epics-base/documentation/new-notes/PR-679.md

Apply log prefix to each line

If multi-line ioc log messages are sent with errlogPrintf(), apply logClientPrefix (e.g. set by iocLogPrefix) to each line in order to help browsing the log files. Also strip off any leading newlines which some calls have.

Extend errlog iocsh command to interpret escape chars (just like echo).