lyshie

{
	"src": "/tmp/scratch-desktop/",
	"dest": "/tmp/",
	"arch": "i386",
	"icon": "/tmp/scratch-desktop/resources/Icon.png",
	"categories": [
		"Education"
	]
}

rosa

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

ksafranski

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

nicferrier

#!/bin/sh

REPOSRC=$1
LOCALREPO=$2

# We do it this way so that we can abstract if from just git later on
LOCALREPO_VC_DIR=$LOCALREPO/.git

if [ ! -d $LOCALREPO_VC_DIR ]
then