PHP fatal error – call to undefined function mb_string
This error tells us that the mb_string library is not installed. mb_String is a library, which provides support for UTF-8 and UCS-2 characters. PHP uses ASCII by default which is…
Pushed changes to GIT but don’t see it in repository
Problem You pushed your changes to GIT but you don’t see it in the repository. Diagnosis First thing is to compare status with log will give you a list of…
Perl Quotes and Escape Sequences
Perl string literals are enclosed in quotation marks. You can use either single quotes (”) or double quotes (“”). Now suppose you need to print a string which contains a…
Linux split command
In Linux you can use split and join commands to split large files into smaller files or join many smaller files into a large file. This kind of operations are…
Copying a large database from one server to another
Recently, I had to copy a large database from one server to another. I had 100G free on the source server. Unfortunately, the server would run out of memory before…
The VirtualBox VM was created with a user that doesn’t match the current user running Vagrant
Error Message The VirtualBox VM was created with a user that doesn’t match the current user running Vagrant. VirtualBox requires that the same user be used to manage the VM…
ORA-01858: a non-numeric character was found where a numeric was expected
Error Message What it means This error occurs if a wrong value is passed when converting a number or string to date. Solution To fix this problem, find out what…
Finding duplicate values in a MySQL database
In the following query, we list all lastname held by 2 or more employees. If you want a value to be unique, you should add a unique constraint to the…
The VirtualBox VM was created with a user that doesn’t match the current user running Vagrant
Error Message Cause You copied someone vagrant box or your own from one machine to another. The box comes with its own settings that are specific to the user so…
Eclipse: change font size
To change the font size on eclipse temporarily, simply use ctrl++ and ctrl–. If you wish to change is permanently, do the following: select Window > Preferences choose General >…