Identifying contents with $Load

One can have GAMS tell you the general contents of a GDX file by using the $Load command without the name of a parameter.  Namely inserting a sequence like

$GDXin tran2

$load

$GDXin

yields (gdxcontents.gms)

Content of GDX C:\GAMS\GAMSPDF\BIGONE\TRAN2.GDX

    Number Type      Dim   Count  Name

 1   Set        1      2    i       canning plants

 2   Set        1      3    j       markets

 3   Parameter  2      6    d       distance in thousands of miles

 4   Parameter  0      1    f       freight in dollars per case per thousand miles

 5   Parameter  1      2    dem     capacity of plant i in cases

 6   Parameter  1      3    sup     demand at market j in cases

 7   Variable   2      6    x       shipment quantities in cases

 8   Equation   1      2    supply  observe supply limit at plant i

which lists the items present by Type, Name, Number of sets the item is defined over(Dim), number of elements in the file for this item (Count).