How Linux is Built
https://www.youtube.com/watch?v=yVpbFMhOAwE

for Android devices
https://kingroot.net/

vsftpd
https://security.appspot.com/vsftpd.html
-> set up the shell as /bin/false for FTP-user
shells are defined at /etc/shells
cat /etc/shells 
# /etc/shells: valid login shells
/bin/sh
/bin/dash
/bin/bash
/bin/rbash
/usr/bin/screen
/usr/bin/tmux

check whether the /bin/false exist in current system and then add the /bin/false to /etc/shells


SSH client for Windows
http://www.swish-sftp.org/

Microsoft attitude:
http://www.theregister.co.uk/2001/06/02/ballmer_linux_is_a_cancer/

Microsoft really does love Linux
http://www.theverge.com/2016/9/15/12926288/microsoft-really-does-love-linux


https://techcrunch.com/2016/11/16/microsoft-joins-the-linux-foundation/

uname -a all information
uname -r kernel version


Ubuntu kernels
http://kernel.ubuntu.com/~kernel-ppa/mainline/

http://linuxcnc.org/

Realtime kernel
https://wiki.archlinux.org/index.php/Realtime_kernel

http://www.jackaudio.org/

check memory
free -h

memtest86+
http://www.memtest.org/

SSD:
TBW
http://thessdguy.com/comparing-dwpd-to-tbw/

Swap
https://help.ubuntu.com/community/SwapFaq
http://www.omgubuntu.co.uk/2016/12/ubuntu-17-04-drops-swaps-swap-partitions-swap-files
http://askubuntu.com/questions/103915/how-do-i-configure-swappiness

http://www.linuxfromscratch.org/