The above method remounts all filesystems described in /etc/fstab.
Alternatively to remount only one, you could use
mount -o remount /
OR
mount -o remount /dev/sda1
The first one is preferred as you need not know the device name and number for the / partition.
More information about formatting options
The Linux Alternative Project Linux man pages iTech7
The above method remounts
The above method remounts all filesystems described in /etc/fstab.
Alternatively to remount only one, you could use
mount -o remount /
OR
mount -o remount /dev/sda1
The first one is preferred as you need not know the device name and number for the / partition.