>>/16/
I think I have an entirely different problem...
If there's a file named say 012345.jpg and if it's actually a .png file, renum.sh doesn't rename it to .png. If there's a file named 012345 renum.sh doesn't add the extension and instead if the command was renum --rand, it would become like 00004321.012345 so does this mean that I have to check all the file properties one by one then rename them to the proper extension accordingly because this script is not meant to rename file extensions to its proper file extension? (RIP me)
BTW, I'm using Archlinux, zsh, and rxvt-unicode.