• ls [-a, -l, -al, -la] - To list files in a directory.
• cd - Change directory.
• pwd - Present working directory.
• echo - Print message in shell.
• pinfo <pid> - Prints information about a given process.
• setenv <var> - To set enviroment variables.
• unsetenv <var> - To delete enviroment variables.
• jobs - Displays status of all jobs running(both foreground and background).
• fg <job_no> - To bring a background process to foreground.
• bg <job_no> - To take a foreground process to background.
• kjob <job_no> <signal> - To send a signal to a particular job.
• overkill - To kill all background processes.
• quit - To exit the shell

• Foreground and Background process using &.
• I/O redirection using > and <.
• Commmand piping using |.
• Ctrl+z puts current running process in background.
• Ctrl+c closes the current running process in shell.

To run the shell :-

• cd into the folder
• Type make
• Then type ./shell