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Port Scan the Entire Internet in 5 Minutes?

January 19, 2017 mike Sysadmin

One of my favorite sub-reddits is /r/coolgithubprojects. I check it out a few times a week looking for interesting open source projects. One interesting project

sort linux

Figuring Out Linux sort By Examples

December 14, 2016 mike Sysadmin

The Linux sort – it’s incredibly fast, runs well on files larger than ram, and a must to master for any good sysadmin. Here are

How to Watch For a Process to End on Ubuntu Linux

December 9, 2016 mike Sysadmin

I wanted to send myself a text when a long running process was done so I needed a command that would watch for a process

nested zip extract

How to Recursively Extract All Nested Zip Files in Linux

December 2, 2016 mike Sysadmin

I needed to recursively unzip a big mess of nested zip files. This shell command does the trick, it also preserves the directory structure.

how-to-setup-password-less-loggin-with-ssh-keys

How to Setup Password-less Loggin with SSH Keys

November 28, 2016 mike Sysadmin

Having to type in passwords manually all day long into servers you manage is a pain. You should be using ssh keys, they’re more secure,

This is the Best Command to Upgrade Ubuntu

November 25, 2016 mike Sysadmin

This is the only command I’ll use to upgrade or update the OS on my Ubuntu instances, any version. This doesn’t upgrade to the next

ssh into ubuntu

Securing your Ubuntu SSH Server the Right Way

November 14, 2016 mike Sysadmin

If you’ve ever managed an ssh server that’s open on the internet server you might have noticed a bunch of IPs scanning and trying to

Copy a File to Server Over SSH and Pick Up Where it Left Off

November 14, 2016 mike Sysadmin

Sometimes you want to copy a single large file and have them restart where it left off if the transfer fails. Instead of using scp,

mtr-command

Instead of Traceroute use this: mtr

November 14, 2016 mike Sysadmin

mrt is a very useful Linux command line utility for diagnosing networking problems. It’s basically of a combination of ping and traceroute in one.  It’s best

dsh manpage

Running the Same Command Over SSH to Multiple Servers in Parallel

November 10, 2016 mike Sysadmin

If you manage multiple servers, or even just a few, this command might come in handy. It’s called dsh – distributed shell.  It acts very similar

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