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# if you want to install gems locally , without having to use sudo
uhc:blazer-dev zatef$ bundle install --path vendor/bundle


# when push rails app to a brand new ubuntu machine, I came across multiple bugs and had to fix them with the below:

# even though we have 2.3, we still need the dev version. 
sudo apt-get install ruby2.3-dev
sudo apt-get install build-essential

codepedia

[root@dev-instance ~]# adduser zee
[root@dev-instance ~]# su - zee
[sudo] password for zee: 
[root@dev-instance ~]# passwd zee
Changing password for user zee.
New password: 
Retype new password: 
passwd: all authentication tokens updated successfully.
[root@dev-instance ~]# vim /etc/passwd

codepedia

# find the diff between two tables. 
(   SELECT * FROM table1
    EXCEPT
    SELECT * FROM table2)  
UNION ALL
(   SELECT * FROM table2
    EXCEPT
    SELECT * FROM table1) 
=====

codepedia

:%s/<Ctrl-V><Ctrl-M>//g


find spaces before end of line and remove it ..anything before this "$"
:%s/\s\+$//g


#ctrlP plugin
:h ctrlp-mapping
#repeat a char

codepedia

<script type="text/javascript">            
    var submitted = false;
    function submit(){
        if(submitted) {
            alert('Obrigado por cadastrar seu e-mail!'); 
            document.getElementById('entry_0').value = '';
        }
</script>
<iframe name="hidden_iframe" id="hidden_iframe" style="display: none;" onload="submit();"></iframe>

codepedia

//Your dynamic content
var catImage = "http://n-z.tv/wp-content/uploads/2017/08/cat-1024x683.jpg";
var message = "Hey this is some dynamic content";
var title = "Some Dynamic Content"

//Create the string and insert it into the body (or the "template" for you)
document.body.innerHTML = `
<div>
  <h3>${title}</h3>
  <img src="${catImage}"/>

codepedia

$ cat $_
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).

codepedia

byte[] IFD_Address_tmp = Arrays.copyOfRange(bytes, 4, 8); 
int IFD_Address = 0;
int i = 0;
int shiftBy = 0;
for (shiftBy = 0; shiftBy < 32; shiftBy += 8) {
    IFD_Address |= ((long) (IFD_Address_tmp[i] & 0xff)) << shiftBy;
    i++;
}