DELETE de múltiples tablas con ORDER BY o LIMIT

Puede especificar múltiples tablas en un comando DELETE para borrar registros de una o más tablas dependiendo de una condición particular en múltiples tablas. Sin embargo, no puede usar ORDER BY o LIMIT en un DELETE de múltiples tablas.

Ref: http://dev.mysql.com/doc/refman/5.0/es/delete.html

png to ico online converter

ConvertICO is a Free Online Converter - fast (you don't need to register or to install software) and easy to use (you need only 3 clicks to convert the PNG or ICO file) - able to convert PNG to ICO (Windows Vista compatible icons) and ICO to PNG format files.

Ref: http://www.convertico.com/

Subversion vs. Git

When deciding on the best repository type for your team, there are a number of important factors. Subversion has become the de facto standard in our industry for the past several years, however, there is a new and very powerful version control system: Git.

Git is a distributed version control system, originally developed by Linus Torvalds for Linux kernel development. It has grown over the years to serve as the development platform for many other very large and active open source projects. While Git can be an excellent solution for many teams, it does have a slightly higher learning curve than its Subversion counterpart.

For a detailed explanation of the advantages of Git over Subversion, and vice versa, please see the following from the official Git Wiki: GitSvnComparison.

find para mover archivos antiguos

El sgte comando mueve los archivos (no directorios) de la carpeta en donde se encuentra (sin acceder a subdirectorios) accedidos hace más de 10mins a la carpeta "carpeta"

find . -maxdepth 1 -type f -amin +10 -exec mv '{}' carpeta/ \;

Interface Hall of Shame

Ref: http://homepage.mac.com/bradster/iarchitect/shame.htm

How to test an SMTP server using telnet

ref: http://www.anta.net/misc/telnet-troubleshooting/smtp.shtml

telnet: > telnet mx1.example.com smtp
telnet: Trying 192.0.2.2...
telnet: Connected to mx1.example.com.
telnet: Escape character is '^]'.
server: 220 mx1.example.com ESMTP server ready Tue, 20 Jan 2004 22:33:36 +0200
client: HELO client.example.com
server: 250 mx1.example.com
client: MAIL from: 
server: 250 Sender  Ok
client: RCPT to: 
server: 250 Recipient  Ok
client: DATA
server: 354 Ok Send data ending with .
client: From: sender@example.com
client: To: recipient@example.com
client: Subject: Test message
client:
client: This is a test message.
client: .
server: 250 Message received: 20040120203404.CCCC18555.mx1.example.com@client.example.com
client: QUIT
server: 221 mx1.example.com ESMTP server closing connection

Linux - Add a existing user to existing group

Add existing user tony to ftp supplementary/secondary group with usermod command using -a option ~ i.e. add the user to the supplemental group(s). Use only with -G option:
# usermod -a -G ftp tony

Change existing user tony primary group to www:
# usermod -g www tony