otzoran

#!/usr/bin/env bash
# curl -o xx https://gist.githubusercontent.com/otzoran/0214f5f9e817c54c597da31dd86c9162/raw

TIM=60
PROG=$(basename $0)

trap 'echo "ERROR $? at ${PROG}:$LINENO - [$BASH_COMMAND]"' err

function wait_confirmation
{

otzoran

Add to bashrc

alias yaml2json="ruby -ryaml -rjson -e 'puts JSON.pretty_generate(YAML.load(ARGF))'"
alias json2yaml="ruby -ryaml -rjson -e 'puts YAML.dump(JSON.parse(STDIN.read))'"

WIIG4

take a horrible json (such as packer template), convert it to yaml, edit it (vi, sed, awk) and convert back

side dish

otzoran

Problem

macOS Sierra 10.12.5
VBoxManage --version = 5.1.24r117012
Win VM paused, mac => sleep; on wakeup attaempt to rev the VM yields error:
The virtual machine '[name]' has terminated unexpectedly during startup because of signal 6.
NS_ERROR_FAILURE (0x80004005)

Googling

otzoran

# pbcopy (on Mac OS), copies stdin to the X clipboard, the aliases created here simulate that. 
# need the 'xsel' package
if [[ $(uname -s) == "Linux" && -x /usr/bin/xsel ]]; then
  alias pbcopy='xsel --clipboard --input'
  alias pbpaste='xsel --clipboard --output'
fi

otzoran

The proc is explained here

otzoran

Installing Guest Additions on Debian

Follow these steps to install the Guest Additions on your Debian virtual machine:

sudo -i
apt-get update && apt-get upgrade
apt-get install build-essential module-assistant
# Configure your system for building kernel modules by running:
m-a prepare

otzoran

# vim: set filetype=sh :

# Purpose
# set environment variables for EC2_URL EC2_HOME JAVA_HOME CLASSPATH
# required by ec2-api-tools, used by other tools (e.g. vagrant)

# Usage: 
# source this
# create local env.monsoon in a project's subdir defining:
# export AWS_PROJECT="MOCONS / rmjen"

otzoran

The old way

if tty -s; then
  echo "interactive"
fi

Cons

This method does the job, but invloves process invocation (fork/exec) of tty, which is expensive in terms of performance.
But there's a worse side-effect:
If PATH is empty or wrong, calling tty will fail. When sourced for a login shell,

otzoran

NTP Server Israel

source: isoc-il

timeserver.iix.net.il   # 192.114.62.250 stratum-2

otzoran

#!/usr/bin/env bash

# Author: Ori Tzoran, based on idea and gist by aaronzirbes (see evolution below)
# Tested on Mac OS X 10.10.2 (14C109) 

set -e
## verify root runs this
[[ $(id -u) == 0 ]] || { echo need root; exit 1; }

#set -vx