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Linux / Unix: sed Command Print Only Matching Lines

I see many examples and man pages on how to do operations like search-and-replace using sed. But, I want to match a given string or a regular pattern expression and display on the screen. How do I print lines with matching pattern using sed command only under Unix like operating systems?
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Linux / Unix: Find Out DNS Server IP Address / Names

How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
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HowTo: Install firefox-15.0.tar.bz2 in Linux

Idownloaded Firefox version 15.0 from mozilla ftp server. The name of file is firefox-15.0.tar.bz2. How do I install Firefox under any Debian / Ubuntu / Fedora or any Linux distribution?
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Bash History: Correct / Repeat The Last Command With a Substitution

I often type the wrong command as follows under Linux bash shell:
rsync -av dir1 user@server1.cyberciti.biz:/path/to/dir1
cp -av file1*.txt file2*.txt /path/to/dest

I need to correct those command as follows:

rsync -av dir5 user@server1.cyberciti.biz:/path/to/dir1
cp -av delta1*.txt delta2*.txt /path/to/dest

How do I replace dir1 with dir5 or file with delta and repeat the last command under bash shell?
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HowTo: grep Text Between Two Words in Unix / Linux

I got over 100s of HTML files in the following format:

 <title>Statistics for ABC LTD - January 2007 - Rang IDXYZZAZZZZ</title>
<body BGCOLOR="#E8E8E8" TEXT="#000000" LINK="#0000FF" VLINK="#FF0000">
<h2>Statistics for ABC LTF</h2>
Summary Period: January 2007<br />
Generated 01-Feb-2007 06:40 CET<br />
<hr />
<font SIZE="-1"></font></p></center><pre>
my data 1
my data 2
my data 3
my data 10000
my data N times

Generated by MyAppDbStatsWriter (UNIX) version 1.9b2

How do I extract text between two words (<PRE> and </PRE>) in unix or linux using grep command?
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TCSH / CSH: set vs setenv Command Differences

I've recently started to use FreeBSD operating system with tcsh (c shell clone) shell. I noticed that both set and setenv command set shell user environment. What's the difference between the SET and SETENV commands?
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Install and Use nmon Tool To Monitor Linux Systems Performance

How do I install nmon command under Linux operating systems to find out performance information for my CPU, memory, network, disk, virtual memory, top process and other part of my HP server running on Debian Linux or CentOS Linux 6.x amd64 bit server?
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Linux / Unix: lftp Command Mirror Files and Directories

How do I mirror files from remote ftp server using lftp command? How do put the entier directory from a local disk to a remote ftp server (reverse mirror) using lftp command under Linux and Unix like operating systems?
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Linux sys-unconfig: Reconfigure the System Upon Next Boot

I can use unconfigure command on a previously configured Solaris Unix box and leave it in an unconfigured state. How do I unconfigure CentOS Linux OR RHEL 6.x on HP server. How do I reconfigure the system upon next boot?
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HowTo: Install firefox-14.0.1.tar.bz2 in Linux

I've downloaded Firefox version 14.0.1 from mozilla ftp server. The name of file is firefox-14.0.1.tar.bz2. How do I install firefox in any Linux distribution?
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