exAspArk

mkdir ~/vim
cd ~/vim

# Staically linked vim version compiled from https://github.com/ericpruitt/static-vim
# Compiled on Jul 20 2017
curl 'https://s3.amazonaws.com/bengoa/vim-static.tar.gz' | tar -xz

export VIMRUNTIME="$HOME/vim/runtime"
export PATH="$HOME/vim:$PATH"
cd -

exAspArk

# brew install ntfs-3g

sudo mkdir /Volumes/NTFS

diskutil list
sudo ntfs-3g /dev/disk2s1 /Volumes/NTFS -olocal -oallow_other

rsync -v --progress ~/Downloads/something /Volumes/NTFS/

sudo umount /Volumes/NTFS

exAspArk

ffmpeg -i videoplayback.mp4 -i videoplayback.mp3 -c copy -map 0:0 -map 1:0 -shortest result.mp4

exAspArk

# gem install benchmark-ips
require 'benchmark/ips'

Benchmark.ips do |x|
  x.warmup = 0

  x.report("threads") do
    thread = Thread.new { puts 'thread' }
    thread.join
  end

exAspArk

defined_indexes = Model.index_specifications.map { |s| s.fields.map(&:to_s) };
existing_indexes = Model.collection.indexes.map { |i| i['key'].keys };

missing_indexes = defined_indexes - existing_indexes
# => []
extra_indexes = existing_indexes - defined_indexes - [['_id']]
# => []

#################################################################################

exAspArk

This all applies to Ruby 2.1. In some cases a setting is not available in 2.0, this is noted. There is also a different with 1.9, 1.8, and REE --- these are not noted.

All the relevant code is in https://github.com/ruby/ruby/blob/trunk/gc.c

RUBY_HEAP_MIN_SLOTS

default: 10000

The number of heap slots to start out with. This should be set high enough so that your app has enough or almost enough memory after loading so that it doesn't have to allocate more memory on the first request (althogh this probably isn't such a big deal for most apps).

(todo: figure out how big a slot is. i think the answer can be infered from this code.)

exAspArk

curl -I -X OPTIONS \
  -H "Origin: http://EXAMPLE.COM" \
  -H 'Access-Control-Request-Method: GET' \
  http://EXAMPLE.COM/SOMETHING 2>&1 | grep 'Access-Control-Allow-Origin'

exAspArk

openssl genrsa -out CAroot.key 2048
openssl req -new -key CAroot.key -out CAroot.csr # CN should be different from the certificates below
openssl req -x509 -days 1825 -key CAroot.key -in CAroot.csr -out CAroot.crt
cat CAroot.crt CAroot.key > CAroot.pem

openssl genrsa -out mongod.key 2048
openssl req -new -key mongod.key -out mongod.csr
openssl x509 -req -days 1825 -in mongod.csr -CA CAroot.pem -CAkey CAroot.key -CAcreateserial -out mongod.crt
cat mongod.crt mongod.key > mongod.pem

exAspArk

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.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

exAspArk

Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.

Method 1

Backup the public and secret keyrings and trust database

cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/

or, instead of backing up trustdb...