Rename a character in various filenames inside a subfolder of a folder

Question

I am a noob, I have accomplished various things on the cli, however I haven't been able to rename some files Let me explain with an example.

I have this:

folder/
    subfolder/
        fileto_rename.txt
folder2/
    subfolder2/
        fileto_rename2.txt

I want to rename to this:

folder/
    subfolder/
        filetorename.txt
folder2/
    subfolder2/
        filetorename2.txt

I just cant for the life of me understand the instructions on how to do it with find or rename, mv says I need to provide a destination... I hope someone could help me out. Sorry for my bad English

Answer 1

It should be as simple as:

rename -n 's/_//' folder/subfolder/*

Remove -n when satisfied with output to do the actual renaming.

's/_//' will delete all underscore characters in file names.

folder/subfolder/* is the path to your files and * works on all files in that path.