deleting every 10th file

```sh

#!/usr/bin/env bash
set -euo pipefail

# Directory containing save files (defaults to current directory)
DIR="${1:-.}"

# Set to 1 to actually delete files; otherwise, preview only
DELETE=0

mapfile -t files < <(
    find "$DIR" -maxdepth 1 -type f \
        -name 'ManualSave_*.sav' \
        -printf '%T@ %p\n' |
    sort -n |
    cut -d' ' -f2-
)

total=${#files[@]}

echo "Found $total save files."
echo "Keeping every 10th file, ordered oldest to newest."
echo

for ((i = 0; i < total; i++)); do
    if (( (i + 1) % 10 == 0 )); then
        echo "KEEP   ${files[i]}"
    else
        if (( DELETE )); then
            rm -- "${files[i]}"
            echo "DELETE ${files[i]}"
        else
            echo "WOULD DELETE ${files[i]}"
        fi
    fi
done

echo
if (( DELETE )); then
    echo "Done."
else
    echo "Dry run only. No files were deleted."
    echo "To enable deletion, change DELETE=0 to DELETE=1."
fi

```