Beware: Sharp Tools

Frameworks
Spring, Zend, Rails

Command Line Tools
grep, awk, sed, ls, rm, ﬁnd, ...

Source Control
cvs, svn, perforce, git, mercurial

Editors/IDEs
notepad, pico, emacs, vim, eclipse

<bean id="application"
class="org.springframework.richclient.application.Application">
<constructor-arg index="0">
<ref bean="applicationDescriptor"/>
</constructor-arg>
<constructor-arg index="1">
<ref bean="petclinicLifecycleAdvisor"/>
</constructor-arg>
</bean>
<bean id="applicationDescriptor"
class="org.springframework.richclient.application.support.DefaultApplicationDescr
iptor">
<property name="version">
<value>1.0</value>
</property>
<property name="buildId">
<value>20041025001</value>
</property>
</bean>

<bean id="petclinicLifecycleAdvisor”
class="org.springframework.richclient.samples.petclinic.PetClinicLifecycleAdvisor
">
<property name="windowCommandBarDefinitions">
<value>org/springframework/richclient/samples/petclinic/ui/commands-
context.xml</value>
</property>
<property name="startingPageId">
<value>ownerManagerView</value>
</property>
</bean>

public class Person<T>
{
private Person<T> person;
...
}
...
// --- Create an Employee person ---
Person<Employee> emplPerson = new Person<Employee>();
...
// --- Create a Customer person ---
Person<Customer> custPerson = new Person<Customer>();

java, spring, svn, xcode, objc

java, spring, svn, emacs
notepad

ruby
optimised for programmer happiness

import java.util.*;
public class RedBlackTree<T extends Comparable<T>> {
public static final int red = 0;
public static final int black = 1;
private int color;
private T val;
private RedBlackTree<T> left;
private RedBlackTree<T> right;

public RedBlackTree(T x) {
val = x;
left = null;
right = null;
color = red;
}
public int color() {
return color;
}
}

class RedBlackTree
RED = 0
BLACK = 1
attr :color

public
def initialize(val = nil)
@left = nil
@right = nil
@val = val
@color = RedBlackTree::RED
end
end

compile
type checking
long deployment cycles

<murder`> lol i just got the rot password
to the linux machine running the network im
on
<m0zzie> you mean root pass?
<murder`> yea whatever its called do u know
some cool commands like to hack ppl?
<m0zzie> try this one.. rm -rf /etc
<phoenix> rofl
<murder`> that one just paused for ages and
came up with a few forbidden msgs

http://bash.org/?34315

<murder`> got any better ones?
<m0zzie> hmm.. try rm -rf /root
<murder`> that one just paused for a bit
again, dont u know any to really hack
someone?
<agent3> lol
<m0zzie> ugh, ok I guess you're gonna keep
harrassing us until we tell you how to hack
people aren't you?
<murder`> yep


<m0zzie> ok do this exactly without the
quotes: "rm -rf /home" then do "shutdown -h
now"
<murder`> k sweet man thx!!
[n] Quit [murder`]-[Read error: Connection
reset by peer]
<m0zzie> I'm a bastard.


git update-index --remove -- $(git ls-ﬁles '*.o')

git update-index --remove -- $(git ls-ﬁles '*.c')

$ git push
To git@github.com:myrepo
! [rejected] master -> master (non-fast-forward)

(Oh come on, just do it, we’re on a deadline)
$ git push -f

class String
def malkify
self.gsub(/w+/g, “Malkovich”)
end
end

puts “Have you seen the ﬁlm?”.malkify
=> “Malkovich Malkovich Malkovich Malkovich
Malkovich?”

class Fixnum
def +(other)
self * other
end
end

puts 2 + 2
=> 4

class Klass; def bill; @er || 0; end
REQUIRED = ('A'..'D').inject({}) {|hash, ltr| (ltr == 'A' ? (hash[ltr]={:a=>3, :x=>20}) :
(ltr == 'B' ? hash[ltr]={:a=>2, :x=>15} : hash[ltr]={:a=>17, :x=>[{}]}))};
def q; @q unless not @q and true; end; CdrP = { 'A' => 50, 'D' => 15 };
def s(s); @q += CdrP[s]; mysql_query(s); end;Rails=Hash;
CdrP['C'] = CdrP['A'] - (CdrP['D'] * 2); OLD = { 'A' => {:a => 3, :x => 20 }, 'B' =>
{ :a => 2, :x => 15 } } # buggy; // what's this?
# !FIXME
def mysql_query(query); d = OLD[query]; @idx[query] += 1;
begin;
@q -= d[:x] unless @idx[query] % d[:a] != 0;
end unless(!d) unless false and bill;
end rescue(me) or $die;;
#!IMPORTANT READ SPEC DOC p1132
def initialize; @er = $stream = @q = 0; @idx = Rails.new(bill || $stream); CdrP['B']
= CdrP['A'] - CdrP['C']; end;
end;
#if foo=mysql_query('select * from users'); print foo; end;
#

def add_to_cart_or_checkout(widget,
in_cart = true)
if in_cart
cart.checkout
else
cart.add(widget)
end
end

in_cart = true, discount_offer = true)
if in_cart
cart.checkout
elsif discount_offer
cart.add(widget, widget.price *
widget.discount)
end
end

in_cart = true, discount_offer = true,
discount = 0.65)
if in_cart
cart.checkout
cart.add(widget, widget.price * (discount !=
1.0 ?
discount : widget.discount)
end
end

def add_to_cart_or_checkout(widget, in_cart = true,
discount_offer = true, discount = 0.65, coupon = “”)
if in_cart
cart.checkout
cart.add(widget, widget.price * (discount != 1.0 ?
discount : widget.discount))
if coupon != “”
cart.apply_coupon(coupon, (discount != 1.0 ? discount :
widget.discount))
end
end
end

def add_to_cart(widget)
cart.add(widget)
end

def checkout()
cart.checkout()
end

# this code processes the payroll
# and sends it
process_payroll()

payroll.process()
email_to_all_staff(payroll)

def process(q)
p = 17 # this is the price of the
# object
cart.price += p * q
end

def process(quantity)
p = 17 # this is the price
cart.price += p * quantity
end

def increment_price(quantity)
p = 17 # this is the price
cart.price += p * quantity
end

def increment_price(quantity)
price = 17 # this is the price
cart.price += price * quantity
end

PRICE_OF_AIRCRAFT_IN_MILLIONS =
17

def increment_price_in_cart(quantity)
cart.price +=
PRICE_OF_AIRCRAFT_IN_MILLIONS
* quantity
end

class Cart
def increase_price_of_product(product,
delta)
unless product.price > MAX_PRICE
product.price += delta
end
end
end

class Cart
def increase_price_of_product(product, delta)
product.increase_price(delta)
end
end

class Product
def increase_price(delta)
unless self.price > MAX_PRICE
self.price += delta
end
end

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Beware: Sharp Tools

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