Helpful Commands for Daily Use

Disk usage

df -h

Find Size of a Dir and its content

du -hs /path/to/dir

Find Size of a Dir individual folders and sort by size

du -h | sort -h

Add user to sudoers file

su root 
nano /etc/sudoers

Then add the user below admin user like below syntax.

{YOUR_USERNAME} ALL=(ALL)  ALL

use SUDO without password prompt for current user

sudo visudo

In the bottom of the file, add the following line:

$USER ALL=(ALL) NOPASSWD: ALL

Check port usage

sudo lsof -i :8000

Trigger Kubernetes Job from CronJob

kubectl create job --from=cronjob/<cronjob-name> <job-name-to-be-created> -n <namespace-name>

Find the current connection slot usage and limits in PostgreSQL

   select max_conn, used, res_for_super,((max_conn - res_for_super)-used) as res_for_normal
   from
   (select count(*) used from pg_stat_activity) t1,
   (select setting::int res_for_super from pg_settings
   where name='superuser_reserved_connections') t2,
   (select setting::int max_conn from pg_settings where name='max_connections') t3

Enable COPY PASTE between HOST machine and Virtualbox machine

https://codetryout.com/vbox-guest-additions-ubuntu-22/

Kdenlive Noise Suppressor Plugin for Ubundu

https://kentwest.neocities.org/westk/librnnoise

Export all env vars from .env before running a script

export $(cat .env | xargs) && python main.py