download a file.

# Download file
curl "<url>" -OL


# Download file & rename
curl "url" -o "<new_name>" -L

flag	description
-o <file_name>	write output with name <file_name>
-O	write output as the same name
-L	follow redirect allowed

extract .tar.gz archive

tar -xzvf <your archive .tar.gz / .tgz>
tar -xzvf <your archive .tar.gz / .tgz> -C <output directory>