Vidul Nikolaev Petrov » programming

Git Cheat Sheet (Debian based)

Vidul — Thu, 17 Dec 2009 17:20:36 +0000

apt-get remove --purge gitk gitosis git-gui git-core apt-get install mercurial

Projects’ Hosting

Vidul — Tue, 15 Dec 2009 23:18:02 +0000

Why Assembla free plan:

Subversion Hosting with Integrated Tickets
Trac and Subversion Hosting
Team Collaboration
Subversion Repository
Git with Integrated Tickets

P.S. If you are like me - spitting on GIT on a daily basis - Mercurial is included in the other plans.

How to sort a file by its columns

Vidul — Fri, 05 Jun 2009 02:29:00 +0000

# sort by user id
ruby -a -F: -ne 'puts $F.values_at(2, 0).join("\t")' '/etc/passwd' | sort -g
 
# sort by user home directory
ruby -a -F: -ne 'puts $F.values_at(5, 0).join("\t")' '/etc/passwd' | sort -g
 
# sort by username
ruby -a -F: -ne 'puts $F.values_at(0).join("\t")' '/etc/passwd' | sort -g

Getting Negative Number

Vidul — Tue, 28 Oct 2008 15:34:00 +0000

positive = 10.01
 
# the negative equivalent: -10.01
 
negative = positive - (positive * 2)
negative = positive * -1 # or
negative = positive / -1
negative = -positive # or 
negative = ---positive

Sorting an Array of Hashes with unknown keys

Vidul — Sun, 20 Jul 2008 04:46:00 +0000

AoH = [{"z"=>26}, {"g"=>7}, {"r"=>18}, {"a"=>1}, {"v"=>22}]
 
# sort by key
AoH.map{|e| e.to_a.flatten}.sort{|x,y| x[0] < => y[0]}
# sort by value
AoH.map{|e| e.to_a.flatten}.sort{|x,y| x[1] < => y[1]}

Enigma

Vidul — Wed, 09 Jul 2008 23:40:00 +0000

Here’s the mirror
Behind there is a screen
Turn around
On both ways you can get in
The experience of survival
Look around just people, can you hear their voice
Find the one who’ll guide you to the limits of your choice
The experience / of survival
Try to think about it …
That’s the chance to live your life and discover
Try to think about it
The experience of survival
The experience …
The experience of survival
The experience …

Google Chart API

Vidul — Mon, 30 Jun 2008 08:33:00 +0000

Charts for a map (in this example I’ve included Spain, France, Italy and Norway):

more about this API

Fun with String class methods

Vidul — Sat, 14 Jun 2008 14:45:00 +0000

class MyString < String
  # not really useful
  alias + concat
 
  # emulates Array '*' method
  def *(string)
    self.split('').inject('') do |s1,c|
      s1 + c + string
    end
  end
 
  # emulates Array '-' method
  def /(string)
    (self.split('') - string.split('')).to_s
  end
 
  # chars' delimiter
  def delimiter(string)
    self.*(string).sub /.$/, ''
  end
 
end
 
a = MyString.new("abcdef")
b = MyString.new("ABCDEF")
 
puts a * ':'
puts a / (b + "a")
puts a.delimiter(":")
 
#a:b:c:d:e:f:
#bcdef
#a:b:c:d:e:f

cheat sheets

Vidul — Fri, 30 May 2008 01:06:00 +0000

command-line cheat sheets

279 cheat sheets:

$cheat sheets

$cheat unix_text

One of Unix’s most useful features is its large number of text/data
manipulations programs. Some of the more propular include:

cat - concatenate and display files
cut - remove selected fields from each line of a file
sort - sort and collate lines
uniq - remove or report adjacent duplicate lines
awk - pattern scanning and processing language
sed - stream editor
tr - translate characters
diff - display line-by-line differences between pairs of text files
grep, egrep, fgrep - search a file for a string or regular expression
paste - join corresponding lines of several files, or subsequent lines of one
file
colrm - remove characters from specified columns within each line
expand, unexpand - expand TAB characters to SPACE characters, and vice versa

Geerd Wilders: Enough is enough

Vidul — Fri, 28 Mar 2008 21:06:00 +0000