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The original context shows how to use $RANDOM to rename files to a random numerical value (e.g., 19889.mp4 ).
The user in the query was trying to move away from random naming towards using specific, pre-defined names in a loop. 19889mp4
If you are looking for help with a to rename files on your system, please tell me: What is the current pattern of the filenames? What is the desired pattern ? Are you using Linux, macOS, or Windows ? The original context shows how to use $RANDOM
The file is part of a demonstration on how to rename .mp4 files in Linux. 19889mp4