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Bash Command Exercise $3$

Please explain what the following command does. What permissions are given to owner, group, and others?

chmod $751$ hello.py

What are the parameters of the following command:

chgrp usergroup$1$ hello.txt

Please write a command that uses echo and redirection to create a file, with the name "hello world.txt$".$ Note that there is a space between "hello" and "world" in the filename. The file's content should be: "hello world".

Please $(1)$ explain the differences between $>$ and $>>,(2)$ provide two command examples that show the difference between $>$ and $>>,$ and $(3)$ describe the outputs of the commands.

$(1)$

$(2)$

$(3)$