Sort numbers in every string of test.txt

Sort.rexx

/* REXX (OS/2) */
Parse arg filename
call stream filename, 'C', 'Open'
Do while Lines(filename)
  line = linein(filename)
  Parse value line with left ' ' right
  If left > right Then line = right || ' ' || left
  pos=stream(filename, 'C', 'Seek -'Length(line)+2)
  call lineout filename, line
End
call stream filename, 'C', 'Close'
Exit

test(result).txt

11 34
8 66
1 9
4 10
1 99
98 325

test.txt

11 34
66 8
1 9
10 4
99 1
325 98