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Show recently installed packages 
grep "install " /var/log/dpkg.log
 
Show recently upgraded packages 
grep "upgrade " /var/log/dpkg.log 

Show recently removed packages 
grep "remove " /var/log/dpkg.log 
 
To view info from old log files use zgrep instead grep
zgrep "upgrade " /var/log/dpkg.log.2.gz 
 
 

Controle de acesso SSH com hosts.deny e hosts.allow

  Faça login na sua máquina Linux e abra uma janela de terminal. Primeiro, vamos negar todo o acesso ao daemon SSH. Abra o arquivo hosts.den...

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