apt-get中的-qq参数说明

-q, --quiet

Quiet. Produces output suitable for logging, omitting progress indicators. More q's will produce more quiet up to a maximum of two.

You can also use -q=# to set the quiet level, overriding the configuration file.

Note that quiet level 2 implies -y, you should never use -qq without a no-action modifier such as -d, --print-uris or -s as APT may decided to do something you did not expect.