usage: /usr/bin/lookbib [-i fields] [-t maximum-key-length] database ...
usage: /usr/bin/lookbib {-v | --version}
usage: /usr/bin/lookbib --help

GNU lookbib writes a prompt to the standard error stream (unless the
standard input stream is not a terminal), reads from the standard
input a line containing a set of keywords, searches each
bibliographic "database" for references containing those keywords,
writes any references found to the standard output stream, and
repeats this process until the end of input.  See the lookbib(1)
manual page.