Tagged: Sysadmin

Some Linux Iptables Examples

Some Linux Iptables Examples

Iptables is an application program that allows a system administrator to configure the tables provided by the Linux kernel firewall and the chains and rules it stores. Today we are going to review some...

Using Grep To Search For Text Patterns

Using Grep To Search For Text Patterns

I have been using Linux for a while on my server and have a large collection of the text file everywhere. I’m interested in learning about searching a text string. Can you tell me...

Working With Cron Jobs On Linux

Working With Cron Jobs On Linux

Cron Jobs are used for scheduling tasks to run on the server. They’re most commonly used for automating system maintenance or administration. However, they are also relevant to web application development. There are many...

Visualize Files Content – Cat, Tail, Head

Visualize Files Content – Cat, Tail, Head

Cat, Tail, Head Commands are so useful when you are working with files. Head Command The head command reads the first ten lines of a any given file name. head [options] [file(s)] Options -c,...

Nmap Examples For Network Admins

Nmap Examples For Network Admins

Nmap (Network Mapper) is a security scanner used to discover hosts and services on a computer network, thus creating a “map” of the network. To accomplish its goal, Nmap sends specially crafted packets to...

Server Maintenance Checklist

Server Maintenance Checklist

1. Verify your backups are working. Before making any changes to your production system, be sure that your backups are working. You may even want to run some test recoveries if you are going...