For example, we need install "unzip" command on a Ubuntu machine without Internet.
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On a online computer, google: unzip site:packages.debian.org, download unzip_6.0-8_i386.deb;
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scp unzip_6.0-8_i386 user@remoteServer:/home/user; -
on remoteServer:
dpkg -i unzip_6.0-8_i386;
bingo.