Answer:
Unix filenames are case sensitive, meaning that upper case a lowercase are treated differently
Unix filenames don't require extensions like .txt or .doc to determine the file type or purpose
Step-by-step explanation:
Unix-like systems generally have case-sensitive filenames (readme.txt and Readme.txt data may be segregated in the same folder). Since the os was built like that.
The most advanced filename for Linux and UNIX is 255 character(255 bytes) limited. Most old UNIX software version restricts the filenames to only fourteen chars
In modern Unix and Linux filesystems, you can choose any character excluding null and / in a filename. ASCII symbols can be used. Several utilities use stops and commas in the filenames that they generate
Unix-like operating systems do not generally require extensions, they are often used even if extensions are not really required as they can allow users to assume the file type at a glimpse.