[ferret_users] SHOW VAR/DATA_SET wrongly counts long name attribute

[Hella Riede <hella.riede@xxxxxxx>]

Dear ferret list,

from the ferret manual: "SHOW VARIABLES/DATA_SET: Lists variables 
associated with the named dataset by DEFINE VARIABLE/DATA_SET="

This works as expected:
yes? let/d=4 test = 1
yes? sh var/data_set=4
     TEST[D=ex_traj2] = 1

However, when I used it for information about a file variable in the 
following way, I got strange results:
yes? sh var/data rh
 rh var # 5 of dataset ./ex_traj2.nc
 rh var # 6 of dataset

The first number refers to the position of the queried variable in the 
file. But the second number additionally sums up "1" for the "long_name" 
attribute when it first appears.

Here is a dump of the file:
yes? sh da 4
4> ./ex_traj2.nc  (default)
name  title      I    J    K    L    M    N
LAT              ...  ...  ...  1:3  ...  ...
LON              ...  ...  ...  1:3  ...  ...
LEVEL            ...  ...  ...  1:3  ...  ...
PRESS  pressure  ...  ...  ...  1:3  ...  ...
RH     rel hum   ...  ...  ...  1:3  ...  ...
TEMP   temperat  ...  ...  ...  1:3  ...  ...

yes? sh var/data lat
 lat var # 1 of dataset ./ex_traj2.nc
 lat var # 1 of dataset
yes? sh var/data lon
 lon var # 2 of dataset ./ex_traj2.nc
 lon var # 2 of dataset
yes? sh var/data level
 level var # 3 of dataset ./ex_traj2.nc
 level var # 3 of dataset
yes? sh var/data press
 press var # 4 of dataset ./ex_traj2.nc
 press var # 5 of dataset
yes? sh var/data rh
 rh var # 5 of dataset ./ex_traj2.nc
 rh var # 6 of dataset
yes? sh var/data temp
 temp var # 6 of dataset ./ex_traj2.nc
 temp var # 7 of datase

I guess this function IS somehow intended as the output is nicely 
configured, but it's certainly also confusing.

Best wishes,
Hella