hledger/hledger/Hledger/Cli/Commands/Notes.md

notes
List the unique notes that appear in transactions.

_FLAGS

This command lists the unique notes that appear in transactions, in alphabetic order. You can add a query to select a subset of transactions. The note is the part of the transaction description after a | character (or if there is no |, the whole description).

Example:

$ hledger notes
Petrol
Snacks