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Debian/Ubuntu:

sudo apt update
sudo apt upgrade

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CentOS:

sudo yum update

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sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
sudo iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A INPUT -j DROP

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sudo service --status-all

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sudo service <service-name> stop
sudo systemctl disable <service-name>

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# Ciphers aes128-ctr,aes192-ctr,aes256-ctr
# MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com

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# ½¨ÉèÊý¾Ý±¸·Ý
sudo tar -cvzf backup.tar.gz /path/to/important/data

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sudo tar -xvzf backup.tar.gz -C /path/to/restore/data

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gpg --cipher-algo AES256 -c filename

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openssl enc -aes-256-cbc -salt -in file.txt -out file.txt.enc

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