How to rename a batch file

Question

I want to rename a file from

Chat WhatsApp dengan A3 - 21.mp4
Mine.mp4
MoviMax_MV1_V016_2.106.001_20150227_2030_fbf.mp4
bedrock_server.mp4

to

test1.mp4
test2.mp4
test3.mp4
test4.mp4

How can I do it?

Answer 1

LC_COLLATE=C n=0 sh -c '
for i in ./*.mp4; do echo mv "$i" "test$((n+=1)).mp4"; done'

Remove echo if the printed actions are correct