Automated Cleanup of Old Files by Age

#!/bin/bash

# Usage: ./cleanup_old_files.sh /var/log/mywebapp 30
# Deletes files in specified directory older than N days.
# IMPORTANT: Use with caution!

TARGET_DIR="$1"
DAYS_OLD="$2"
DRY_RUN="${3:-true}" # Set to 'false' to actually delete files

if [ -z "$TARGET_DIR" ] || [ ! -d "$TARGET_DIR" ]; then
    echo "Error: Target directory not specified or does not exist."
    echo "Usage: $0 <target_directory> <days_old> [dry_run=true|false]"
    echo "Example (dry run): $0 /var/log/mywebapp 30 true"
    echo "Example (actual delete): $0 /var/log/mywebapp 7 false"
    exit 1
fi

if ! [[ "$DAYS_OLD" =~ ^[0-9]+$ ]]; then
    echo "Error: Days old must be a positive integer."
    exit 1
fi

echo "--- Initiating Cleanup Script ---"
echo "Target Directory: $TARGET_DIR"
echo "Files older than: $DAYS_OLD days"
echo "Dry Run: $DRY_RUN"

if [ "$DRY_RUN" = "true" ]; then
    echo "Performing a DRY RUN. No files will be deleted."
    echo "Files that WOULD BE deleted:"
    find "$TARGET_DIR" -type f -mtime +"$DAYS_OLD" -print
    echo "--- Dry Run Complete ---"
else
    read -p "WARNING: This will PERMANENTLY DELETE files. Are you sure you want to proceed? (y/N): " -n 1 -r
    echo
    if [[ $REPLY =~ ^[Yy]$ ]]; then
        echo "Proceeding with actual deletion..."
        find "$TARGET_DIR" -type f -mtime +"$DAYS_OLD" -delete
        echo "Cleanup complete. Old files deleted."
    else
        echo "Aborted by user."
    fi
fi