You need to create a file with just lower or uppercase
With vim you can do almost everything but sometimes you need to search a bit around.
To convert a whole text to lowercase you can use:
For converting to uppercase you use:
Hope this helped you.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.