This carries the actual text of the command line that failed to apply, in the same notification that reports the failing line number. Having the literal failing command text, rather than just its line number, lets an admin immediately recognize the problem, such as a command syntax that changed between firmware versions or a typo, without needing filesystem access to the config file at the exact moment of the failure. For example, this might carry the text configure vlan 4097 create, immediately telling the admin the failure is because VLAN ID 4097 exceeds the valid 802.1Q range.