Bike Path

pushd and popd

2012-01-27T13:21:00.000-08:00

pushd saves the current working directory in memory.
popd returns to the path at the top of the directory stack.

Example
[sputnik@localhost html]$ pushd . # push current directory to memory
/var/www/html /var/www/html

[sputnik@localhost etc]$ cd /var/games/ # change directory

[mshnaydman@localhost games]$ popd # returns from directory
/var/www/html
[sputnik@imagick-test html]$

For more information, read the Wiki Page

Resize & write data into image

2012-01-27T12:53:00.000-08:00

I had task to resize image and add unique identifier. See below handful utilities.

- Exiv2 (manage image metadata. Supports IPTC, Efix, XMP and others formats)
Example: Add the field to IPTC
[sputnik@test_hires] iptc -M"add Iptc.Application2.SpecialInstructions blah blah" myfile.jpg

- Imagemagick (resize, edit, view images or more)
Example: Resize image to 200x200 pixels
[sputnik@test_hires] convert -resize 200x200 myfile_input.jpg myfile_output.jpg

- Identify (image characteristics. is a member of the ImageMagick suite of tools)
Example: Get image size
[sputnik@test_hires] identify -format '%w:%h' $source

- File (determine file type)
Example: Get Filename information. For more 'man file'
file -i $filename | cut -d':' -f 2

Astronomy Lectures

2012-01-08T09:37:00.000-08:00

I start getting into Astronomy for last few weeks and find the subject very interested.
Here are 3 lectures by professor David Helfand that I find interesting:

Astronomy Lecture 1: What Is a Star?
Astronomy Lecture 2: Lives of the Stars
Astronomy Lecture 3: Planets Everywhere

There lectures still available in Google Videos.

cd command

2011-12-15T12:19:00.000-08:00

Few most useful b commands
cd - # move back to the previous directory
cd ~ # move into your home directory
cd .. # move up one directory

Umask

2011-12-14T11:06:00.000-08:00

umask is a set of setting default permissions for files or directories that you create on your system.
umask tells the system what permissions to remove from the normal default setting.
umask value can be a three or four digit value.

Global umask value can be change in /etc/bashrc (default value is 0022 or 022).
The extra 0 at the beginning just means that the number is in octal format.
umask can be set temporary using umask command

Example:
umask 077 (Owner - read, write and execute, Group - No Permissions, Others - No Permissions)

How to calculate umasks?
The octal umasks are calculated using bitwise AND of the unary complement of the argument using bitwise NOT. The octal notations are as follows:
Ocatal Value | Permission
0 - read, write and execute
1 - read, write
2 - read, execute
3 - read only
4 - write and execute
5 - write only
6 - execute only
7 - no permissions

Note: Directories must be executable (X) in order to browse them.

Scraping

2011-12-13T12:45:00.000-08:00

LXML is useful Python library for scraping. Here is an example of scraping script

pip install requests
pip install lxml

#! /usr/bin/python
import requests
import lxml
from lxml import html

r = requests.get('https://www.google.com/')
tree = lxml.html.fromstring(r.content)
elements = tree.get_element_by_id("prm")
for el in elements:
 print el.text_content()

Note: It works with Python 2.6.1 (did not work with Python 4). LXML specs

Studio 60

2011-11-22T10:07:00.000-08:00

The show reminds me of Saturday Night Live. Good show, actors and plot. Another great show written by Aaron Sorkin.

MAC Screenshot Command

2011-11-21T14:10:00.000-08:00

command+shift+3 // Full Screenshot

command+shift+4 // Crosshair to allow selection of screenshot area

command+shif+4(then spacebar) // Camera to capture specific screen object. Similar to Digital Camera

Chelsea Piers GYM (Pier 60)

2011-11-21T11:50:00.000-08:00

Almost 3 years ago I stopped going to GYM and slowly gained weight. After some consideration I choose Chelsea Piers that is located 15 min walk from my work. I am planning to go to the gym at least 3 times per week (morning hours before work).

The gym would cost me $55 per paycheck.

I woke up at 5:45AM today and exercise for 45 minutes. I feel better and refreshed.

