francois

Let's say you have a Bash shell script, and you need to run a series of operations on another system (such as via ssh). There are a couple of ways to do this.

First, you can stage a child script on the remote system, then call it, passing along appropriate parameters. The problem with this is you will need to manually keep the remote script updated whenever you change it -- could be a bit of a challenge when you have something to execute on a number of remote servers (i.e., you have a backup script running on a central host, and it needs to put remote databases in hot backup mode before backing them up).

Another option is to embed the commands you want to run remotely within the ssh command line. But then you run into issues with escaping special characters, quoting, etc. This is ok if you only have a couple commands to run, but if it is a complex piece of Bash code, it can get a bit unwieldy.

So, to solve this, you can use a technique called rpcsh -- rpc in shell script, as follows:

First, place th

francois

WITH btree_index_atts AS (
    SELECT nspname, relname, reltuples, relpages, indrelid, relam,
        regexp_split_to_table(indkey::text, ' ')::smallint AS attnum,
        indexrelid as index_oid
    FROM pg_index
    JOIN pg_class ON pg_class.oid=pg_index.indexrelid
    JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
    JOIN pg_am ON pg_class.relam = pg_am.oid
    WHERE pg_am.amname = 'btree'
    ),

francois

#!/usr/bin/perl
#
# Brad's el-ghetto do-our-storage-stacks-lie?-script
#

sub usage {
    die <<'END';
Usage: diskchecker.pl -s <server[:port]> verify <file>
       diskchecker.pl -s <server[:port]> create <file> <size_in_MB>
       diskchecker.pl -l [port]

francois

require "bigdecimal"
montant = BigDecimal.new(ARGV[0])

GSTpercent = 5 
QSTpercent = BigDecimal.new("8.5")

myGST = montant * GSTpercent / 100 
myQST = (montant + myGST) * QSTpercent / 100 

total = montant + myGST + myQST

francois

{"rp":
  {"AdSpot": [
    {"1": {"mt": {"im": {"va": 141}, "ck": {"va": 13}}}},
    {"2": {"mt": {"im": {"va": 237}, "ck": {"va": 12}}}},
    {"3": {"mt": {"im": {"va": 671}, "ck": {"va": 21}}}}]
  },
 "_id": ObjectID("a")
}

{"rp":

francois

Ubuntu 9.04 Jaunty 32-bit server AMI taken from (http://alestic.com/): ami-0d729464

Useful guides:

• http://articles.slicehost.com/2009/1/6/ubuntu-intrepid-ruby-on-rails
• http://devblog.michaelgalero.com/2008/11/27/setting-up-your-ubuntu-server-for-merb/

Panda user

See this guide for details about securing an EC2 instance:

francois

module AssertForm
  # assert_form posts_url, :put do
  #   assert_text_field :post, :title
  #   assert_text_area  :post, :body
  #   assert_submit
  # end
  def assert_form(url, http_method = :post)
    http_method, hidden_http_method = form_http_method(http_method)
    assert_select "form[action=?][method=#{http_method}]", url do
      if hidden_http_method