opencv 가 리눅스에서 debug postfix를 지원하지 않는 이유.

http://stackoverflow.com/questions/7396564/where-to-place-find-debug-library-on-linux

* 릴리즈 컴파일도 디버그가 가능하다?
* 의문 : 변수값 읽는건 안될텐데. 참고사항.

bash 디버깅

http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_02_03.html


하드추가하기.
/etc/fstab
~~

http://www.mervine.net/executing-bash-from-python

Installing ubuntu on Legion Y520

This is a review for how I install ubuntu and drivers on Legion Y520.

• Ubuntu 
• On my case, I installed ubuntu 16.04
• Kernel upgarde for latest version
• Nvidia graphic card driver 
• For GTX1050(Ti)
• Solution for missing wireless connection

1. Install ubuntu with usb boot disk .
https://www.ubuntu.com/download/desktop/create-a-usb-stick-on-ubuntu

2. Fix missing wireless connection
Thanks for https://askubuntu.com/questions/587743/wifi-hard-blocked/587760

When Install ubuntu  16.04 LTS at Legion Y520, OS can't detect wifi.
To fix this, just command

$ sudo tee /etc/modprobe.d/ideapad.conf <<< "blacklist ideapad_laptop"
and then reboot.



Before do that, "rfkill list" shows Wireless LAN hard blocked: Yes.
But after rebooting, no more hard block and no more problem with wifi.


That's all. Missing Wifi is fixed with just two commands.


3. Install nvidia driver (Update on 2018/ 4/ 17. Thanks to Leonardo Gonzales for comment.)


After connect internet (wifi or with ethernet wire), type following command

$ software-properties-gtk --open-tab=4

And select nvidia driver as follow.



This is also solution for freezing when shutdown/reboot/restart ubuntu 16.04.4.
When you try to shutdown ubuntu on cui-mode (ctrl+alt+f1), if you see message including "nouveau drm failed to idle channel ~~", then just installing nvidia driver instead of using xorg will solve your problem.

https://askubuntu.com/questions/600467/blackscreen-failed-to-idle-channel

텐서플로우 한글 메뉴얼

https://tensorflowkorea.gitbooks.io/tensorflow-kr/content/

ssh tip

https://stackoverflow.com/questions/625409/how-do-i-put-an-already-running-process-under-nohup

http://stackoverflow.com/questions/32221168/allow-ssh-for-specific-ip-address-and-block-all-other-servers-using-etc-hosts-a

About tee command,. to unbuffer
http://stackoverflow.com/questions/11337041/force-line-buffering-of-stdout-when-piping-to-tee

https://unix.stackexchange.com/questions/26728/prepending-a-timestamp-to-each-line-of-output-from-a-command