BASH – How to count the number of IP addresses in a log file
Background Sometimes it’s useful to see how many times a specific IP address appears in a log file. In this article we explore one method
Operating Systems
An example of Grub settings – and when to run update-grub
Background Grub controls the boot process menu, and has a number of interesting settings. Here is an example of grub settings: Example ~$ cat /etc/default/grub
How update the hosts file on a Mac
Background If you need to view a website but the IP is not already pointing to it, then you can update your hosts file. Doing
How to add a route in Linux
To add a route in Linux, do this: sudo route add -host 192.168.90.2/32 gw 192.168.1.7 The /32 means a single host, if you want to
How to set a time server for CentOS Linux
Background This article explains how to set a time server on a CentOS Linux server. Install and enable the NTP service: yum install ntp systemctl
How to change the password of a Linux user
Summary To change the password of a Linux user, do this: passwd That will change the currently logged in user’s password. To change the password
netstat command not found on CentOS
Background If you run into a situation where you want to use netstat on CentOS or Redhat but you encouter: -bash: netstat: command not found
List of Useful Netstat Commands
Background netstat is one of the most important network troubleshooting tools but the syntax can be overwhelming and even non-intuitive. Combine complex syntax with subtle
Date and Time Functions in Bash
Background Bash is very powerful for handling dates and times, but you need to get to grips with it’s syntax. This article contains a few
How to mount an USB drive on a Linux server
Background This article give a broad overview of how to add a USB drive to your Linux server. A command sequence is displayed with an