Patrick (Rick) Pearson pwpearson

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

10 Scala One Liners to Impress Your Friends

Here are 10 one-liners which show the power of scala programming, impress your friends and woo women; ok, maybe not. However, these one liners are a good set of examples using functional programming and scala syntax you may not be familiar with. I feel there is no better way to learn than to see real examples.

Updated: June 17, 2011 - I'm amazed at the popularity of this post, glad everyone enjoyed it and to see it duplicated across so many languages. I've included some of the suggestions to shorten up some of my scala examples. Some I intentionally left longer as a way for explaining / understanding what the functions were doing, not necessarily to produce the shortest possible code; so I'll include both.

1. Multiple Each Item in a List by 2

The map function takes each element in the list and applies it to the corresponding function. In this example, we take each element and multiply it by 2. This will return a list of equivalent size, compare to o

	Latency Comparison Numbers
	--------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns
	Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms
	Read 4K randomly from SSD* 150,000 ns 0.15 ms

	Check if remote port is open with bash:
	echo >/dev/tcp/8.8.8.8/53 && echo "open"

	Suspend process:
	Ctrl + z

	Move process to foreground:
	fg

	Generate random hex number where n is number of characters:

	# ---------------------------------------------------------------------------
	#
	# Description: This file holds all my BASH configurations and aliases
	#
	# Sections:
	# 1. Environment Configuration
	# 2. Make Terminal Better (remapping defaults and adding functionality)
	# 3. File and Folder Management
	# 4. Searching
	# 5. Process Management

	val realFuture = Future(doRealStuff())
	//timeoutFuture does a spin wait by sleeping on the thread on which it runs, so make sure the ExecutionContext
	//on which it runs is multi-threaded. In an akka based environment, use a scheduler to fulfill a promise with a failure
	//when the timeout duration is complete, and avoid the spin wait
	val timeoutFuture = Future {
	Thread.sleep(timeoutMilliseconds)
	throw new TimeoutException("timeout")
	}
	Future.firstCompletedOf(realFuture :: timeoutFuture :: Nil)

	#!/bin/bash
	read -r -d '' script <<'EOF'
	on run argv
	tell application "iTerm"
	activate
	set myterm to (make new terminal)
	tell myterm
	launch session "Default"
	tell the last session
	repeat with arg in argv

	-- Find more at http://iterm.sourceforge.net/scripting.shtml

	launch "iTerm"

	tell application "iTerm"
	activate

	-- ssh in split panes to my varnish stack
	set myterm to (make new terminal)
	tell myterm