do I need to use the Run button each time when I write a command in Jupyter environment ?
Assuming that your question is about execution of code cells in notebooks, the answer is no, you can use a keyboard shortcut such a Ctrl + Enter or Shift + Enter.
If your question is about something specific to JupyterHub (as the category you posted in suggest) I think a clarification might be useful.
Thank you so much, yes, I meant about the execution of code cells and Ctrl+Enter worked. Sorry for posting to the wrong category if I did so.
No worries, I moved it to “Notebook” category now.