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netstat command

How do I clear squid cache? How do I re-create the cache directories on a server where Squid version 3.x is currently running in Linux or Unix based server?
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Linux: Find Out What Is Using TCP Port 80

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?
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FreeBSD PPTP Client: Install and Create a VPN

I work form home, and I need to login into our corporate network using a pptp based vpn. How do I configure and setup up a PPTP VPN client under FreeBSD desktop / laptop or server operating systems?
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Linux Network Statistics Tools / Commands

How do I find out the current network interface throughput statistics on Linux (CentOS or Debian based distro)? How do I see current kernel snmp counters and network interface statistics on Linux operating systems?
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Debian Linux Install OpenSSH SSHD Server

How do I install OpenSSH sshd server under Debian GNU/Linux operating systems?
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I've edited /etc/ssh/sshd_config to change the port number:

Port 1255

However, I'm getting an error as follows:

sshd[26792]: error: Bind to port 1255 on failed: Permission denied

How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux?
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Linux: Check Network Connection Command

How do I check network connections under Linux using command line options?
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