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. ... This is a good command to use if you decide to go for a coffee break and do not want any...

How To Automate Tasks In Your Linux Server by Bernard Peh
If your host is running under the Linux (Unix) operating system, you can perform tasks in the server on a regular basis. For example, sending mails at a certain time of the day, backing up database at 6 in the morning and so on. "Cron" is a program that runs in the background of the Linux server. ... The first 5 fields are used to specify when to run the command, and the last field determines what command to run. ... For example, if I want to run a php script at 12 midnight everyday, I will type "crontab -e", then write my script as follows: 0 0 * * * php...

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... You enter the clear ip ospf process command to do this. ... [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...

Windows Not Valid After Reinstall by Matt Christensen
Recently I had an explorer.exe problem I could not fix. It resulted in me having to wipe the hard drive and reinstall Windows Xp with my legal cd that came with the computer. The installation went great, no hithes. Obviously the first thing you should do after a fresh install is get all of the... At the command prompt, type the following commands, and then press ENTER after each command. ... Click Start, click Run, type cmd, and then click OK. ... Click Start, click Run, type %systemroot%system32 and then click OK.

Windows Vista Top 10 Tips and Tricks by Zoran Petrovic
1. Power button default action The default action for the Power button on the start menu in Windows Vista is Sleep, which isn’t necessarily useful for everybody. You can configure this setting easily by using the advanced power settings panel, which is a little tricky to get to normally, but... You can do that by right clicking the Command Prompt in the list and choose "Run as Administrator" Once you have an administrator command prompt open, you can run the utility by using the following syntax: SFC [/SCANNOW] [/VERIFYONLY] [/SCANFILE=] [/VERIFYFILE=] [/OFFWINDIR= /OFFBOOTDIR=] The...

Booting Problem in PC by ravi chamria
One fine day you start your PC and get messages that say,”Book Disk failure”. The problem is that the hard disk is detected but the OS does not load. The system may get stuck in the second screen during the booting process or the OS might display an error message and refuse to load. ... Go to the command prompt and give the command fdisfk/mbr’and then give the command ‘sys C’. ... If Lila gets corrupted, you can not boot into either OS.When this happens, you have to boot into the system using some other media, such as a boot floppy or the Windows Dafter booting go to 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... Use the command privilege level 15 on the VTY lines to do so. ... Cisco routers can run quite a few passwords. ... Open Password required, but none set [Connection to 3.3.3.3 closed by foreign host] To allow telnet access into a Cisco router, configure the VTY lines with a password and the...

Cisco CCNA Exam Tutorial: Password Recovery Procedures by Chris Bryant
It might happen on your CCNA exam, it might happen on your production network - but sooner or later, you're going to have to perform password recovery on a Cisco router or switch. This involves manipulating the router's configuration register, and that is enough to make some CCNA candidates and... Save this change with write memory or copy run start, and then run reload one more time to restart the router. ... From the rom monitor prompt, change the default configuration register of 0x2102 to 0x2142 with the o/r 0x2142 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. ... The filename file1.htm, which will be entered at the command line prompt, is a value that will be temporarily stored in that variable when the script is run. ... Well, it processes one or more files entered at the command line prompt (for example, the MS-DOS prompt) and then, for each file entered, the script initially makes a...

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. ... Run the service password-encryption command to encrypt all passwords in your configuration. ... Cisco requires a password be set for Telnet access, and this basic configuration will prompt any user for the one single password. ... (This is because the router’s going to prompt you for a different password for one if you try to set...