Import CSV file into MYSQL

2011-11-01T14:55:00.000-07:00


LOAD DATA INFILE 'myfile' INTO TABLE table FIELDS TERMINATED BY ',';

Usage of cat command

2011-10-29T09:51:00.000-07:00

cat command functionality:
1. create
2. view
3. join files

cat is short for catenate (to join things together, end-to-end)
- Create file
cat > file1
 enter text
 more text
# press Enter, CTRL-d to exit

- View file(s)
cat -n filename # will number all lines
cat -b filename # will number all non-blank lines

cat -t filename # all tabs to be shown as ^I
cat -s filename # remove extra blank lines. 1 blank line is allowed.
cat -A filename # combine -t & -s options together

- Join Files
cat test1 test2 # join both files and show output in stdout
cat test1 test2 > test # Join both files and add to stdout

Bash Shortcuts

2011-10-25T18:46:00.000-07:00


GNU Readline Library enable to edit the command line shortcuts. Readline uses emacs key binding. It means a lot of CTRL/ALT keys.

Ctrl+C # Interrupt to exit, terminate the command

Ctrl+D # disconnect from shell

Ctrl+Z # suspend the process, suspend/stop the command

Ctrl+l # clear screen

Ctrl+s # stops the output to the screen

Ctrl+q # allow output to the screen
(If previously stopped using Ctrl+s)

!! - run last command

Ctrl+r # search the history backwards

Ctrl+g # escape from history searching mode

Ctrl+a # go to start of the command line

Ctrl+e # go to end of the command line

Ctrl+f # move forward one character (identical to VIM)

Ctrl+b # move backward one character (identical to VIM)

Ctrl+p # previous command in history

Ctrl+n # next command in history

kill processes that match grep pattern

2011-10-25T09:35:00.000-07:00

I open about 20 copies of the same file. I used the command below to kill them.
kill -9 `ps auwwwx | grep "vim /tmp/continuous_migration.log" | awk '{print $2}' | xargs

diff

2011-10-23T16:03:00.001-07:00


diff from_file to_file
diff from_dir to_dir

diff useful lags
-B (Ignore changes whose lines are all blank.)
-b (Ignore changes in the amount of white space)
-y (side by side ouput comparison)

useful alias:
diff -Bb alias

Changing Linux Login Shell

2011-10-22T14:38:00.000-07:00


Ways to change Linux shell
1. chsh (change login shell)
2. edit /etc/password
3. exec in .login file

how to delete file which name start with minus sign?

2011-10-21T07:50:00.001-07:00

rm "./-filename"

Defiance movie

2011-10-16T18:50:00.000-07:00

My sister recommend the movie. She watched during her flight from Israel. Great movie.
Very sensitive. It remind my grandparents story about world word two. They had very difficult life and survived Nazi occupation of former Soviet Union. A lot of members of my parents dies during the war. My father uncle was killed in Latvia in 1944 as a soldier. My father grandfather was killed in Ghetto in 1943...
Most of the jewish familes have similar story to Bielski brothers'.

I purchased the movie in Amazon Instant Video. For more information about the movie, here is link on Wikipedia

Also, 15 years ago my grandmother Klara died. She was only 67 years old...

Yankees Stadium

2011-09-10T10:43:00.001-07:00

I went to Yankees game last Sunday. It was my first time in Yankees Stadium (new stadium). Roma invited me to the game with two of his coworkers (Eva from Germany) and Japanesse girl. Yankees won the game against Toronto (9-3).
The games was kind of boring... but stadium is great. Overall it was good experience and I like it. Here are some pictures from the game.

Database Optimization

2011-09-02T10:09:00.001-07:00

Indexing can dramarically improve performance of MySQL database. Indexing is the most important tool for speeding up your queries.

Facts, Tips & Terms:
- Database is a set of tables. Table is a set of rows and columns
- Full Table scan (slow) - examine each row in the table
- Data rows kept in a data file and index values are kept in a index file
- MySQL indexes speed up searches for rows matching terms of a WHERE clause. It also improve performance of MIN(), MAX()
and ORDER By operations.
- Index columns that you search for, not columns you select
- Declare columns to be NOT NULL - fater processing and less storage.
- Disadvantages of Indexing
a). Slow inserts, deletes and updates (need to update data and index files)
b). Index file takes up the disk space

- How to choose indexes:
b). Use short indexes (int is better than varchar). A smaller index involves less disk I/O, so it can be compared more quickly.
a). Index should be uniue (spread of values in a column). So index work best for columns with unique values.
c). Indexes are used for
<, >, <=, =>, =

Irene (hurricane)

2011-08-31T11:52:00.000-07:00

New York was hut by hurricane Irene last weekend. My apartment located in Zone A (mandatory evacuation).. I did not evacuate.
Public transportation was shutdown for the weekend first time.

