If you are working in SPSS itself, you can get help for that at IBM SPSS Statistics - Support
If you are working in SAS, you'll need to import the data first, then use PROC CONTENTS to get info about the dataset and columns:
PROC IMPORT OUT=WORK.MY_SPSS_DATA
FILE="DRIVE:\path\my_spss_file.sav"
DBMS=SPSS REPLACE;
RUN;
PROC CONTENTS DATA=WORK.MY_SPSS_DATA;
RUN;