Call date(1) in order to display the current time/date
(‘DATE’).

Call finger(1) in order to display information about local and
remote users  (‘FINGER’).

Call mount(1) in order to display a list of the currently
mounted file systems (‘MOUNTED-FILE-SYSTEMS’).

Call quota(1) in order to display a user file system disk quota
and quota (‘QUOTA’).

Call df(1) in order to get the status of the currently mounted
file systems (‘DISK-FREE-SPACE’).

Call users(1) in order to get the name of the currently logged in
users (‘USERS’).

Call $GNUIT_VMSTAT(1) in order to get the current virtual memory
status.  This is very system dependent, Linux uses free,
other systems use vmstat, so the $GNUIT_VMSTAT variable is
used to deal with this (‘VIRTUAL-MEMORY-STATUS’).

$GNUIT_VMSTAT used to be called $GIT_VMSTAT. The old
name is still accepted for backwards-compatibility.

Call who(1) in order to find out who is on the system
(‘WHO’).