Pinboard on your command line.
gem install pinboard-cli
Get your API key from https://pinboard.in/settings/password and place it in ~/.pinboard-token.
Then just run the client:
$ pinboard -h
Usage: pinboard [options] [keywords...]
Configuration:
Put your Pinboard API key into ~/.pinboard-token
You can find that key here: https://pinboard.in/settings/password
-a, --all Search everything (href, description, extended, tags)
-d, --description Search only description (default)
-e, --extended Search only extended
-t, --tags Search only tags
-o, --or OR keywords
-u, --update Update if neccessary
-n, --[no-]color Suppress color output