Multiple git accounts

Using multiple ssh keys for multiple gits:

https://gist.github.com/jexchan/2351996

Add the ssh keys on github

Some possible "git config --list" options are "--local" and "--global"
If you don't specify --global, it takes the local config by default.

To display the actual  “git config” do:
git config --list

git config user.name

git config user.email

Before you commit, you need to be sure you are using the correct one.
You can set it by doing:

git config user.name "abc"

git config user.email "abc@abc.com"

The local config will be saved in .git/config
The global config is saved in ~/.gitconfig

"url" must be a git@something  in .git/config, should not be https. If it is https, use:

“git remote set-url origin git@github.com:me/gg-linux.git”

It will change your .git/config

_______ git clone
Even if the keys are on github, you may want to use a specific name/email
You can use
git clone XX -c user.name=toto -c user.email=toto@toto.com (this will set .git/config)
or
git config --global user.name "xxx"
git config --global user.mail "xxx"
git clone git@github.com:youruser/myj-gh     (need ssh keys)

Google services empty the battery

Android is up to date.
Google Services is making continuous network access and empty the battery. It stops when network is disabled.

solution: register for the Google Services beta program. That's the only way to update/change Google Services
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Mac survival kit

• ask different
• https://apple.stackexchange.com/
• fonctionalities
• fn + F12.  go to dashboard (calendar, calculator)
• about .bash_profile
• https://stackoverflow.com/questions/49997987/where-is-the-profile-file-on-mac/49998052#49998052
• MacOS (formerly OS X) is based on BSD Unix
• https://en.wikipedia.org/wiki/MacOS#/media/File:Unix_timeline.en.svg
• list of installs made:
• less /Library/Receipts/InstallHistory.plist
• machine info
• sysctl -n machdep.cpu.brand_string
• system_profiler | grep Processor
• system_profiler
• updatedb
• (base) lee@a8:~$ sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
• (base) lee@a8:~$ sudo /usr/libexec/locate.updatedb
• (base) lee@a8:~$ locate logs
• install kdiff3
• brew cask install https://raw.githubusercontent.com/Homebrew/homebrew-cask/6a96e5ea44803e52a43c0c89242390f75d1581ab/Casks/kdiff3.rb 
• if you need to untar things like mvn, you can do so in /usr/local using sudo. Other folders are protected even using sudo 
• colors
• console and vi: 
• go to terminal (console) / preferences / Profiles / Basic / ANSI Colors
• change them
• brew
• brew list
• brew doctor
• brew services list
• brew services info docker-machine 
• brew services start tomcat
• zsh
• ps -ef,   htop prefered
• sometimes buggy, switch to bash 
• ex: find . |grep ".py"|xargs grep fill  (not working on my zsh)
• this works on zsh but not on sh for big files
• sort -u toto.txt > out.txt

• network (use bash)

• tcpdump -n -A -p -i lo0 host 127.0.0.1 > tmp.txt

• 
  

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install nvidia driver on Ubuntu

https://websiteforstudents.com/install-proprietary-nvidia-gpu-drivers-on-ubuntu-16-04-17-10-18-04/

lshw -c video

(driver for NVidia GK107GL [Quadro K600]:
sudo apt install nvidia-346)

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Data types comparison

\	JSON	Python	STL
object	JSON object {   "fist_name" : "John",   "last_name" : "Doe" } (necessarely key-value pairs, also called properties, key unique)	object	object
immutable list		tuple t="a",b,123 or t=("a",b,123)	tuple
dynamic array, ordered, value not unique	JSON array ["a","b","c","a"']	not supported, use lists instead	vector
doubly-linked list, key not unique		list [a,b,c,a]	list
tree, sorted, key unique		set {a,b,c}	set
map, key unique	dictionary (actually object) {"a":"b", "c":"d"}	dictionary {"a":"b", "c":"d"}	map

dynamic array: get realloc depending on its evolving size.
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