Programs: shell libraries

Bash doesn't exactly have libraries per se, but there are some bash-front ends to libraries (like curses) that allow you to interact with them from shellscripts.

UI

dialog (shell)	bash interface for the curses library
bash-oo-framework	OOP, exceptions, etc in bash
tput	get info from the termcap db

Structured Text

jq	parse json
yq	parse yaml
tomlq	parse toml
dasel	parse json, yaml, toml, xml, csv. no external deps.
csvsql	SQL queries to CSV files

Testing

bats	test framework for bash