Technology Tips, and Anything Else
If you open a command prompt in Windows, and do a ping test, you’ll notice that it will only perform four pings and then stop. This is OK if you want to do a quick test, but, what if you want to perform a continuous ping that keeps pinging? Well, we have the -t option! …
Continue reading “Running a Continuous Ping that doesn’t stop (on Windows)”
Quick PowerShell Tip! To list all of the IP addresses on your local system, along with the associated interface name: Get-NetIPAddress | ft IPAddress, InterfaceAlias This will include all IPv4 and IPv6 addresses.
Often you will grep for certain strings in a text file, but need to find which line it’s on within that file. On a standard grep output, you will see the output, but have no idea which line the string has been found on. grep has an option, -n, which resolves that. As an example, …
cat can be used to print the contents of a file in a Terminal, and it’s often useful to number each line of the output (including empty lines). Adding line numbers is as simple as adding the -n switch to the command: cat -n filename.txt Example Output, with -n switch: $ cat -n filename.txt 1 Line …
On Windows based PCs and Servers, and where IPv6 is enabled on one of the network adapters, you may find that when you do a: ping name-of-host … you get an IPv6 address returned in the results. But what if you want to test IPv4 connectivity? You can add a -4 switch to the ping …
Continue reading ““Ping Hostname” Returning an IPv6 Address Instead of IPv4? (Windows)”
grep is a great way to find phrases, words, and characters in text. One of the biggest stumbling blocks is case – is the word “Hello”, “hello”, “HELLO”, or even “HeLLo”? All of these are different, and a “grep “Hello”” would only find lines containing the first “Hello” example. You can, however, exclude case from …
Continue reading “Using grep and Ignoring Case (Case Insensitive grep)”
A quick reference Subnet and CIDR guide. What’s a /28? How many IPs do I get to use with a /26? Well, see the table below! Usable IPs is the Total IPs minus the Network and Broadcast IPs. CIDR Subnet Mask Total IPs Usable IPs /32 255.255.255.255 1 1 /31 255.255.255.254 2 0 /30 …
Continue reading “CIDR, Subnet Masks, and Usable IP Addresses Quick Reference Guide (Cheat Sheet)”
There may be occasions when you wish to query a DNS server directly. I often do it before changing DNS servers for a domain; I’ll setup the new records on the new DNS servers, and then query them directly to ensure they are returning the correct records. I recommend that anyone running DNS services for …
Continue reading “Using dig to Query a Specific DNS Server (Name Server) Directly (Linux, BSD, OSX)”
Here in the UK, mobile operators include different amounts of data with the iPhone data tarrifs – some even offer unlimited (with fair use making them not unlimited at all). Check the terms very closely, to know exactly how much data is included with your tariff on a monthly basis. I bought an iPhone 3GS …
Continue reading “iPhone Data Usage: My Average Monthly Data Usage”
Finding out when you last rebooted your Windows 7 machine can be completed using the “systeminfo” command. Open a Command Prompt by going to Start and opening “cmd”. You will then be presented with a command prompt window, where you need to type the systeminfo command below: C:\> systeminfo | find “System Boot Time” System …
Continue reading “When Did You Last Reboot Your Microsoft Windows 7 Machine? (Check Uptime)”