This is Unix shell built from scratch in C as part of the Operating Systems course at IIIT-Hyderabad.
1. Compile: make
2. Run: ./a.out
Here is a demo!
- Print working directory -
pwd - Change directory -
cd(cd ..,cd~,cd <filename>) echo(takes care of double quotes)- List -
ls [al](ls -a,ls -l,ls -al,ls -la) - Info file viewer -
pinfo - Set environment variables -
setenv var [value] - Unset environment variables -
unsetenv var - Display status of jobs in terminal -
jobs - Kill job -
kjob <job_num> <sig_num> - Brings background process to foreground -
fg <job_num> - Send stopped background process to Running state -
bg <job_num> - Overkill -
overkill - Quit shell -
quitorexit - Suspend current foreground process -
Ctrl Z - Interupt current foreground process -
Ctrl C - Appropriate display messages regarding the background process
- Input-Output Redirection -
>,<,>> - Piping - Redirection using pipes
- I/O redirection + Pipes redireciton
- Personal Reminder (reminds you with a custom message after given time lapse)-
remindme <time> <Remainder> - Clock Command (Displays dynamic date and time after a fixed time interval) -
clock -t <interval>
This file contains code for display of prompt, getting input, parsing and execution of functions pwd, cd, fg, bg, crtl C, crtl Z.
This file contains code for execution of List command ls with various args.
This file contains code for execution of pinfo command.
This file contains code for execution of the command echo.
This file contains code for setting and unsetting environment variables.
This file contains code for listing the status of jobs started in the current terminal.
This file contains code for the input and output redirection.
This file contains code for the execution of a new command, Clock, which I have added.
This file contains code for the execution of a new command, Reminder, which I have added.