There are a many useful utilities on E-Smith, I'll summarize a few of the following:
df -h (Return the free space of the drive, Human Readable)
du -h --max-depth=1 /home/e-smith/files/users (Return the sizes of the user directories)
free -m (Return the memory used, in Megabytes)
/sbin/e-smith/console (Access the E-Smith console without having to login as admin)
lynx (Nice text based web browser)
top (Process information and resource utilization)
Hope this was useful,
Nathan