dimitris kalamaras

mathematics, social network analysis, free software…

Category: Web development (Page 2 of 2)

Παιχνίδια, να περνάς την ώρα σου…

Πως σκοτώνεις την ώρα σου; Με παιχνίδια! 650+ παιχνίδια σε ένα WordPress. Και ανεβαίνουν κι άλλα! Τσεκάρετε http://www.paixnidia-paixnidia.gr/ και λειώστε…

Παιχνίδια !

Εκατοντάδες παιχνίδια για να σκοτώσεις την ώρα σου :)

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Drush most useful commands for Drupal admins

After years wasting time on drupal/sql backups, drupal restores, drupal updates etc, I started using the powerful drush command.

If you don’t know it “drush” is simply a (dru)pal (sh)ell written in PHP. It has been developed by core drupal developers to assist sysadmin and developers in everyday site management.

First, to install drush in a typical Debian/Ubuntu server, you need to install the PHP Extension and Application Repository (PEAR) which hosts drush. Simply type:

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How to replace a given string inside a mysql table?

Just use the fabulous command REPLACE provided by mysql. The syntax goes like this:

update database_table set table_column = replace (table_column, "oldstring", "newstring");

For instance, to replace all occurrences of “modules” inside the linuxformat.gr drupal db with “sites/all/modules” I typed in:

update linuxformat_system set filename = replace (filename, "modules", "sites/all/modules");


The first blog post is usually some general introduction about the writer. I don’t like those posts so I start by testing my MathML installation.

To test it, let me try to write the “sombrero” function:

z={sin(sqrt(x^2 + y^2))} / sqrt (x^2 + y^2)

which is automagically constructed by Ron Fredericks‘ WP Math Publisher plugin using this line of code:

[ pmath size=12]
z=sin (sqrt (x^2 + y^2)) / (sqrt (x^2 + y^2))[ /pmath]

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