Vidul Nikolaev Petrov » scripts

Delete Trac Tables

Vidul — Thu, 27 Aug 2009 15:55:00 +0000

for i in `sqlite3 trac.db '.tables'`; do sqlite3 trac.db "delete from $i"; done

Generate HTML with Javascript

Vidul — Thu, 30 Jul 2009 02:57:00 +0000

sample HTML file

< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

sample JavaScript file (should be named gen.html.js)

$("#container").css({margin:"5% auto 5% auto",width:"70%",'max-width':"70%"});
$("#container").append("this is the header
");
$("#container").append("this is the body
");
$("#container").append("this is the footer
");
 
$("#header").css({width:"100%",height:"33px",'padding-top':"10px",'text-align':"center",border:"1px solid #777",background:"#ddd"});
$("#header").after("&&
");
$("#body").css({width:"100%",height:"50%",'madrgin-top':"2%",border:"1px solid #777",background:"#eee"});
$("#body").after(" 
");
$("#footer").css({width:"100%",height:"33px",'padding-top':"10px",'text-align':"center",border:"1px solid #777",background:"#ddd"});
 
$("#body").append("1. sub body
");
$("#body").append("2. sub body
");
$("#body p:first").css("text-decoration", "underline");
$("#body p:last").css("text-decoration", "overline");

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

a quick remedy for ipod shuffle illnesses

Vidul — Thu, 19 Mar 2009 02:02:00 +0000

Symptoms: one green light flash, followed by two green ones.

Conclusion: the player is dead.

Remedy: download ipod reset utility, reset the player and

# change _path_to_the_device_ with the real path (see `dmesg|tail`)
 
mount /dev/_path_to_the_device_  /mnt && cd /mnt
 
# download rebuild_db.py from http://shuffle-db.sourceforge.net/
# copy 'rebuild_db.py' in /mnt and create the dirs' structure
 
python -c '
import os
os.makedirs("iPod_Control/iTunes")
os.makedirs("Music")
'
 
cd /mnt && cp ~/Music/*.mp3 Music
python rebuild_db.py
cd .. && umount

That’s it.

P.S. you can format an ipod device as many times as you like,
just follow the above procedure to reset it.

How to download an image from flickr

Vidul — Wed, 11 Mar 2009 21:10:00 +0000

I wasn’t able to download a photo from flickr. It happened to be 1px transparent image over the other. Here is a simple scaper in cases of such “protection”:

require 'rubygems'
require 'www/mechanize'
 
url = 'http://www.flickr.com/photos/46457493@N00/3162339409/in/set-72157612102050814/'
 
my_id = url.split("/")[-3]
agent  = WWW::Mechanize.new
page   = agent.get(url)
 
url   = page.search("//div[@id='photoImgDiv#{my_id}']/img").attr('src')
 
agent.get(url).save_as((File.basename(url)).split("?")[0])

iptables – blocking incoming traffic

Vidul — Sat, 14 Feb 2009 16:28:00 +0000

This iptables config will block all incoming traffic, except from machines, identified by thier MAC addresses:

iptables -F INPUT

iptables -A INPUT -m mac—mac-source 00:3f:5f:ab:2c:7d -j ACCEPT

iptables -A INPUT -m mac—mac-source 00:1e:32:36:97:4a -j ACCEPT

iptables -A INPUT -m mac—mac-source 00:44:11:a5:1d:6d -j ACCEPT

# or by ip address:

#iptables -A INPUT -p tcp -s 1.1.1.1 -j ACCEPT

#iptables -A INPUT -p tcp -s 2.2.2.2 -j ACCEPT

#iptables -A INPUT -p tcp -s 3.3.3.3 -j ACCEPT

iptables -A INPUT -m state—state ESTABLISHED -j ACCEPT

iptables -A INPUT -s 127.0.0.1 -j ACCEPT

iptables -A INPUT -j REJECT

PS1 colors

Vidul — Sat, 14 Feb 2009 09:11:00 +0000

I like to see green prompt for userid > 0 and red for root, also the hostname and the history number of a command.

PS1="\[\e[32;1m\]\u\[\e[30;1m\]@\[\e[32;1m\]\H[\!]\W\[\e[30;1m\]\\$\[\e[0m\]"

PS1="\[\e[32;1m\]\u\[\e[30;1m\]@\[\e[32;1m\]\H[\!]\W\[\e[30;1m\]\\$\[\e[0m\]"

how to monitor ip addresses from a log file

Vidul — Thu, 29 Jan 2009 00:12:00 +0000

tail -f production.log  | egrep "([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}"

Ultra Tiny Address Book

Vidul — Wed, 29 Oct 2008 14:18:00 +0000

#!/usr/bin/perl
 
$s = shift;
$"  = "\n";
$/  = $\;
$_  = ;
@_ = /(.*?$s.*)/gi;
 
print "@_\n";
 
__DATA__
 
me "some address" my_phone_here
etc...
etc...

Quick Scanner (Host/Port)

Vidul — Sun, 28 Sep 2008 20:09:00 +0000

#!/usr/bin/ruby
 
host_port = ARGV[0]
host = host_port.split(':').first
port = host_port.split(':').last
 
puts %x[nmap -p #{port} #{host}]

Or just:

#!/usr/bin/ruby
 
puts %x[nmap -p #{ARGV[0].split(':').reverse.join(' ')}]

Usage (cli and given that the script is named scan_proxy):

./scan_proxy 202.105.182.87:808