New York was hit by hurricane last week. My apartment was located in Zone A (mandatory evacuation). I did not evacuate ... The building was not flooded. Here some picture of flooding Sheepsheadbay/Manhattan Beach area. Mayor Mike Bloomberg shut down public transportation.

drush

2011-08-31T11:46:00.000-07:00

Helpful Drush Commands:

drush fra - feature # Revert all

drush fu $module # update the code

drush dis $module # disable module

drush en $module # enable module

drush cc menu # clear cache for menu

drush cc all # clear all cache

drush sm # show modules The official full name of the command is pm-list which is confusing so just ignore it

drush scr test.php # running a Drupal script

drush php-script test.php # run a Drupal Script

drush php-eval 'global $user; print_r($user)' # executing code

SSH Login Without Password

2011-08-23T07:10:00.000-07:00

Server A (Local Server)
Server B (Remote Server)

Server A:
1. ssh-keygen -t rsa // generate a key using ssh-keygen
2. scp id_rsa.pub myname@SERVERB:/home/myname/

SERVER B:
1. ssh-keygen -t rsa
2. cp id_rsa.pub .ssh/authorized_keys2
3. chmod 700 ../.ssh
4. chmod 640 .ssh/authorized_keys2

Troubleshooting MySQL Slow Queries with Tcpdumps

2011-08-23T06:49:00.000-07:00

Great article by Sean Hull - Troubleshooting MySQL Slow Queries with Tcpdumps

VIM (tutorial 1)

2011-08-22T14:35:00.000-07:00

I - insert at the begin of line
A - append to end of line
o/O - open a new line after/before the current
v/V - Visual mode to select text
Shift+R - replace text
C - change remaining part of line
r - replace one character
~ - changes case
J - joins lines
Ctrl+A - increment a number
Ctrl+B - decrement a number
. - repeat last command (a simple macro)
= indent line

Akamai

2011-08-18T14:30:00.000-07:00

Interesting article on Akamai infrastructure
Click here

Git on RHEL/CENTOS

2011-08-11T09:15:00.001-07:00

Git is not available in RHEL repository. Use the following commands to install it.

rpm -ivh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

yum install git

wget utlity on MAC

2011-08-10T09:20:00.000-07:00

By default wget utility is not included in MAC. So I decided to install it through 'port'

sudo port install wget
---> Computing dependencies for wget
---> Fetching archive for wget
---> Fetching wget
---> Attempting to fetch wget-1.12.tar.gz from ftp://ftp.gnu.org/gnu/wget
---> Verifying checksum(s) for wget
---> Extracting wget
---> Applying patches to wget
---> Configuring wget
---> Building wget
---> Staging wget into destroot
---> Installing wget @1.12_3+ssl
---> Activating wget @1.12_3+ssl
To customize wget, you can copy wgetrc.sample to wgetrc
in /opt/local/etc and then make changes.
---> Cleaning wget

Skirt Steak

2011-08-10T07:13:00.000-07:00

I made barbecure at "Ford Street balcony" (aka my apartment). I inivted few friends and relatives to my place. We decided to make skirt steak.
It is really good choice for barbecue because:

delicious

healthy

fast

Skirt Steak price is about $10 per lb. For more information read on wikipedia
here

Old Craton Aqueduct & Groton Gorge Park (hiking)

2011-08-10T06:57:00.000-07:00

I hiked Old Craton Aqueduct path from Ossining Train Station to New Craton Dam that is located in Groton Gorge Park.
It was my third time exploring this area, few years back went with Ignat. I really enjoyed the hike before. So on 8/6/2011 I decided to explore the area again in my first date with Alina.

We drove from NYC to Ossining Station and park there. August is not great idea for hiking but it was not so hot. We hiked for about 15 miles both ways and enjoyed the hike.

Tesla motors

2011-08-02T20:27:00.000-07:00

There is "Tesla Motors" store on West 25th street between 9th & 10th street. The store is located on my way from subway station to work. I am very interested in electrical cars and see huge future in them. It is good for environment, country, people and etc.
I would consider to buy one of the cars in near future.

See some pictures that I took from my iPhone 4.

Victor's Birthday

2011-08-02T06:37:00.001-07:00

Sunday July 31, 2011 after soccer game in Garritsen beach we meet at Victor's house to celebrate his 45th birthday... There were 6 people in the birthday celebration. I had good time and have a chance to know some people better.

