j-manu

Delete large number of files:
 ls|xargs -L 1000 rm

--

Maintenace page for Rails

RewriteEngine on

RewriteCond %{DOCUMENT_ROOT}/../tmp/stop.txt -f

j-manu

When doing the post-install setup of postgresql default database using initdb, you may hit this error:

FATAL:  could not create shared memory segment: Cannot allocate memory
DETAIL:  Failed system call was shmget(key=1, size=1646592, 03600).
You can either change the postgresql configuration to use less shared memory, or increase the system setting.

I suggest the latter, because this problem seems to stem from other running apps using some of the shared memory allowance, and I'd be nervous about them running out anyway if postgresql was still using a decent amount. IMHO, the default OS X limit is way too low.

Easy to fix; run:
sudo sysctl -w kern.sysv.shmall=65536

j-manu

# extract only the filename without extension

for i in *.xhtml
do 
 filename=$(basename $i}); 
 extension=${filename##*.};
 filename=${filename%.*}; 
 wkhtmltopdf -O landscape -s A3 $i $filename'.pdf'; 
done

j-manu

If Vim detects that a file has been changed outside Vim and not inside Vim, 'autoread' will make Vim reread it automatically. But that auto-read won't happen if you do nothing. Vim checks timestamps after invoking the shell, and when you issue the ":checktime" command. Even if you add

  :au CursorHold,CursorHoldI * checktime

the check will be triggered *once* if you wait for 'updatetime' milliseconds without doing anything, then it won't be retriggered until you hit a key.

You could also use

  :map <F7> :checktime<CR>
  :map! <F7> <C-O>:checktime<CR>

j-manu

class CreateList < ActiveRecord::Migration
  def self.up
   create_table :lists do |t|
     t.column :name, :string
     t.column :link, :text
     t.column :position, :integer
   end
  end

  def self.down

j-manu

class List < ActiveRecord::Base
  acts_as_list :order => :position
  validates_presence_of :name, :link
  validates_numericality_of :position, :only_integer => true , :allow_nil => false

  protected
  def validate
    if position < 1
      errors.add(:position , " must be greater than 0")
    end

j-manu

def update
 @list = List.find(params[:id])
 if(@list.position > params[:list][:position].to_i)
   List.find(:all, :conditions => ["position >= ? AND position < ?", params[:list][:position],@list.position]).each {|c| c.update_attribute(:position, c.position + 1)}
 else
   List.find(:all, :conditions => ["position <= ? AND position > ?", params[:list][:position],@list.position]).each {|c| c.update_attribute(:position, c.position - 1)}
endif
@list.update_attributes(params[:list])
redirect_to :action => 'list'
else

j-manu

<%= javascript_include_tag 'prototype.js' %>
<%= javascript_include_tag 'effects.js' %>
<%= javascript_include_tag 'dragdrop.js' %>


#reorder.rhmtl (Drag and Drop reordering via AJAX)

<div id="lists">
  <ul id="sortable_list">
  <% @lists.each do |list| %>

j-manu

#sortable_list {margin:0;margin-top:10px;padding:0;list-style-type: none;width:250px;}
#sortable_list li {margin:0;margin-bottom:4px;padding:5px;border:1px solid #888;cursor:move;}

j-manu

#!/usr/local/bin/ruby
require 'rubygems'
require 'cgi'
require 'mechanize'

def check_pnr(pnr1,pnr2)
  agent = WWW::Mechanize.new
  page = agent.get 'http://www.indianrail.gov.in/pnr_stat.html'
  form = page.forms[0]
  form.lccp_pnrno1 = pnr1