A list of useful commands for the FFmpeg command line tool.
Download FFmpeg: https://www.ffmpeg.org/download.html
Full documentation: https://www.ffmpeg.org/ffmpeg.html
Eric Bidelman has documented some of the common workflows possible with headless Chrome over in https://developers.google.com/web/updates/2017/04/headless-chrome.
If you're looking at this in 2016 and beyond, I strongly recommend investigating real headless Chrome: https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md
Windows and Mac users might find using Justin Ribeiro's Docker setup useful here while full support for these platforms is being worked out.
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
Not all random values are created equal - for security-related code, you need a specific kind of random value.
A summary of this article, if you don't want to read the entire thing:
- Don't use
Math.random()
. There are extremely few cases whereMath.random()
is the right answer. Don't use it, unless you've read this entire article, and determined that it's necessary for your case. - Don't use
crypto.getRandomBytes
directly. While it's a CSPRNG, it's easy to bias the result when 'transforming' it, such that the output becomes more predictable. - If you want to generate random tokens or API keys: Use
uuid
, specifically theuuid.v4()
method. Avoidnode-uuid
- it's not the same package, and doesn't produce reliably secure random values. - If you want to generate random numbers in a range: Use
random-number-csprng
.
You should seriously consider reading the entire article, though - it's
// === Arrays | |
var [a, b] = [1, 2]; | |
console.log(a, b); | |
//=> 1 2 | |
// Use from functions, only select from pattern | |
var foo = () => [1, 2, 3]; |
# 0 is too far from ` ;) | |
set -g base-index 1 | |
# Automatically set window title | |
set-window-option -g automatic-rename on | |
set-option -g set-titles on | |
#set -g default-terminal screen-256color | |
set -g status-keys vi | |
set -g history-limit 10000 |
This gist had a far larger impact than I imagined it would, and apparently people are still finding it, so a quick update:
- TC39 is currently moving forward with a slightly different version of TLA, referred to as 'variant B', in which a module with TLA doesn't block sibling execution. This vastly reduces the danger of parallelizable work happening in serial and thereby delaying startup, which was the concern that motivated me to write this gist
- In the wild, we're seeing
(async main(){...}())
as a substitute for TLA. This completely eliminates the blocking problem (yay!) but it's less powerful, and harder to statically analyse (boo). In other words the lack of TLA is causing real problems - Therefore, a version of TLA that solves the original issue is a valuable addition to the language, and I'm in full support of the current proposal, which you can read here.
I'll leave the rest of this document unedited, for archaeological