Snippet-Bibliothek

Getestete Snippets zum Kopieren für Python, Flask, JavaScript, SQL, HTML, CSS und Bash. Jedes lässt sich im Playground öffnen.

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5 Snippets

bash

Safe script header

Stop on errors, unset variables and failed pipes, and clean up on exit.

#!/usr/bin/env bash
set -Eeuo pipefail

tmp="$(mktemp -d)"
cleanup() { rm -rf "$tmp"; }

beginner #scripting#errors

bash

Back up a PostgreSQL database

Dump, compress, and keep only the last 14 backups.

#!/usr/bin/env bash
set -Eeuo pipefail
: "${DATABASE_URL:?set DATABASE_URL}"

dir="/var/backups/app"

intermediate #postgres#backups#cron

bash

Find the biggest files and folders

See what is filling the disk.

df -h /                                   # how full is the disk?
du -xh / 2>/dev/null | sort -rh | head -20    # biggest folders on this filesystem
find /var/log -type f -size +100M -exec ls -lh {} \;   # big log files
journalctl --disk-usage                   # systemd journal size

beginner #linux#disk#admin

bash

Search code fast

Find where something is used, ignoring virtualenvs and builds.

grep -rn --include='*.py' "def create_app" .
grep -rn --exclude-dir={.git,.venv,node_modules,dist} "TODO" .
git grep -n "url_for('main.blog')"        # only tracked files, very fast

beginner #grep#search#git

bash

Wait until a service is up

Retry until a TCP port answers, with a timeout.

wait_for() {
  local host="$1" port="$2" timeout="${3:-30}"
  for ((i = 0; i < timeout; i++)); do
    if (exec 3<>"/dev/tcp/$host/$port") 2>/dev/null; then
      echo "$host:$port is up"; return 0

intermediate #docker#deploy#networking

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Snippet-Bibliothek

Safe script header

Back up a PostgreSQL database

Find the biggest files and folders

Search code fast

Wait until a service is up