How to add date/time stamp to screenshot file in shell script?

thank you for a beautiful explanation both in content and in terms of the didactic format.

You really should write a Kindle book on KBM.

Unfortunately, the echo is correct but the term snapshot does not appear in the file listing neither in Finder nor in Pathfinder.

1- macro
2- echo is fine
3- both PF and Finder: only the date time stamp appears.

I tried to add an underscore between File_screenshot but it did not help

thank you !

image