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https://linux.die.net/man/8/useradd

...

useradd xxxx




passwd xxxx




sudo permission

usermod -aG wheel xxxxxx
Allow user to SSH

sshd_config


superuser accountCentos

visudo

search for:   in vi:  /ALL=(ALL)

copy the "root" line with the new account name

xxxxx   ALL=(ALL)   ALL

...

loging logs 

lastlog

last

grep sshd /var/log/audit/audit.log
failed logs

more /var/log/secure

cat /var/log/secure | grep 'sshd'