Demystifying Release Engineering - A Guide to Build Scripts

When it comes to software development, one of the key steps in making sure that your code transforms into a working application is the “build process.” Every software platform, be it Unix, Windows, or something else, offers its own way to script this process. You might have heard of Unix shell scripts, Windows batch files, or make files that serve as build scripts. These scripts are essentially a checklist that the computer follows to compile your code into an executable program.

A Simple Guide to Installing Both Firefox 4 and Firefox 3 on Ubuntu

Step 1: Add the Mozilla Daily PPA Repository#

First, open up your terminal window. Once it’s up, type in the command below to add the Ubuntu Mozilla Daily PPA repository to your system:

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa

You’ll be prompted to enter your password. Go ahead and do that, then hit Enter to confirm the addition of the repository.

Step 2: Update Your Package List#

After adding the repository, it’s crucial to update the package list to ensure you get the latest software. Type the following command:

Puppet Error – Could not file class in namespace – [solved]

How to Solve the Puppet Error: Could not find class in namespace#

Sometimes, when working with Puppet, you may encounter an error message that does not accurately reflect the actual problem. For example, if you see this error:

err: Could not retrieve catalogue: Could not find class php in namespaces standardbuild at /etc/puppet/manifests/templates.pp:15 on domain.internal.com

One of the possible causes could be a missing curly bracket in your code. This can be hard to spot and can waste a lot of your time. To avoid this, make sure you check your syntax carefully and use a code editor that can highlight any errors for you.

ERROR: phpize failed [solved]

How to install PHP development files

If you want to run phpize on your system, you need to install the development files of PHP first. Otherwise, you might get an error message like this:

sh: phpize: not found
ERROR: `phpize' failed

To install the PHP development files on Ubuntu/Debian, you can use the following command in the terminal:

apt-get install php5-dev

That should solve the problem. 🙂

How To Get The Current Epoch Time (Unix Timestamp)

  • PHP
  • PostgreSQL
  • powershell
  • Python
  • ruby
  • shell
  • sql server
  • unix
  • Unix Timestamp
  • vbscript

disableHLJS: false#

  • Perl:
time
  • PHP:
time()
  • Ruby:
Time.now # (or Time.new). To display the epoch: Time.now.to_i
  • Python:
import time # first, then int(time.time())
  • Java:
long epoch = System.currentTimeMillis()/1000;
  • Microsoft .NET C#:
epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
  • VBScript/ASP:
DateDiff("s", "01/01/1970 00:00:00", Now())
  • Erlang:
calendar:datetime_to_gregorian_seconds(calendar:now_to_universal_time( now()))-719528*24*3600. # OR element(1, now()) * 10000 + element(2, now()).
  • MySQL:
SELECT unix_timestamp(now())
  • PostgreSQL:
SELECT extract(epoch FROM now());
  • Oracle PL/SQL:
SELECT (SYSDATE - TO_DATE('01-01-1970 00:00:00', 'DD-MM-YYYY HH24:MI:SS')) * 24 * 60 * 60 FROM DUAL
  • SQL Server:
SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())
  • JavaScript:
Math.round(new Date().getTime()/1000.0) // getTime() returns time in milliseconds.
  • Unix/Linux Shell:
date +%s
  • PowerShell:
Get-Date -UFormat "%s" # Produces: 1279152364.63599
  • Actionscript:
(new Date()).time
  • Other OS’s Command line:
perl -e "print time" # (If Perl is installed on your system)
  • ColdFusion (CFML) MX 6.1+:
#int( getTickCount() / 1000 )#
  • Bash Command Line:
date +%s

Database Integration – some points to keep in mind

**Always Have a Single, Authoritative Source For Your Schema
** Everyone should know where the official schema resides, and have a frictionless experience in getting a fresh database setup. One should be able to walk up to a computer, get the latest from source control, build, and run a simple tool to setup the database (in many scenarios, the build process can even setup a database if none exists, so the process is one step shorter).

Perl – system load


To find the system load use the following perl snippet :

  1. System load of last one minute :
my $system_load = exec('<a class="zem_slink" title="Uptime" rel="wikipedia" href="http://en.wikipedia.org/wiki/Uptime">uptime</a> | awk -F "load average: " \'{ print $2 }\' | cut -d, -f1');
my $system_load = qx('uptime | awk -F "load average: " \'{ print $2 }\' | cut -d, -f1');
  1. System load of last 5 minutes :
my $system_load = exec('uptime | awk -F "load average: " \'{ print $2 }\' | cut -d, -f2');
my $system_load = qx('uptime | awk -F "load average: " \'{ print $2 }\' | cut -d, -f2');
  1. System load of last 15 minutes :
my $system_load = exec('uptime | awk -F "load average: " \'{ print $2 }\' | cut -d, -f3');
my $system_load = qx('uptime | awk -F "load average: " \'{ print $2 }\' | cut -d, -f3');