Rename all the files in the folder with increasing numbers

Question

I have a folder and inside that folder I have 10-15 files with arbitrary names. The filenames may include spaces in them. For example: wWw.page.com __ (576)_002. In a terminal, when I press w and then tab the file name appears like this: wWw.page.com\ \ __\ \(576\)_0.txt.

I want some script that will rename all my files like this 0.txt, 1.txt, 2.txt and so on.

My problem is: wWw.page.com __ (576)_002.txt file not found.

index=0;
for i in $(ls *.txt)
do
    cp "${i}"  $index".txt" 
done

Answer 1

Instead of ls try to glob:

index=0;
for name in *.txt
do
    cp "${name}" "${index}.txt"
    index=$((index+1))
done