One show that I like to watch is House MD. Accidently I find out that Lisa Edelstein that plays Cuddy on the show is related to Lesha. Small world.

The Starett-Lehigh Building

2011-08-02T06:17:00.000-07:00

The Starett-Lehigh Building located at 601 West 26th Street, New York New York 10001.
Martha Stewart Living Omnemedia office located here. The building is huge and has very interesting history.
For more information click here

Linux CPU load (top)

2011-07-26T14:56:00.000-07:00

Here is interesting article about Linux CPU load Click Here

MultiCore vs MultiProcessor vs. HyperThreaded

2011-07-26T14:52:00.001-07:00

For more Information

Core in my system

2011-07-26T14:45:00.000-07:00

grep 'model name' /proc/cpuinfo | wc -l

OR

grep -c 'model name' /proc/cpuinfo

Air Conditioners

2011-07-24T19:18:00.000-07:00

Bought and Installed 2 LG (8,000 BTU) air conditioners on second floor.
Past few days were very hot (more than 100 degrees).

Cold Air is heavier than hot air. Therefore, cold air moves down and hot air moves up. Second floor of my apartment is like a sauna.

Horrible Boses (movie)

2011-07-24T19:09:00.001-07:00

I just watched "Horrible Boses" movie in Sheapsheadbay theather with Marina. B+ movie.

Recycling (2833 Ford Street)

2011-07-22T11:00:00.000-07:00

David and I setup recycling area.

Audible

2011-07-14T11:53:00.000-07:00

just open audible.com account...

Cycling (iPhone pics)

2011-07-08T15:13:00.001-07:00

Job change

2011-07-08T15:09:00.000-07:00

I accepted offer from MarthaStewart... I gave my current employer almost 3 weeks notice. Going to work in the NYC. Ready to hit ground with new employeer.

Outliers (Malcom Gladwell)

2011-06-27T11:03:00.000-07:00

It is good book that is full with interesting facts and good thinking. The most interesting book for 2011.

Plum beach Brooklyn

2011-06-14T10:42:00.000-07:00

I went to Plum beach few times in past two weeks. It is beautiful area. Here are some pictures:

Bicycle with dad and nephew

2011-06-04T09:22:00.000-07:00

We were not able to complete 23 miles trip to Howard Beach, Far Rockaway last week because of 2 flat tires...
Today we did it! Nice whether today. See below some of the pictures.

Bicycle trip with my nephew

2011-05-30T17:17:00.000-07:00

I forgot to post on the blog. Started new bicycle season with my nephew. Here is pictures of him.
He is getting taller, smarter and mature.

Bicycle Tire

2011-05-30T15:37:00.000-07:00

I update tires on my Caad 9 5 bike today. New tires are http://hawleysbicycleworld.com/product/continental-grand-prix-4-season-700x25-black-duraskin-fold-sku-tr9404-qc59.htm

The tire size is 700mm x 25mm (previos were 23 mm).

Little Chinese Seamstress

2011-05-19T13:50:00.000-07:00

I have not read book for few months now. Last week read "Little Chinese Seamstress" by Dai Sijie.

The picture was taken on Marble Hill station (Bronx, NY) around 8:30AM. iPhone 4

Hammock Beach Resort

2011-04-24T12:04:00.000-07:00

It was good vacation in Hammock Beach Resort in Palm Beach, Florida.

fdupes

2011-03-30T12:45:00.000-07:00

useful utlity that search for duplicate files base on MD5 -
fdupes

OK (meaning)

2011-02-23T06:20:00.001-08:00

OLL Korrekt - OK

Uncle Leo of Seinfeld dies

2011-02-17T09:42:00.000-08:00

Just read an article that Uncle Leo of "Seinfeld" died...
Here is the article

Bluegrass

2011-02-16T09:18:00.000-08:00

Listening to Bluegrass music at work... Country music that was originated in 1940s.

For more information - link

Sick

2011-02-07T09:20:00.000-08:00

I got sick today. At home resting.
Brutal New York - 1965/95
NY 1965

Winter in NY

2011-02-01T09:37:00.000-08:00

Every week snow storms in NY. I see such winter first time in USA. See some pictures that I took on Marble Hill Metro North Station.

Felix - 12 years (random pics)

2011-01-26T13:03:00.000-08:00

Here are some pictures of my nephew that I took last Saturday...

