How to clear the console like cls on Windows

1. Open /usr/local/bin/cls:

    $ ee /usr/local/bin/cls
   

2. Paste:

    #!/bin/sh
    clear
    printf '\033[3J'
   

3. Give permission:

    $ chmod u+x /usr/local/bin/cls
   

Note: this is especially done for PuTTy.