Remove prepended 4-digits numbers from filenames.

denumerate-files.sh

#!/bin/sh
#
# Denumerate all files

for weekday in [0-9]*
do
  cd "$weekday"
  for file in *
  do
    if [ "$file" == "url.txt" ]
    then
      echo Disregarding url.txt
      continue
    fi
    echo Renaming $file...
    old="$file"
    new=`echo "$file" | cut -b 4-`
    mv "$old" "$new"
  done
  cd ..
done