How do i get the last lsn number if i am Streaming the Backup?ly 2 ways i

Hi want to use the steaming feature of taking backup. Steaming works but i need to get the lsn number so that i can take incrementals later. The only 2 ways i see is i will have to openup the backup tar and read the backup file or from stdout get the last lsn. Question is , is there a better way ?

Use the parameter --extra-lsndir=path to make innobackupex write a copy of the xtrabackup_checkpoints file in a specific directory. You can then extract the LSN from this file after the backup finished.