Linux

 INSTALL@RedHat 6.2
 INSTALL RedHat 7.1

 Basic Linux Command

 Network Card INSTALL
 ifconfig
 RPM

 Squid
 Sendmail
 Samba
 SSH

 NETWORK FIREWALL SECURITY 
 ipchains
 psad Port Scan Attack Detector www.cipherdyne.com
 nmap port scanner
 netfilter netfilter.samba.org
 nPLUSE www.insecure.org/nmap/index.html
 NetSaint www.netsaint.org
 tcpdump

 fstab
 inittab
 vi