fselect

TLDR

Select full path and size from temporary or config files in a given directory

$ fselect size, path from [path/to/directory] where name = ['*.cfg'] or name = ['*.tmp']

Find square images

$ fselect path from [path/to/directory] where width = height

Find old-school rap 320kbps MP3 files

$ fselect path from [path/to/directory] where genre = [Rap] and bitrate = [320] and mp3_year lt [2000]

Select only the first 5 results and output as JSON

$ fselect size, path from [path/to/directory] limit [5] into json

Use SQL aggregate functions to calculate minimum, maximum and average size of files in a directory

$ fselect "[MIN(size), MAX(size), AVG(size), SUM(size), COUNT(*)] from [path/to/directory]"