Write code like it's synchrone
let get = async (URL) => {
const retval = await fetch(URL)
if (retval.ok) {
this.playlists = await retval.json()
} else {
console.error("doh! network error")
}
}
get()
Or use promise chaining
fetch(URL)
.then(stream => stream.json())
.then(data => this.playlists = data)
.catch(error => console.error(error))
auto-reply y
on installations or fsck
repairs
yes | pacman -S <something>
convert all svg files from current path into pngs
find . -name *.svg -exec mogrify -format png {} +
extract audio-only from video file with ID3 tags
ffmpeg -i <input video> -metadata title="Title" -metadata artist="Artist" -ab 256k file.mp3
record screen
ffmpeg -f x11grab -s 1366x768 -i :0.0 -r 25 -threads 2 -c:v libx264 -crf 0 -preset ultrafast output.mkv
<style type="text/css">
table { page-break-inside:auto }
tr { page-break-inside:avoid; page-break-after:auto }
thead { display:table-header-group }
tfoot { display:table-footer-group }
</style>
drop all but accept from one ip
iptables -A INPUT -p tcp --dport 8000 -s 1.2.3.4 -j ACCEPT
iptables -A INPUT -p tcp --dport 8000 -j DROP
drop all incomming ssh connections
iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j DROP
Delete all containers
docker rm $(docker ps -a -q)
Delete all images
docker rmi $(docker images -q)
Delete all dangling images
docker rmi $(docker images -f dangling=true -q)
Create docker network
docker network create mynet
clean up
docker system prune
docker volume rm $(docker volume ls -q --filter dangling=true)
run two docker img
container with different names foo
and bar
and the can reach each other with domain name foo
and bar
docker run --name foo --net mynet img
docker run --name bar --net mynet img
Set git to use the credential memory cache
git config --global credential.helper cache
Set the cache to timeout after 1 hour (setting is in seconds)
git config --global credential.helper 'cache --timeout=3600'
Set default editor
git config --global core.editor "vim"
create a patch from a modified file
git diff <modified file> > this.patch
apply a diff patch
git apply this.patch
search and download first match
youtube-dl ytsearch:damniam
set auto id3 tags
youtube-dl --prefer-ffmpeg --embed-thumbnail --add-metadata --metadata-from-title "%(artist)s - %(title)s" --audio-quality 0 --audio-format mp3 --extract-audio https://www.youtube.com/watch?v=mvK_5nNPKr8
for rom converting
community/ecm-tools 1.03-1 [Installiert]
Error Code Modeler
ecm2bin rom.img.ecm
list all rules
ufw status
disable/enable firewall
ufw enable
ufw disable
systemctl list-unit-files
pipe into vs-code
ps fax | grep code | code-oss # for using open source version of vs code
compare open file to clipboard
workbench.files.action.compareWithClipboard).
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
sleep(1000).then(() => console.log("after 1.5 seconds))
async function main() {
await sleep(20000)
console.log("do something after 20 seconds")
}
main()
proxy an api service and add cors headers and basic auth
load_module modules/ngx_http_headers_more_filter_module.so;
events {
worker_connections 1024;
}
http {
server {
listen 80;
server_name 127.0.0.1;
location / {
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Authorization "Basic ZW5lcmdpY29zOmVuZXJnaWNvcw==";
set $cors "1";
if ($request_method = 'OPTIONS') {
set $cors "${cors}o";
}
if ($cors = "1") {
more_set_headers 'Access-Control-Allow-Origin: $http_origin';
more_set_headers 'Access-Control-Allow-Credentials: true';
}
if ($cors = "1o") {
more_set_headers 'Access-Control-Allow-Origin: $http_origin';
more_set_headers 'Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE';
more_set_headers 'Access-Control-Allow-Credentials: true';
more_set_headers 'Access-Control-Allow-Headers: Origin,Content-Type,Accept';
add_header Content-Length 0;
add_header Content-Type text/plain;
return 204;
}
proxy_pass https://some.url;
}
}
}
A Dockerfile would look like this
FROM alpine:3.7
RUN apk --update --no-cache add nginx nginx-mod-http-headers-more
COPY nginx.conf /etc/nginx/nginx.conf
RUN mkdir /run/nginx
EXPOSE 80
CMD nginx -g 'daemon off;'
nginx dynamic reverse proxy for docker swarm mode
events {
worker_connections 1024;
}
http {
server {
resolver 127.0.0.11;
location ~ /(.*) {
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
set $upstream $1;
proxy_pass http://$upstream;
}
}
}
insert on duplicated for MariaDB/MySQL
async function insert_on_duplicated(table, data){
let insert = knex(table).insert(data).toString();
let update = knex(table).update(data).toString().replace(/^update .* set /i, '');
return await knex.raw(`${insert} on duplicate key update ${update}`);
}
list secrets
kubectl -n kube-system get secret
https://blog.alexellis.io/kubernetes-in-10-minutes/
vuejs without shitty webpack
npm install -D @vue/cli
npx vue init simple web
place key and sected into .aws/credentials
[default]
aws_access_key_id = ...
aws_secret_access_key = ...
and do
./goofys --endpoint ams3.digitaloceanspaces.com melmac /home/ec2-user/t/