Linux Training for People New to Linux - How to Use Linux Command Line Components by Clyde Boom
Linux Commands - The great thing about Linux commands is that they are virtually identical from one Linux distribution (version) to another. So the way the real pros do Linux administration is to work at the Linux command line and run Linux commands. ... Linux Tips: Linux commands are run at the Linux command line prompt and this prompt is shown as ]# at the left of the command. ... The "item(s)" that the Linux command is being run "on" When you run a Linux command, spaces are used between: the Linux command name, the command options and the "item" the command is being run "on".

How To Control The Way Linux Starts Up: GUI or Command Line Interface by George Chamoun
If you were interested in learning linux, one of the main reasons was learning how to work using Linux Shell environment. That is the Command Line Interface ( CLI). How Did I know?. It happened to me, and the most asked Question is how to access the Command line in Linux. ... Here is how you do it: 1-If you are presented with the command line after Linux boots, And after you login and end up at the command line prompt, you Type: STARTX The above command start up the GUI from the command line, and Get you in the Graphic GUI environment of Linux.

Passing The Cisco CCNA Exam: An Illustrated Guide To Router Modes by Chris Bryant
When you're getting started on your CCNA studies, learning the different router modes is key to passing your Intro and ICND exams. But keeping those modes straight can be very difficult. (At least it was for me!) Let's take a look at the various router modes you'll need to know about to pass... R1(config)#line console 0 R1(config-line)#password cisco R1(config-line)#login R1(config-line)#line vty 0 4 R1(config-line)#password cisco R1(config-line)#login Notice that you do not have to exit one interface mode to go to another one.

Linux Terminal Control Sequences by Bernard Peh
Linux terminals share alot in common with their primitive ancestors such as vt100 like consoles. These early devices is capable of sending sequences that signaled events outside of the normal flow of typed characters, such as escape, tab, linefeed...etc. ... So if you tpye WC at the command prompt, the command will wait for your input till you use CTRL-D to signal the end of transmission. ... For example, if you accidentally run a command that does not stop, use CTRL-C to cancel the command. ... You can later restore back the command using the fg command.

Using Perl and Regular Expressions to Process HTML Files - Part 3 by John Dixon
In Part 1 we had a quick look at what Perl and regular expressions are, and introduced the idea of using them to process HTML files. In Part 2 we developed a Perl script to process a single HTML file. In this part we'll look at how to process multiple files. ... script1.pl 1 open (IN, "file1.htm"); 2 open (OUT, ">new_file1.htm"); 3 while ($line = [IN]) { 4 $line =~ s/[h1]/[h1 class="big"]/; 5 (print OUT $line); 6 } 7 close (IN); 8 close (OUT); script2.pl 1 foreach $file (@ARGV) { 2 rename $file, "$file.bak"; 3 open (IN, " 4 open (OUT, ">$file"); 5 while ($line = [IN]) { 6...

Power of the Unix 'for' Loop by Praveen Puri
If you are a programmer or engineer working in a unix or linux environment, you will probably find the shell 'for' loop to be a handy tool for automating command line tasks. Here are three examples of the 'for' loop. All the commands are in italics and should be entered on the command line,... If the file is readable, print the first line, otherwise print an error message: for i in `cat file_list.txt` do if test -r $i then echo "Here is the first line of file: $i" sed 1q $i else echo "file $i cannot be open for reading." fi done Here, we loop...

Cisco CCNA Certification: Passwords, Passwords, Passwords! by Chris Bryant
When you’re looking at a Cisco router configuration, figuring out what the different passwords do can be a little confusing at first. But as I tell all my students, the key to understanding something that looks complex is to break it down to smaller parts. ... To use the local database instead of a common VTY password: Line vty 0 4 Login local This allows each user to have their own password instead of everyone using the single VTY line password. ... Having said that, let’s take a look at a typical running configuration and then break it down line by line to make sure you understand...

Using Perl and Regular Expressions to Process HTML Files - Part 4 by John Dixon
In Part 1 we had a quick look at what Perl and regular expressions are, and introduced the idea of using them to process HTML files. In Part 2 we developed a Perl script to process a single HTML file. In part 3 we looked at one way of processing multiple files. ... script2.pl 1 foreach $file (@ARGV) { 2 rename $file, "$file.bak"; 3 open (IN, " 4 open (OUT, ">$file"); 5 while ($line = [IN]) { 6 $line =~ s/[h1]/[h1 class="big"]/; 7 (print OUT $line); 8 } 9 close IN; 10 close OUT; 11 } In script2.pl, it's line 1 that enables us to enter filenames at the command prompt.

Cisco CCNA Certification: The Hidden Details Of Telnet by Chris Bryant
Telnet is a simple yet powerful program that allows you to connect to a remote Cisco router or switch, and then configure it as though you were right at the console. Telnet is also one of those features that seems so very simple, until you get asked a half dozen questions about it on your CCNA... R3(config)#line vty 0 4 R3(config-line)#login % Login disabled on line 2, until 'password' is set % Login disabled on line 3, until 'password' is set % Login disabled on line 4, until 'password' is set % Login disabled on line 5, until 'password' is set % Login disabled on line 6, until...

Cisco CCNA Certification Exam Tutorial: The OSPF RID by Chris Bryant
OSPF is a major topic on your CCNA exam, as well it should be. OSPF is a widely-used WAN protocol, and you need to learn the fundamentals before moving on to more complicated configurations. One such detail is the OSPF Router ID, or RID. The RID is the dotted decimal value by which other OSPF... [no]: yes 1d05h: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on Serial0 from 2WAY to DOWN, Neighbor Down: Interface down or detached 1d05h: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0 from 2WAY to DOWN, Neighbor Down: Interface down or detached After entering the router-id command, the router...