bash like shell implementation
- echo string
- add 1 2 - adds the 2 numbers
- sub 2 3 - subsracts the 2 numbers
- mul 1 4 - multiplies the 2 numbers
- div 4 5 - divides the 2 numbers
- touch fileName - creates a file
- cat fileName - reads a file
- cd directory - change directory
- cd .. - change directory
- rm fileName - removes a file
- copy fileName - copies a file
- pwd - prints present working directory
- ls - lists all files in curerent working directory
- date - prints todays data
- cal - prints the calandar for the month
- mkdir - creates a directory
- rmdir - removes a directory
- df - shows the memory usage
- ps - shows the current processes running
- kill pid - kills the process with the pid