Users and Buddies

Firewalls can be physical hardware devices, or simply software. 防火墙可以是物理硬件设备，也可以是简单的软件。   Firewalls filter traffic based on rules. 防火墙根据规则过滤流量。   Filtering as far as firewalls are concerned means that

This assignment continues to practice using the bash shell and basics of combining commands using redirection and pipes.  Electronically turn in three files: homework4.txt, .plan, and .bash_profile as