Pesky's Blog

Grabbing just an IP address from a network interface can be useful for scripting. In the example below the assumed interface is eth0. ip a show eth0 | grep "inet " | cut -d' ' -f6 | cut -d/ -f1 You can then save this into a variable and use it in other commands. local_ip=$(ip a show eth0 | grep "inet " | cut -d' ' -f6 | cut -d/ -f1) python3 -m http. Read more...

ffmpeg -i input.mkv -ss 00:00:03 -t 00:00:08 -async 1 output.mkv Arugment Description -i Specify input filename -ss Seek start position -t Duration after start position -async 1 Start of audio stream is synchronised See these StackOverflow answers for a debate on various other methods of trimming a video with ffmpeg.

Updating images for containers that are run through docker-compose is simple. Include the appropriate tags for the image value. docker-compose pull docker-compose up -d You can then delete the old, now untagged image. The following command deletes all untagged images. docker image prune Rollback to a previous image If you wish to rollback to the previous image, first tag the old image. docker tag <IMAGE ID> <REPOSITORY>:<TAG> Replace the image value in the compose file with the new <TAG> and recreate the service. Read more...

Install the NFS client pacakge. For distros that use yum install nfs-utils. sudo apt install nfs-common Manually mount the share in a directory. Replace the following with your own values: server with your NFS server /data with your exported directory /mnt/data with your mount point sudo mount -t nfs server:/data /mnt/data To automatically mount the NFS share edit /etc/fstab with the following: # <file system> <mount point> <type> <options> <dump> <pass> server:/data /mnt/data nfs defaults 0 0 To reload fstab verbosely use the following command: Read more...

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 { $. Read more...

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 . 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