shell

type <command> --> display alias, code function or complete command path

functions [functionName] --> display all shell functions or one specific function with code

lsof -i :<port> --> show which process is listening on

$ f="file.tar.gz"
$ echo ${f##*.}
gz
$ echo ${f#*.}
tar.gz
$ echo ${f%*.}
file

https://tldp.org/LDP/abs/html/string-manipulation.html

aliases & functions

wav2flac() { ffmpeg -i "$1" -af aformat=s32:44100 "${1:r}.flac" }

flac2mp3() { ffmpeg -i "$1" -ab 320k -map_metadata 0 -id3v2_version 3 "${1:r}.mp3" }

ffmpeg -i bigvideo.mp4 -vcodec libx264 -crf 24 smallvideo.mp4

ffmpeg -i bigvideo.mp4 -vcodec libx265 -crf 28 smallvideo.mp4

ffmpeg -i input.mp4 -c:v libx265 -preset fast -crf 28 -tag:v hvc1 -c:a eac3 -b:a 224k output.mp4

docker

docker-compose exec <container> bash

docker run -it --entrypoint /bin/bash <image>

docker system prune --all --volumes

docker system df

docker builder prune docker volume prune docker volume ls

docker container ls -a

docker container rm [id]

docker container ls -aq --> list IDs only

docker container rm $(docker container ls –aq) --> remove all stopped containers

docker image ls

docker image rm [id]

git

git stash pop == git stash apply && git stash drop

git checkout 'master@{1979-02-26 18:30:00}' --> checkout at a given date

git push -u origin feature_branch_name --> push to origin

git branch -r | awk '{print $1}'| egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -d --> delete local branches that do not exist on remote

git branch -vv | grep ': gone]' | awk '{print $1}' | xargs git branch -d --> same

php

$e = new \Exception; var_dump($e->getTraceAsString());die();

vscode

• extension zoombar -> configuration -> configuration target -> workspace
• Ctrl + Shift + L --> select all occurences of highlighted text
• Ctrl + D --> add next occurrence to the selection