sudo apt install dirmngr
gpg --keyserver pgpkeys.mit.edu --recv-key  ED444FF07D8D0BF6
gpg -a --export ED444FF07D8D0BF6 | sudo apt-key add -

gpg --keyserver hkp://keys.gnupg.net --recv-key 7D8D0BF6
gpg -a --export 7D8D0BF6 | sudo apt-key add -

#https://docs.kali.org/introduction/download-official-kali-linux-images

sudo vi /etc/apt/sources.list.d/kali.list
deb http://http.kali.org/kali kali-rolling main contrib non-free
# For source package access, uncomment the following line
# deb-src http://http.kali.org/kali kali-rolling main contrib non-free
#https://www.kali.org/news/kali-linux-metapackages/
#https://docs.kali.org/general-use/kali-linux-sources-list-repositories
#https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=107001

#go into the dSYMs folder and run 
dwarfdump --uuid *

# ssh enable keepalive
# via config
sudo vim /etc/ssh/sshd_config
...
ClientAliveInterval 30
TCPKeepAlive yes
ClientAliveCountMax 2
#via command opt
ssh -o ServerAliveInterval=60 myname@myhost.com

#restart sshd
sudo service sshd restart

#socat TCPKeepAlive
socat TCP-LISTEN:8000,reuseaddr,fork,keepalive,keepidle=10,keepintvl=30,keepcnt=2  TCP:127.0.0.1:80

<br />#install X11 Desktop
sudo apt-get install cups
sudo apt install xrdp
sudo apt-get install --no-install-recommends xserver-xorg
sudo apt-get install --no-install-recommends xinit
sudo apt-get install raspberrypi-ui-mods
sudo apt-get install lightdm
sudo reboot

 #install VNC
sudo apt-get update
sudo apt-get install realvnc-vnc-server
sudo apt-get install realvnc-vnc-viewer


# Enable VNC
Alternatively, run the command sudo raspi-config, navigate to Interfacing Options > VNC and select Yes.

#resize GPU Memory
run sudo raspi-config, navigate to Advanced options > Memory Split, and ensure your GPU has at least 128MB.

sudo systemctl enable ssh
sudo systemctl start ssh

#this command  will echo f1.txt  line not contain in f2.txt, import thing : file must sort firt
comm -23 f1.txt f2.txt

Updated npm npm install npm -g
Cleared cache: npm cache clear
Removed node_modules rm -rf node_modules
Reinstalled node_modules, npm install.

#osx pip install scikit-image  skip update numpy
sudo pip install  --ignore-installed six scikit-image

sudo pip install --user scikit-image

date    1020170014 

sudo apt-get  install  -y apache2 vim
sudo a2enmod dav
sudo a2enmod dav_fs
sudo mkdir -p /var/www/webdav

sudo vim /etc/apache2/sites-available/000-default.conf

Alias /webdav  /var/www/webdav

<Location /webdav>
 Options Indexes
 DAV On
 AuthType Basic
 AuthName "webdav"
 AuthUserFile /etc/apache2/webdav.password
 Require valid-user
 </Location>

 sudo htpasswd -c /etc/apache2/webdav.password pi
 sudo chown root:www-data /etc/apache2/webdav.password
 sudo chmod 640 /etc/apache2/webdav.password

 sudo chown -R www-data:www-data  /var/www/webdav

sudo systemctl restart apache2