egrep command HowTo - Linux / Unix Q & A from nixCraft

Debian Linux: Upgrade v6.0.x Squeeze to v7.0.0 Wheezy

last updated May 9, 2013 in Debian / Ubuntu, Package Management

Recently Debian Linux version 7.0 (“Wheezy”) released. This version shipped with many new features – improvements to multimedia support, improved security through hardening flags and the OpenStack suite and the Xen Cloud Platform to name a few. How do I upgrades from Debian Linux version 6.x.x (squeeze) to the latest version 7.0.0 wheezy using command line options? How do I upgrade my Debian 6.x server to 7.x over the ssh session?

iptables: Read a List of IP Address From File And Block

last updated October 26, 2010 in Iptables

How do I read a list of ip address (subnets) using a text file and block all of them using Linux iptables command?

Linux Create A Bootable USB Pen

last updated March 11, 2010 in CentOS, Fedora Linux, RedHat and Friends, Storage

How do I create a bootable USB pen drive to start my CentOS / Fedora Linux? How do I create a bootable USB flash pen for installation of Linux, and for creation of rescue and other special-purpose boot disks using command line options?

Linux: Parse an IP Address

last updated January 28, 2011 in Linux

How do I parse my Linux servers IP address using a Bash shell?

FreeBSD: pkg_version: corrupted record (pkgdep line without argument), ignoring

last updated May 24, 2010 in FreeBSD

I‘m using portmaster to manage my ports without external databases. However, when I run the try to run pkg_version -l ‘<', I'm getting the following error:

pkg_version: corrupted record (pkgdep line without argument), ignoring

How do I fix this problem?
Continue reading “FreeBSD: pkg_version: corrupted record (pkgdep line without argument), ignoring”

Troubleshooting: Apache Webserver Will Not Restart / Start

last updated February 5, 2009 in AIX, Apache, CentOS, Debian / Ubuntu, Fedora Linux, FreeBSD, FreeBSD Jails (VPS), Linux, Networking, OpenBSD, RedHat and Friends, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIX

My CentOS Apache 2 (httpd) webserver will not start. It was working fine, but I made few changes to httpd.conf and it is not restarting. What are some things to check in order to solve my Apache server restart issues?

Linux SATA Drive is Being Displayed as /dev/hda Instead Of /dev/sda

last updated November 18, 2008 in CentOS, Debian / Ubuntu, Fedora Linux, Hardware, Linux, RedHat and Friends, Suse, Troubleshooting, Ubuntu Linux

Q. My SATA drive is being displayed as /dev/hda instead of /dev/sda. How do I fix this problem and make sure I get /dev/sda and speed of SATA under Linux operating systems?