#include <chrono>

int main() {
	std::chrono::time_point <std::chrono::system_clock, std::chrono::duration<double, std::milli>> then = std::chrono::high_resolution_clock::now();;

	// ... do something ...

	std::chrono::time_point <std::chrono::system_clock, std::chrono::duration<double, std::milli>> now = std::chrono::high_resolution_clock::now();;
	double elapseTimeInMS = (now - then).count();

	return 0;
}

Shorter:

#include <chrono>

using namespace std;

int main() {
	auto then = chrono::high_resolution_clock::now();

	// ... do something ...

	auto now = chrono::high_resolution_clock::now();
	double elapseTimeInMS = chrono::duration<double, milli>(now - then).count();

	return 0;
}

This is about GStreamer on Linux.

Note: You will lose all the links (hyperlink, internal-link) in PDF with this way

Create latex file numbered.tex:

1. Go to about:config, enable config toolkit.legacyUserProfileCustomizations.stylesheets.
2. Go to about:support > Profile Directory > Open Directory. Firefox profile directory will be openned in new window.
3. In your profile directory, create folder chrome if not exist.
4. Go to folder chrome, create file userChrome.css.
5. Copy content from multi-row_tabs.css into userChrome.css.
6. Restart Firefox.

• Right click on the dock > Layouts > Configure…
• In Settings window, go to Preferences tab
• In Actions section > Tick Press ⌘ to activate Application Launcher

Or

• Open ~/.config/kwinrc, then add:

  ...
  [ModifierOnlyShortcuts]
  Meta=org.kde.lattedock,/Latte,org.kde.LatteDock,activateLauncherMenu
  ...
  

• Reload KWin:

  $ qdbus org.kde.KWin /KWin reconfigure
  

  Github QA

Put information for gen key in a text file, eg. gpg_gen_key:

Key-Type: 1
Key-Length: 2048
Subkey-Type: 1
Subkey-Length: 2048
Name-Real: My Name
Name-Email: [email protected]
Expire-Date: 0
Passphrase: secretpass

Gen key with above text file:

gpg --batch --gen-key gpg_gen_key

Required package

• For Debian: apache2-utils.

  sudo apt-get install apache2-utils
  

• For Fedora: httpd-tools.

  sudo dnf install httpd-tools
  

Create password file

Run with -c option if /etc/nginx/.htpasswd does not exist:

sudo htpasswd -c /etc/nginx/.htpasswd user1

If .htpasswd already exists, don’t use -c option or file will be overwritten.
To add more user to password file.

sudo htpasswd /etc/nginx/.htpasswd user2

What is Mosh

Mosh is a replacement for interactive SSH terminals.

Mosh doesn’t listen on network ports or authenticate users. The mosh client logs in to the server via SSH, and users present the same credentials (e.g., password, public key) as before. Then Mosh runs the mosh-server remotely and connects to it over UDP.

Add-ons: History AutoDelete

Features:

• Auto delete expired history. For example, you don’t want to keep history since 30 days ago.

• Auto delete a specific domain’s history. There are obvious websites we don’t want to keep in our history 🙈.