watch -d -n 2 df -Th; ls -FlAt;
d => (differences) Highlight changes between iterations.
n => (interval) Run the command every seconds.
df => report file system disk space usage.
T => print file system type.
h => print sizes in human readable format.
ls => list directory contents.
F => (classify)append indicator (one of */=>@|) to entries.
l => a long listing format.
A => do not list implied.
t => sort by modification time.
It will update files are getting written on our file system.It highlights if a file get modified,and you will know what your granted SSH access users exactly modifying.