Winter Storm

2011-01-21T05:49:00.000-08:00

3rd winter storm. See below pictures from my living room. It is beautiful outside and I love snow :)

PostgreSQL

2010-12-27T18:24:00.000-08:00

I have used MySQL for last 8 years. It is good database but still lucks few functionalities. Oracle bought Sun and it is not clear future of MySQL..

Alex Leo excellent lecture on PostgreSQL.. Including good explaination on partition, replication, sharding, indexing...

Семинар «PostgreSQL в высконагруженных проектах». Часть 1 from Alex Leo on Vimeo.

Семинар «PostgreSQL в высконагруженных проектах». Часть 2 from Alex Leo on Vimeo.

Being an early or later riser

2010-11-24T15:43:00.000-08:00

watch out

crack of down - very early hour

up at the crack of down

stoop - area outside front doors

ungodly hour - very early in the morning, too early

turn over a new leaf - new phase to begin

be in habit of something

stay up - to be awake all night

sleep-deprived very tired

deprive - withholding something

to make the switch

night owl - awake very late at night

early riser -person that gets up early

a change man

commendable - admirable

the early bird gets the warm

Jury Duty

2010-11-11T10:30:00.000-08:00

Last Thursday 11/4/2010 went to Brooklyn court for jury duty. Got dismissed and waiver for 8 years :)

Nudge

2010-10-29T18:11:00.000-07:00

How to Win Friends and Influence People

2010-10-29T14:40:00.000-07:00

I read the book. The book full of good life advices.

Start Service on Ubuntu - "sysv-rc-conf'

2010-10-21T10:45:00.000-07:00

sysv-rc-conf

The Last Jew

2010-10-17T13:45:00.001-07:00

Place on hold the book in Brooklyn Public Library. I finished reading the book. The book is about inquisition and jews in Spain.
After reading the book, I got better understanding of jewish life in Spain in 14th century.

purveyor

2010-10-09T08:10:00.000-07:00

1. One that furnishes provisions, especially food.
2. One that promulgates something: a purveyor of lies.

Antagonist

2010-10-09T08:08:00.000-07:00

Antogonist - An antagonist (from Greek ἀνταγωνιστής - antagonistes, "opponent, competitor, rival"[1]) is a character, group of characters, or an institution, that represents the opposition against which the protagonist must contend. In other words, 'A person, or a group of people who oppose the main character, or the main characters.'[2] In the classic style of story where in the action consists of a hero fighting a villain, the two can be regarded as protagonist and antagonist, respectively.[3] The antagonist may also represent a major threat or obstacle to the main character by their very existence, without necessarily actively targeting him or her.

Kitchen Confidential

2010-10-09T08:05:00.000-07:00

The book about chefs, kitchens and restaurant business. I read this book on train.

Voice Mail greeting

2010-10-05T13:09:00.000-07:00

I realized that voicemail greeting on IPhone was not set... Here is my new greeting

"This is (name). I'm currently unable to take your call. Please leave your name, phone number, and a brief message, and I will contact you as soon as possible. Thanks."

SELF JOIN to delete from the same table

2010-10-03T17:44:00.000-07:00

DELETE o FROM users u, uc_orders AS o JOIN uc_orders AS o1 ON o.order_id = o1.order_id
WHERE o1.uid = u.uid AND (u.mail like 'test%);

Posture

2010-09-29T11:53:00.000-07:00

I would like to start fixing my posture. Plan?

CAAD9-5

2010-09-20T11:35:00.001-07:00

I picked up CAAD9-5 bicycle from local bicycle store Roy's Sheepshead Cycle and went for 35 miles ride. The bike is much better compare to my previous and I'm very excited with my purchase.
Some images below:

Drinking the Kool-Aid

2010-09-20T11:33:00.000-07:00

Today at work I heard the expression "Drinking the Kool-Aid". The meaning of it:

"Drinking the Kool-Aid" means becoming a firm believer in something: accepting an argument or philosophy wholeheartedly or blindly. The term originated with the Jonestown Massacre,[1][2][3] where members of the Peoples Temple were said to have committed suicide by drinking Kool-Aid laced with cyanide.

