remove-numbered-copies

#!/bin/bash

files=("$@")

if (( $# == 0 )); then
  files=(*)
fi

for file in "${files[@]}"; do
  if [[ ! -f $file ]]; then
    continue
  fi

  ext=${file##*.}
  base=${file%.*}
  #echo "checking $file ..."
  for ((i = 1; i < 10; ++i)); do
    candidate="$base($i).$ext"
    #echo "candidate: $candidate"
    if [[ -f $candidate ]] && cmp --silent "$file" "$candidate"; then
      echo "Removing $candidate (same as $file)."
      rm "$candidate" || echo >&2 "Cannot remove $candidate: $!"
    fi
  done
done