ubuntu init.d runlevel update-rc.d

Ubuntu startup script
http://felix-lin.com/linux/debianubuntu-%E6%96%B0%E5%A2%9E%E9%96%8B%E6%A9%9F%E8%87%AA%E5%8B%95%E5%9F%B7%E8%A1%8C%E7%A8%8B%E5%BC%8F/

/etc/init.d/blah

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

#! /bin/sh # /etc/init.d/blah #   # Some things that run always touch /var/lock/blah   # Carry out specific functions when asked to by the system case "$1" in   start)     echo "Starting script blah "     echo "Could do more here"     ;;   stop)     echo "Stopping script blah"     echo "Could do more here"     ;;   *)     echo "Usage: /etc/init.d/blah {start|stop}"     exit 1     ;; esac   exit 0

update-rc.d blah defaults

update-rc.d blah start 20 2 3 4 . stop 80 0 1 6 .
start 20th in 2/3/4 runlevel
update-rc.d -f blah remove

key: nginx remove 405 html php7.0-fpm

https://segmentfault.com/a/1190000014027697delete ini file or directory will cause this issue
solution:
purge remove then install again

key: nginx remove 405 html php7.0-fpm

dpkg --get-selections | grep nginx
sudo apt-get --purge remove nginx-common

Nvidia eDP out

2 method rebuild eDP video out

1. Device tree .
2. build bsp

dlib FR introduction

dlib

• https://github.com/davisking/dlib/blob/master/python_examples/face_recognition.py
• facerec.compute_face_descriptor(img, shape) 沒有 alignment要另外做chip

Drowsiness detection with OpenCV by Adrian Rosebrock on May 8, 2017 in dlib, Facial Landmarks, Tutorials

(Faster) Facial landmark detector with dlib

by Adrian Rosebrock on April 2, 2018 in dlib, Facial Landmarks

OpenCV Face Recognition

by Adrian Rosebrock on September 24, 2018 in Deep Learning, Faces, Tutorials

Face Alignment with OpenCV and Python

by Adrian Rosebrock on May 22, 2017 in dlib, Facial Landmarks, Tutorials

Pulsed indirect Time of flight (iTOF)

https://www.youtube.com/watch?v=iuf2FTTIjwY&feature=youtu.be

sudo , wifi connect command

• To see list of saved connections, use (<SavedWiFiConn>)

  nmcli c
  

• To see list of available WiFi hotspots (<WiFiSSID>)

  nmcli d wifi list

sudo nmcli d wifi connect iSSA_ASUS_50_2.4G password 54098542 iface wlan0

Reference:

https://askubuntu.com/questions/461825/how-to-connect-to-wifi-from-the-command-line

www-data        ALL=(ALL) NOPASSWD: /usr/bin/amixer

PHP system call system/exec/shell_exec difference and sudo

PHP system call system/exec/shell_exec difference

• system()
  • $last_line = system('ls', $return_var);
  • system() 會將輸出內容直接印出, 所以若於網頁, 會將所有回傳內容都顯示於頁面上.
  • $last_line: 只能取得最後一行的內容
  • $return_var: 取得系統狀態回傳碼
• exec()
  • exec('ls', $output, $return_var);
  • $output: 回傳內容都會存於此變數中(儲存成陣列), 不會直接秀在頁面上.
  • $return_var: 取得系統狀態回傳碼
• shell_exec()
• $output = shell_exec('ls');
• $output: 回傳內容都會存於此變數中(儲存成純文字內容), 不會直接秀在頁面上.

www-data        ALL=(ALL) NOPASSWD: /usr/bin/amixer

Reference:

https://blog.longwin.com.tw/2013/06/php-system-exec-shell_exec-diff-2013/

nginx dependent file

        sudo apt-get install nginx nginx-common nginx-core fcgiwrap php7.0 apache2-utils

        sudo systemctl restart php7.0-fpm nginx

        #systemctl status nginx.service

.htpasswd add script

        sudo htpasswd -cb /etc/nginx/cam.htpasswd root pass