TELNET (TELecommunication NETwork) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in late 60s with RFC 15. Telnet is pretty old for login into remote system and it has serious security problem. Most admins will recommend using Open SSH (secure shell) for all remote activities. But you may find users who are still demanding telnet over ssh as they are comfortable with Telnet. Some users got scripts written in 90s and they don’t want to change it. So what do you do when users demands telnet?


Explains how to reset Urchin to prompt for a new serial key under Linux / UNIX / BSD operating systems.


A shell variable may be assigned to by a statement using following syntax: var=value If value is not given, the variable is assigned the null string. In shell program it is quite useful to provide default value for variables. For example consider script: #!/bin/bash RSRC=$1 LOCAL=$2 rsync -avz -e ‘ssh ‘ user@myserver:$RSRC $LOCAL This […]


Virtual Network Computing (VNC) is a desktop sharing system which uses the RFB (Remote FrameBuffer) protocol to remotely control another computer. It transmits the keyboard presses and mouse clicks from one computer to another relaying the screen updates back in the other direction, over a network.