How to query RIPE database on the command line?

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http://unix.stackexchange.com – Using the stock whois (on Fedora) I can easily get information for an IP adress: $ whois SOME_IP % This is the RIPE Database query service. % The objects are in RPSL format. % % The RIPE Database is subject to Terms and Conditions. [..] % Information related to 'SOME_IP/SOME_AS' route: SOME_ROUTE mnt-by: SOME_STRING [..] Now I want to inverse lookup entries that have the SOME_STRING in 'mnt-by'. I've done that successfully via the RIPE web interface. But how to do that via the command line? (e.g. for easier post-processing/scripting) RIPE documents the -i option, but: $ whois.md (HowTos)