Bicyle trips to Far Rockaway

2010-09-12T15:27:00.000-07:00

Saturday and Sunday morning ride bicycle to Far Rockaway, Jamaica Bay, Howard Beach and back. 7 bridges total

mysql to CSV file

2010-09-02T12:33:00.000-07:00


SELECT * INTO OUTFILE 'result.csv'
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n'
FROM my_table;

Middlesex

2010-08-07T20:36:00.001-07:00

Middlesex
Jeffrey Eugenides

Being logical : a guide to good thinking

2010-08-07T20:34:00.000-07:00

AUTHOR: McInerny, Dennis Q.
Being logical : a guide to good thinking

Life without lawyers

2010-08-07T20:33:00.000-07:00

AUTHOR: Howard, Philip K.
Life without lawyers : liberating A

nepotism

2010-07-01T19:52:00.000-07:00

nepotism |ˈnepəˌtizəm|
noun
the practice among those with power or influence of favoring relatives or friends, esp. by giving them jobs.
DERIVATIVES
nepotist noun
nepotistic |ˌnepəˈtistik| adjective
ORIGIN mid 17th cent.: from French népotisme, from Italian nepotismo, from nipote ‘nephew’ (with reference to privileges bestowed on the “nephews” of popes, who were in many cases their illegitimate sons).

Disk Usage for Directory (Linux)

2010-06-25T13:20:00.000-07:00

du -ch | grep total

List of Freely Available Books

2010-06-19T12:40:00.001-07:00

http://stackoverflow.com/questions/194812/list-of-freely-available-programming-books

Set Default web browser for Mac OS X

2010-06-10T12:52:00.001-07:00

Steps needed to change default browser:

Start Safari

Preferences

General Tab

Choose Default Web Browser

Close the preferences window.

Quit Frozen Application on Mac

2010-06-10T12:21:00.000-07:00

ps -A | grep {application}
kill -9 {process-id}

How to Kill a Mac OS X Application That Just Won’t Quit

Happiness by Matthieu Ricard

2010-05-22T05:59:00.000-07:00

I read the book twice. Mr. Ricard gives advice how to be happy. The book is the introduction to Buddhist.

City of Thieves

2010-05-16T06:41:00.000-07:00

City of Thieves by David Benioff is about World War II: siege of Leningrad, Nazi and jews and more.

hermit

2010-04-25T09:04:00.001-07:00

hermit - a person who has withdrawn to a solitary place for a life of religious seclusion.

benign

2010-04-25T08:26:00.001-07:00

benign - being kind

The Black Swan by Nassim Nicholas Taleb

2010-04-20T06:25:00.001-07:00

This book is about randomness and uncertainty. Read it twice. Excellent book.
Link

Eating Animals by Safran Foer

2010-04-19T15:58:00.000-07:00

Factory farming is main focus of the book. It's about how factory farming money machine "produce" animals. Safran Foer tell us why factory farming must be stop.

Btw: Interesting fact that Hitler was vegetarian.

Eating Animals link on amazon

Cohort

2010-04-02T14:30:00.000-07:00

Cohort
In statistics and demography, a cohort is a group of subjects who have shared a particular experience during a particular time span[1] (e.g., people born in 1950; Irish women born in 1970; truck drivers who smoked between age 30 and 40). Cohorts may be tracked over extended periods of time in a cohort study. The cohort can be modified by censoring, i.e. excluding certain individuals from statistical calculations relating to time periods (e.g. after death) when their data would contaminate the conclusions

cohort

Ruby Notes

2010-03-22T08:33:00.001-07:00


[Output]
"puts" writes to the screen with a carriage return at the end
"print" does the same thing without the carriage return

[Reading from the Console]
$name = STRDIN.gets

[Functions]
def welcome(name)
    puts "hi #{name}" # "#{}" evaluate the variable
end

[Call Functions]
welcome("Mike") or welcome "Mike"

Extra arguments are gathered into the last variable if preceded with a "*"
def test(a=1,b=2,*c)

[Variable]
- Global variables start with '$'
- Class variables start with '@@'
- Instance variable start with '@'
- Local variables, method names, and method parameters start with lower case letter
- Class names, module names and constants start with uppercase letter
- Variable are composed of letters, numbers and underscrores
- Method Names may end with:
'?' - imply a boolean operation
'!' - imply something dangareous, like strings being modified
- __END__ on its own line with no white space, are ignored
-  Lines between =begin and =end are ignored

[Collections]
- mystuff = %w{tivo nokia ipaq}  # make a string array
- select # populates a new array with members which meet a criteria

[Loops]
for i in 1..4

[Regular Expressions]
-  /a/ =~  # find first "a" and return position
-  %r{a} =~  # same thing as above
-  /p.r/ =~ # matches any character

[Blocks]
Blocks are nameless chunks of code that may be passed as an argument to a function.
def whereisit
        yield
end
whereisit {puts "where is the money?" } 

where is the money?

