Found a super-handy command today. fselect is a program that imitates SQL SELECT syntax for filesystem searches. Examples:
fselect path FROM / WHERE is_shebang = TRUE # Writes a list of all interpreter scripts to stdout. Also a lot of permission denied errors to stderr.
fselect path, size FROM ~ WHERE name LIKE '.%' AND is_file = TRUE ORDER BY size DESC # Writes a list of hidden files in your home directory somewhere from biggest to smallest.