Who knows if when working in the single user mode that any command are logged or could b elogged specially if I do a fsck I like at least to see when I did start it.
You can always script it to a log file before you do any maintenance in single user.
eg. #script /var/tmp/fsck.log --> followed by your task
#fsck -y -F ufs /dev/rdsk/c1t0d0s3
once done, #exit