软件包：id-utils（4.6.28-20200521ss15dab） [debports]
Fast, high-capacity, identifier database tool
Actually, the term `identifier' is too limiting--`mkid' stores tokens, be they program identifiers of any form, literal numbers, or words of human-readable text. Database queries can be issued from the command-line, or from within emacs, serving as an augmented tags facility.