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For clean log, shell script already exist in path-to-magento/shell directory:

php log.php 
 Usage:  php -f log.php -- [options]
         php -f log.php -- clean --days 1

   clean             Clean Logs
   --days      Save log, days. (Minimum 1 day, if defined - ignoring system value)
   status            Display statistics per log tables
   help              This help

For clean cache, following methods will help you to make a shell script:

 // Clean js and css
 Mage::getModel('core/design_package')->cleanMergedJsCss();
 Mage::dispatchEvent('clean_media_cache_after');

 // product image
 Mage::getModel('catalog/product_image')->clearCache();
 Mage::dispatchEvent('clean_catalog_images_cache_after');

 // Get cache types
 Mage::app()->getCacheInstance()->getTypes()

 // Clean specific tags
 Mage::app()->cleanCache($tags);

 // dispatch event if you flush all cache tags
 Mage::app()->cleanCache($alltags);
 Mage::dispatchEvent('adminhtml_cache_flush_system');