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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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non-interactive elements
      ✓ should identify `a` as a non-interactive element (1ms)
      ✓ should identify `area` as a non-interactive element
      ✓ should identify `article` as a non-interactive element (1ms)
      ✓ should identify `dd` as a non-interactive element
      ✓ should identify `dfn` as a non-interactive element
      ✓ should identify `dt` as a non-interactive element
      ✓ should identify `fieldset` as a non-interactive element
      ✓ should identify `figure` as a non-interactive element
      ✓ should identify `frame` as a non-interactive element

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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

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/* Parsing simple USART commands
 * -----------------------------
 * For more information see
 * http://www.adnbr.co.uk/articles/parsing-simple-usart-commands
 *
 * 996 bytes - ATmega168 - 16MHz
 */

#define F_CPU 16000000UL
#define BAUD 19200

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/* MAX7219 Interaction Code
 * ---------------------------
 * For more information see
 * http://www.adnbr.co.uk/articles/max7219-and-7-segment-displays
 *
 * 668 bytes - ATmega168 - 16MHz
 */

// 16MHz clock
#define F_CPU 16000000UL

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)