Timing Details

            time_namelookup:  %{time_namelookup}n
               time_connect:  %{time_connect}n
            time_appconnect:  %{time_appconnect}n
           time_pretransfer:  %{time_pretransfer}n
              time_redirect:  %{time_redirect}n
         time_starttransfer:  %{time_starttransfer}n
                            ----------n
                 time_total:  %{time_total}n

curl -w "@curl-format.txt" -o /dev/null -s http://wordpress.com/

Directive isolated scope

app.directive('someDirective', function () {
  return {
    scope: {
      oneWay: '@',
      twoWay: '=',
      expr: '&' // to evaluate in parent scope
    }
  };
});

Version Ranges

Caret Ranges ^1.2.3 ^0.2.5 ^0.0.4

Allows changes that do not modify the left-most non-zero digit in the [major, minor, patch] tuple. In other words, this allows patch and minor updates for versions 1.0.0 and above, patch updates for versions 0.X >=0.1.0, and no updates for versions 0.0.X.

History of published versions

npm view package # see time field

Filter JSON objects stream

cat haystack.json | ruby -rjson -pe 'o = JSON.parse($_); next unless o["needle"]'

Sample script

# /home/evgeniy/.config/systemd/user/parser.service
[Unit]
Description=Parser

[Service]
WorkingDirectory=/home/evgeniy/parser
ExecStart=/home/evgeniy/parser/bin/parser

[Install]
WantedBy=default.target

Sample timer

# /home/evgeniy/.config/systemd/user/parser.timer
[Unit]
Description=Parser task

[Timer]
OnCalendar=hourly
Persistent=true

[Install]
WantedBy=timers.target

Enable with

systemctl --user enable parser.timer

Start with

systemctl --user start parser-fetch-anns.timer

R...

List installed packages

dpkg --get-selections | grep -v deinstall

Which package provides Ruby

dpkg -S /usr/bin/ruby2.2

List all Ruby packages

apt-cache search ruby

Show package details

apt-cache show ruby2.2

apt-cache policy ruby2.2

Sound Settings

gnome-control-center sound

Startup Applications

gnome-session-properties

Restore stock NVidia drivers

http://askubuntu.com/a/163808

https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1166765/comments/9

http://www.webupd8.org/2012/10/how-to-reset-compiz-and-unity-in-ubuntu.html

Install binary NVidia drivers

https://askubuntu.com/questions/450046/black-screen-with-nvidia-drivers-on-ubuntu/450546#450546

Diff, exclude noisy path

git diff master production -- !vendor

Rebase

so "--ours" means the anonymous one rebase is building while "--theirs" means "our branch being rebased"

the side reported as ours is the so-far rebased series, starting with <upstream>,
and theirs is the working branch.
In other words, the sides are swapped.

is "ours" always the upper of the two versions displayed?

Slicing

a[0..x].size // => x + 1

Windows 8

Apply registry fix from http://johnhaller.com/useful-stuff/disable-caps-lock.

Getting Array

CSV(ARGF, headers: [:col1, :col2], converters: :numeric).to_a.map(&:to_h)

Log ActiveRecord SQL in production (ala in dev)

ActiveRecord::Base.logger = Logger.new(STDOUT)

http://meyerweb.com/eric/tools/dencoder/

http://jsbeautifier.org/

Parse JSON request

dec := json.NewDecoder(req.Body)
var target Target
if err := dec.Decode(&target); err != nil {
  return err
}

Slicing

len(a[0:x]) # => x

Godep

Update all third-party packages this package depends on (DOES NOT include test dependencies)

go get github.com/dolzenko/deplist

go list -f '{{.ImportPath}}' ./... | xargs -n 1 deplist | grep -v P | sort -u | xargs go get -u -v

Copy, cut and paste

v to select characters (V to select whole lines).
d to cut (or y to copy).
P to paste before the cursor, or p to paste after.

Search and replace

:%s/foo/bar/g

.vimrc

set wildmenu
set wildmode=longest:full,full

Moving

C-o jump to previous location

Buffers

:bn next buffer

Scroll

^F ^B scroll page up, down

To comment out blocks in vim:

hit ctrl+v (visual block mode)
use the down arrow keys to select the lines you want (it won't highlight everything)
Shift+i (capital I)
insert...

Shutdown HDD

sudo hdparm -y /dev/sda

Open files

lsof -i -n

Format USB

sudo fdisk -l
sudo umount /dev/sdc4
sudo mkfs.vfat /dev/sdc4

Normalize line endings in projects

find . -type f \! -path \*/\.git/\* -exec dos2unix –quiet {} \;

Infinite (Ruby syntax like) loop

 while true; do cmd; done

BasicObject
  Exception
    MonitorMixin::ConditionVariable::Timeout
    NoMemoryError
    ScriptError
      LoadError
        Gem::LoadError
      NotImplementedError
      SyntaxError
    SecurityError
    SignalException
      Interrupt
    StandardError
      ArgumentError
        Gem::Requirement::BadRequirementError
      EncodingError
        Encoding::CompatibilityError
        Encoding::ConverterNotFoundError
        Encoding::InvalidByteSequenceError
  ...

Prefix +

d - detach
" - split
SPC - next layout
o - next pane
[ - copy mode
M-v - scroll up
C-v - scroll down
q - quit

tmux at - attach

-S or --chop-long-lines
  Causes lines longer than the screen width to be chopped (truncated) rather than wrapped. Also works after file is opened (`- S ENTER`)
  
-n or --line-numbers
  Suppresses line numbers.     

Shell: ln -s EXISTING NEW

Ruby: alias NEW EXISTING

Git: git branch NEW EXISTING

Time.now.to_i / 3600

require 'benchmark'
Benchmark.measure { }
=> [user, system, user+system, wall]