all the jobs that are in STOPPED state or in RUNNING state.
• read A B C D - Supports reading of commands from user, ex. 'read A B C' reads 3 strings and assigns them to variables, which can then be used afterwards.
• echo - Supports spaces in command, ex. echo A B C, prints A B C while, echo $A $B $C prints the values of variables from memory.
• foreground & background - Supports instances of processes, assigning child processes as group members.
• Tracking the background processes and notifying the user when it exits.
• history = Gives all the last commands than were run in the order of execution.
• ** Handles some signals such as SIGINT, SIGKILL, and does the appropriate job when killed.
• kill PID - Kills the process with pid = PID
• exit - Exits the shell peacefully and cleanly. :)

gcc main.c -o GruShell_new or ./GruShell