Distinguishing lower case from upper case. In a case sensitive language, "abc" is considered different data than "ABC." Windows is not case sensitive, thus, "Abc" is the same as "aBc." However, the Linux/Unix world is case sensitive, and commands are typically named with lower case letters (gzip, compress, pack, etc.). In a great deal of technical Linux/Unix documentation, commands are written in lower case, even when the words are titles and paragraph headers. This is done to reflect their true names and the way they have to be entered on a command line in order to be executed.
URLs on the Web
It is easy to tell if the Web server you are accessing is Linux/Unix or Windows. Try changing the case of some of the letters in the directory or file name in a URL (not the domain name). If the page is retrieved, it is a Windows server. If not, it is a Linux or Unix server.
Windows Maintains Your Case
Although Windows is not case sensitive, it maintains the case of your file and folder names for visual identification. However, the case does not matter when you try to find a file or run a program. For example, you can name your file "MyBudget.doc," and find it with "mybudget.doc."
Programs Often Convert Case
In order to compare data properly, in applications of all kinds on all platforms, it is common to convert user input and data from the database to the same case before the comparison is performed. It does not matter to which case the letters are converted as long as they are the same case.
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