A simple bash script that uses standard unix utilities sed, tr,
sort, uniq, and grep, as well as curl and jq, to generate a
BibTex database automatically from a LaTeX "[doc].aux" file.
The syntax is simply
adsbib [doc].aux
It also checks for "[doc].map" and uses it as a key map.
Because ADS now requires API keys, user should provide their keys in
the "~/.adsbibrc" file.