- each # iterated through each item of a collection
- detect # returns the first item matching a logical expression
- select # returns all items matching a logical expression
- collect # returns an array created by doing the operation on each element
- inject # is the reducer function in Ruby. "inject" loops over an enumerable and performs an operation on each object and returns a single value

[File I/O]
- Read File into a string:
file = File.new("myfile.txt")
mytext = file.read

- Read an entire file into an array of lines
lines = IO.readlines("data.txt")

- Read a file line by line
file = File.open("file.txt")
while line = file.gets
 puts line
end
ensure
 file.close # ensure that file is close
end

OR
IO.foreach("data.txt") { |line| puts line }

- Read only a few bytes at at time
require 'readbytes'
file = File.new("myfile.txt")
while bytes = file.readbytes(80)
 print bytes+"\r\n"
end
file.close

Dead Horse Bay

2010-03-20T14:25:00.000-07:00

Today is beautiful whether. First hiking trip of 2010 was to Far Rockaway with the stop in Dead Horse Bay

Billy Elliot (Broadway)

2010-03-19T17:25:00.000-07:00

I saw Billy Elliot Broadway Show yesterday.

The shows include politics, music and dancing. Good show. Recommend

Ruby: Classes vs. Module

2010-03-19T10:03:00.000-07:00

"Ruby Modules are similar to classes in that they hold a collection of methods, constants, and other module and class definitions. Modules are defined much like classes are, but the module keyword is used in place of the class keyword. Unlike classes, you cannot create objects based on modules nor can you subclass them; instead, you specify that you want the functionality of a particular module to be added to the functionality of a class, or of a specific object. Modules stand alone; there is no "module hierarchy" of inheritance. Modules is a good place to collect all your constants in a central location."

Require
require and load take strings as their arguments
[require "sinatra"]
[load "bicycle.rb"]

Include
accpet any number of Module objects
[include Enumerable, Comparable]

Every class ia a module, the include method does not allow a class to be included within another class.

Can mix in more than one module in a class. However, a class cannot inherit from more than one class.
Class names tend to be nouns, while module names are often adjectives.

Source #1
Source #2

bg, fg, ^Z, ^C

2010-03-17T13:52:00.000-07:00

CTRL+Z (or ^Z) - suspend or stopped. To list of jobs and their state by running jobs -l.
CTRL+C (or ^C) - kill the process

bg - background
fg - foreground
jobs -l => lists jobs in background

+ flag on the output of jobs -l indicates the current job and the - flag indicates the previous job.
The %% and %+ names refer to the current job while %- refers to the previous job.

More Info: More Jobs

vim remove duplicate lines

2010-03-16T12:29:00.000-07:00

g/^$.*$$\n\1/d

TR (bash)

2010-03-16T12:27:00.000-07:00

Can use tr to remove all carriage returns and Ctrl-z ( ^Z ) characters from a Windows file by entering:

tr -d '\15\32' < winfile.txt > unixfile.txt

Note: cannot use tr to convert a document from Unix format to Windows

sort and remove duplicates in file

2010-03-11T14:02:00.000-08:00

sort and uniq will quickly and easily remove duplicates, lsit only the dupilcates or only the unique data.

sort myfile.txt | uniq

Metaphone or Double Metaphone

2010-03-10T14:21:00.000-08:00

Methaphone / Double Metaphone is an algorithm to match words that are spelled differently, but sound the same. Its useful for avoiding duplicated names in a database.

VIM helpful commands

2010-03-10T13:41:00.000-08:00

:sort u (remove duplicate line)
:g/pattern/d (delete line)
:g/^$/d (delete blank lines)
:%s/.*/\U&/ (UPPER CASE)
:%s/.*/\L&/ (LOWER CASE)

same origin policy

2010-03-05T12:01:00.000-08:00

Aa web page served from domain1.com CANNOT normally connect to or communicate with a server other than domain1.com

POST

2010-03-05T11:56:00.001-08:00

POST is safer than GET

No restrictions in size

No Format restrictions. Binary data is also allowed.

The browser ussually alerts the user that data need to be resubmitted.

multipart/form-data or application/x-www-form-urlencoded