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Tom
Super User Tom
Super User

Try it an see.

filename junk temp;
data _null_;
  file junk;
  do len=10 to 0 by -1;
     x='12345678901234567890';
     put x $varying10. len ;
  end;
run;

data _null_;
  infile junk length=fred;
  input;
  put _n_= fred= @20 _infile_;
run;
_N_=1 fred=10      1234567890
_N_=2 fred=9       123456789
_N_=3 fred=8       12345678
_N_=4 fred=7       1234567
_N_=5 fred=6       123456
_N_=6 fred=5       12345
_N_=7 fred=4       1234
_N_=8 fred=3       123
_N_=9 fred=2       12
_N_=10 fred=1      1
_N_=11 fred=0
NOTE: 11 records were read from the infile JUNK.
      The minimum record length was 0.
      The maximum record length was 10.

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