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 China
seen from France
seen from China

seen from Malaysia
seen from France
seen from Argentina
seen from United States
seen from United States
seen from Malaysia
seen from T1

seen from United Kingdom

seen from Malaysia
seen from United States

seen from Malaysia

seen from Malaysia

seen from Malaysia
seen from United States

seen from Australia
seen from Australia
seen from China
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"
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