Til

EBS sends events to CloudWatch when creating, deleting or attaching a volume, but not on detachment. However, CloudTrail is able to list detachments, the command below lists the last 25 detachments. aws cloudtrail lookup-events \ --max-results 25 \ --lookup-attributes AttributeKey=EventName,AttributeValue=DetachVolume Setting up noticiations is then possible with CloudWatch alarms for CloudTrail. The steps are summarized below: Ensure that a trail is created with a log group. Create a metric filter with the Filter pattern { $.eventName = "DetachVolume" } in CloudWatch. Create an alarm in CloudWatch with threshold 1 and the appropriate Action.

Introduction These are tar commands that I use often but need help remembering. Contents Introduction Create an archive Create a gzip compressed archive Extract an archive Extract a gzip compressed tar archive List files in an archive List files in a compressed archive Extract a specific file from an archive Create an archive tar -cvf send.tar send/ -c Create an archive -v Verbose -f Specify filename Create a gzip compressed archive tar -czvf send.tar.gz send/ -c Create an archive -z Compress archive with gzip -v Verbose -f Specify filename Extract an archive tar -xvf send.tar -x Extract an archive -v Verbose -f Specify filename Extract a gzip compressed tar archive tar -xvzf send.tar -x Extract an archive -v Verbose -z Decompress using gzip -f Specify filename List files in an archive tar -tvf send.tar -t List contents -v Verbose -f Specify filename List files in a compressed archive tar -tzvf send.tar.gz -t List contents -z Decompress using gzip -v Verbose -f Specify filename Extract a specific file from an archive tar -xvf send.tar my_taxes.xlsx scan.pdf -x Extract an archive -v Verbose -f Specify filename :)

Squash commits already pushed to GitHub Here I squash the last N commits by rebasing and force pushing to GitHub or another remote while avoiding this helpful but unwanted error. To https://github.com/LameLemon/pepe-is-the-man.git ! [rejected] master -> master (non-fast-forward) error: failed to push some refs to 'https://github.com/LameLemon/pepe-is-the-man.git' hint: Updates were rejected because the tip of your current branch is behind hint: its remote counterpart. Integrate the remote changes (e.g. hint: 'git pull ...') before pushing again. hint: See the 'Note about fast-forwards' in 'git push --help' for details. First, through interactive rebasing set the HEAD back to the number of commits you want to squash. If you wish to include the root commit replace HEAD~3 with --root. Read more...

ffmpeg -y -i combined.mkv -vf fps=24,scale=1080:-1:flags=lanczos,palettegen palette.png ffmpeg -i combined.mkv -i palette.png -filter_complex "fps=24,scale=1080:-1:flags=lanczos[x];[x][1:v]paletteuse" out.gif -y Overwrite output wihtout asking -i Specify input filename -vf Video filtergraph -filter_complex Creates a complex filtergraph with inputs and/or outputs Explanation and other resources: How to make GIFS with FFMPEG (GIPHY Engineering) High quality GIF with FFmpeg “You can’t just code a gif”

Only applies if video has an existing audio track. ffmpeg -i video.mkv -i audio.mp3 -c:v copy -c:a aac -strict experimental -map 0:v:0 -map 1:a:0 ouput.mkv -i Specify input filename -c:v Encode all video streams -c:a Encode all audio streams -strict Specify how strictly to follow the standards -map Designate one or more input streams as the srouce for the output file

ffmpeg -i input.mkv -vf reverse -af areverse output.mkv -i Specify input filename -vf Video filtergraph -t Audio filtergraph

ffmpeg -i input.mkv -ss 00:00:03 -t 00:00:08 -async 1 output.mkv -i Specify input filename -ss Seek start position -t Duration after start position -async 1 Start of audio stream is synchronised Resources ffmpeg Documentation - Official FFmpeg documentation ffmprovisor - A repository of useful FFmpeg commands for archivists

Introduction These are a few git commands that I refer to from time to time when I need a reminder. This is by no means a comprehensive guide on how to use git. Contents Introduction Add co-authors to a commit Branching with Git Checkout a remote branch Create a branch from another branch Change the last commit Set the author Set the date Fetch a pull request Squash commits already pushed to GitHub Keep a fork up to date Further reading Add co-authors to a commit This will allow you to give credit to more than one author for a commit. This works on GitHub only, and count towards the contribution history of all authors. Read more...

Introduction This is intended for users who already have a basic understanding of PRAW and want to switch from hard coding the username and password into their code to using a refresh token. This was written using PRAW version 6.1.1 and Python 3.7.1. To let you in on a secret, I initially wrote for myself so I don’t forget how I did it. Read more...