apt-get update only for a specific repository
apt-get update -o Dir::Etc::sourcelist="/etc/apt/sources.list.d/xyz_repo.list" -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"

seen from United States
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seen from United States
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seen from United States
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seen from United States

seen from United States
seen from Germany

seen from Malaysia

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seen from China

seen from United States
seen from United States
apt-get update only for a specific repository
apt-get update -o Dir::Etc::sourcelist="/etc/apt/sources.list.d/xyz_repo.list" -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"

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OpenSSH listening on multiple ports
If you want to have OpenSSH to listen on one or more ports just add the port directive to /etc/ssh/sshd_config as follows
port 22
port 1234
Then just reload ssh
root@localhost:~# /etc/init.d/ssh reload