How to trim var in Bash

To trim start

$ var="hello world"

$ echo "${var##* }"
> 'world'

$ echo "${var##*o}"
> 'rld'

$ echo "${var#*o}"
> ' world'

$ echo "${var#*l}"
> 'lo world'

$ echo "${var##*l}"
> 'd'

To trim start

$ var="hello world"

$ echo "${var%% *}"
> 'hello'

$ echo "${var%%o*}"
> 'hell'

$ echo "${var%o*}"
> 'hello w'

$ echo "${var%l*}"
> 'hello wor'

$ echo "${var%%l*}"
> 'he'

To trim two sides

$ var="Hello 'BARBIE' lol kek"

$ echo "${${var#*'}%%'*}"
> BARBIE