I recently needed to review all SSH login attempts on a server running Ubuntu Server and used this one-liner to accomplish it. Piping grep into less just lets you stay on the keyboard instead of scrolling with the mouse.

grep sshd /var/log/auth.log | less

Daryl is a super simple Jekyll theme that recently hit its 1.0.0 release.

It’s purpose is to be highly-readable, performant, and simple. A 404 page is included, feed.xml is used for RSS, and it includes an Archive/Post-list page template.

Daryl is open source and all code is available on GitHub.

tail displays a log and updates it in realtime. This command tail’s the log over SSH so that you can keep a log displayed in one window while doing more terminal work in another tab/window.

ssh -t username@10.0.0.1 "tail -f /var/log/system.log"

youtube-dl (available for UNIX/Windows) is probably my most-often used Python script. Copy/paste a YouTube URL (or any other supported website URL) and youtube-dl downloads the video locally. Incredibly handy especially when you hate buffering and would rather download something to watch it later (including whole playlists!).

After you install it, you can specify your settings in its .conf file at ~/.config/youtube-dl/config. My settings are below:

-f bestvideo[ext=mp4]+bestaudio --no-playlist

The “bestvideo” flag downloads the source video at its best format (1080p usually or 4k if available) as well as downloading the “bestaudio” source available as well. The “–no-playlist” option downloads only the video if the video is in the middle of a playlist but will download an entire playlist if you give it the playlist’s root URL. You can completely customize your settings as well like lowering the video resolution so that videos don’t take as long to download.

Here’s the syntax to use when downloading:

youtube-dl "https://www.youtube.com/watch?v=NMbM-ERy2Lk"

This command scans to see if port 22 is open within a network range and saves the output to nmapscan.txt.

nmap -p 22 -oN nmapscan.txt 172.29.16.0/22