Requirements

bash and friends (diff, grep, cat)

(Failing) Unit Test

./unit_test.sh

./texttest_fixture.sh

Specify days:

./texttest_fixture.sh 30

Verify againt ThirtyDays/stdout.gr

./verify.sh

BTW, the script is a pure "function", so this works:

$ echo -e 'Aged Brie|3|5\nOther Item|4|5' |
> ./gilded_rose.sh |
> ./gilded_rose.sh |
> ./gilded_rose.sh
Aged Brie|0|8
Other Item|1|2