out.txt

$ ./trimet.sh routes=100
signMessage       routeNumber lastLocID nextLocID delay latitude   longitude
Blue to SW 185th  100         10117     10121     -147  45.5109047 -122.7142741
Blue to Gresham   100         9758      8333      -1194 45.519884  -122.6844158
Blue to E 197th   100         8349      8350      -136  45.5224024 -122.5284551
Blue to Gresham   100         8350      8351      -117  45.5222426 -122.5068932
Blue to Gresham   100         9758      8333      -1205 45.5192354 -122.6819898
Blue to Gresham   100         9828      9822      58    45.5034006 -122.8389054
Blue to SW 185th  100         8371      8372      -123  45.535821  -122.5859749
Blue to SW 185th  100         8377      8378      -167  45.525233  -122.6714482
Blue to Hillsboro 100         9624      9818      -142  45.5056286 -122.7815981
Blue to Gresham   100         8356      8357      52    45.5030584 -122.4292709
Blue to Hillsboro 100         9845      9848      -380  45.5215741 -122.9909788
Blue to Gresham   100         9758      8333      -419  45.5206768 -122.6873764
Blue to Hillsboro 100         8360      8361      5     45.5049641 -122.4339578
Blue to Hillsboro 100         9832      9833      -202  45.5184063 -122.8736237
Blue to Hillsboro 100         8375      8376      117   45.5301126 -122.6618912
Blue to Hillsboro 100         9845      9848      243   45.5222021 -122.9909895

trimet.sh

#!/bin/bash
# Show positions of Tri-Met vehicles
# Requires `json` tool: npm install -g jsontool

APPID="YOUR-APPID-HERE-PLZ"
HEADER="signMessage routeNumber lastLocID nextLocID delay latitude longitude"
SEPARATOR=$(printf "\x1f")

function join { local IFS="$1"; shift; echo "$*"; }

curl -s "http://developer.trimet.org/beta/v2/vehicles?appID=$APPID&$@" \
    | json resultSet.vehicle \
    | json -a $HEADER -d $SEPARATOR \
    | (join $SEPARATOR $HEADER && cat) \
    | column -t -s $SEPARATOR -o " "