Linux

Edit bashrc file (~/.bashrc)

Convert OGG to MP3

ffmpeg -v 5 -y -i file.m4a -acodec libmp3lame -ac 2 -ab 192k file.mp3

Convert M4A to MP3

ffmpeg -i file.ogg file.mp3
#Or
ffmpeg -i file.{ogg,mp3}

Method 1 : Install and run drush as described in this article
This is the recommended method

Local bin folders
$HOME/.local/bin (~/.local/bin)
$HOME/bin (~/bin)

Add to path manually

PATH=$PATH:$HOME/.local/bin:$HOME/bin
export PATH

User specific environment and startup programs

Install Apache 2 server

sudo apt install apache2

Install MySQL Server

sudo apt install mysql-server

Test Disk Write Performance With dd Command

dd is a basic command une in all linux distributions to copy data. You can also use this feature to test dis performance.

Step 1 : Install pptp client.

sudo apt-get -y install pptp-linux

Step 2 : Setup PPTP Client

Add secret:

File : /etc/ppp/chap-secrets
You can use:
sudo nano /etc/ppp/chap-secrets

rsync is a powerfull tool to synchronize the files and directories. Can be use for local or remote using ssh.

Source Tutorial : https://www.thegeekstuff.com/2010/09/rsync-command-examples/

Syntax
rsync options source destination

Mount a linux partition encrypted with LUKS using terminal

Install Crypsetup:

sudo apt-get install cryptsetup

To decrypt the volume:

sudo cryptsetup luksOpen /dev/sda1 my_encrypted_volume

/etc/rc.local is depricated on debian 9.

You can try this to add it. (Not tested)

1) Create the file : /etc/systemd/system/rc-local.service

# nano /etc/systemd/system/rc-local.service

2) Copy this text.