I duplicated a hard disk to a new larger one using the method suggested in Full DD copy from hdd to hdd.
After doing that
df -h reports the original and smaller partition sizes from the original disk and
gparted highlights the disparity and offers to fix them, though it seems unwise as they are mounted. If you look closely at the image you can see that
Used + Unused < Size for the partitions with the yellow warning signs.
What command line tools can be used to fix the issue, and will it be safe for
gparted to do it on mounted partition live? Ideally I should have done that before switching over to the target disk and rebooting from it.
Below is the information dialog from gparted about the discrepancy and I edited the title to describe it better.