How to schedule and run script on specified time and date – Crontab

Linux systems are capable of running scheduled jobs. Server administrative task are done on regular basis even while sysads are away or during sleeping hours. This keeps a fully working production server do unattended jobs on periodical basis. cron is a linux utility that schedules and automates jobs. This blog entry covers how to do(…)

How to Sync date and time via NTP server

Syncronizing your current date and time is as important as making database backups. Without proper accurate stamped date and time, any backup file with any stamped date on it would be meaningless. Without correct time and date, those scripts that depend on date and time schedule would be executed inaccurately and would give you result(…)

How to enable and disable of telnet service

The telnet command is used to communicate with another host using the TELNET protocol. If telnet is invoked without the host argument, it enters command mode, indicated by its prompt ( telnet>). In this mode, it accepts and executes the commands listed below. If it is invoked with arguments, it performs an open command with(…)

How to Install and Configure MRTG

The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing PNG images which provide a LIVE visual representation of this traffic. MRTG is basically used for generating graphs to a device, network host, IP-based appliances for monitoring usage, live data and statistics usage. This(…)

How to Install and Configure a Caching DNS server

BIND DNS are nameservers responsible basically for resolving domain names or hostnames into their equivalent IP addresses. Websites or domain names have their own equivalent IP addresses that are usually managed and provided by the same website firms. If somebody is browsing a website from his browser, this website is being resolved, looked up and(…)

How to use Nmap for Port Scanning in Linux

How to know which port is open from unmanaged remote host? How to determine running application and services from remote host? How to do basic port scanning against a host? How to confirm ports opened from remote host? Here are a several ways to do port scanning and know which port/services are currently opened from(…)

Nagios Monitoring – How to install and generic setup

A lot of powerful monitoring tools are freely available from linux world. One of them is Nagios. Nagios is a fairly complex linux monitoring tool that determines current status of target host or equipment. Two good things about Nagios is that Nagios supports web-enabled administration page and user view-only mode account. The other one is(…)

How To Scan DNS BIND Conf File For Errors On Fedora

What is BIND? BIND (Berkeley Internet Name Domain) is an implementation of the DNS (Domain Name System) protocols. BIND includes a DNS server (named), which resolves host names to IP addresses; a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating properly. When(…)

Blue screen troubleshooting tips – Windows

Normally, the blue screen of death contains a driver name, and some addresses; if you’re lucky, removing that driver will do the trick. But what if there is no driver name on the BSoD? And what if you don’t have all the skills to play with crashdumps and debuggers? In this case, Autoruns comes to(…)

How to Get Linux Disk Space and Usage

Here’s is a command that shows several usage and ways of retrieving disk space usage. This disk space usage command is another abused and bypassed linux command that has been repeated over and over again from samples and old linux blog entries among the blog entries around here. Here’s a quick run covering details and(…)

How to Spell Check Files via Terminal

Here’s another useful command liner utility that can check and correct spelling of a file. How to check the spelling of a HTML file from terminal? How to check the spelling of a Latex file from terminal? How to check the spelling of a nroff/troff file from terminal? How to check spelling of a file(…)

How to Determine RedHat and Fedora release version

A quick blog post on how to determine your Fedora release name and its release version. For several years of staying and working under a company with multiple linux distributions and versions, multiple OS upgrades and server redundcancy backups makes it somehow confusing and difficult to differentiate which release name and version was a specific(…)