Is there any cli command to rename all content files to Y-m-d_slug.md ?
If not it is my suggestion to create.
That’s the job of utility commands like mv, which I suggest you use for that purpose. It has nothing to do with Hugo
that’s right. but also it would be usefull if hugo has.
making php script file for it 
if someone need this I’ve published gist.
copy this script to hugo content/posts folder and run php rename_files.php and you will get nicely named files with date prefix
.p.s. I still think hugo should have this functionality
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