# This method if the files has no extentions. $ for file in *; do mv "$file" "$file.png"; done # This method if the files has extentions before. $ for …

One method is a bash *for loop*. Easy convert to .mp3 files: mkdir outputs/ for f in *.mp4; do ffmpeg -i "$f" "outputs/${f%.mp4}.mp3"; done For converting only .mp4 files: mkdir …

Add this in your file of /etc/bash.bashrc, makesure you logged in as root. while true; do # Don't exit at Ctrl-C trap "echo" SIGINT printf "n" echo -n " Who …

E11000 duplicate key error index in mongodb. I found this error after migrating my field from “unique” to “non-unique”. And in this problem we use mongoengine for flask. First, i …

Remove all files .pyc with recrusive method - This method simple but important. Example in your project dir is like this: project_dir/ __init__.py __init__.pyc something.py something.pyc ... core/ __init__.py __init__.pyc …

How to make cronjob for Django in Hosing, VPS or Server. This config also what we do in this site. For example, in your file of /yourproject/yourapp/management/commands/autobackup.py from django.core.management.base import …

Quick to understand git step by step. Git is a version control system that is used for software development and other version control tasks. As a distributed revision control system …

Building command line programs has been a long time passion of mine. There’s something magical about making a simple, intuitive, and composable CLI. There’s also nothing more beautiful than chaining …

These errors indicate that there is some problem with DNS. check cat /etc/resolv.conf for your DNS settings. And add following name server in /etc/resolv.conf for temporary or in /etc/resolvconf/resolv.conf.d/head for …