Shell in C:

Execution

Run the following commands on terminal:

    make
    ./my_shell

Features

• Modular Code.
• Self implemented cd,ls,pwd,echo.
• ls with only [al] flags.
• Colored output in ls.
• Semicolon separated commands.
• Foreground Background Implemented.
• Piping and redirection
• Signal handling(SIGINT,SIGTSTP).
• Pinfo implemented for process information.
• Bonus: Remindme and clock implemented.
• exit for quitting the shell.

Other Builtin Commands

Jobs:

• Displays all the running process of the shell

Kjob:

• Usage: kjob [jobnumber] [signalNumber]
• Takes the job id of a running job and sends a signal value to that process

setenv:

• Usage: setenv var [value]
• Set the value of var to value

unsetenv:

• Usage: unsetenv var
• Destroy the environment variable var

fg:

• Usage: fg [jobnumber]
• brings a running or a stopped background job with given job number to foreground

bg:

• Usage: bg [jobnumber]
• changes a stopped background job to a running background job

overkill:

• kill all the background processes at once

Bonus Usage

Remindme:

Usage: remindme [time] [message]

Clock:

Usage: clock -t -[number of times to diplay date/time] [number: update based on fixed interval of time]

:~> clock -t -3 1
    2018-09-04 11:41:10
    2018-09-04 11:41:11
    2018-09-04 11:41:12