GET
  FILE='G:\UBC Library Final Documentation\Boston Lying-in inpatients 1886-1900.sav'.

WRITE OUTFILE='C:\Users\User\Documents\test.dat'
  TABLE /ALL.

Write will generate the following

Variable          Rec   Start     End  Format
age                 1       1       2  F2.0
byear               1       3       6  F4.0
resicodr            1       7       7  F1.0
bprcode             1       8       9  F2.0
marstat             1      10      10  F1.0
nuofpreg            1      11      12  F2.0
sex                 1      13      15  F3.0
weight              1      16      21  F6.1
prematur            1      22      22  F1.0
fee                 1      23      24  F2.0
season              1      25      32  F8.0
EXECUTE.