Preserve a single space at the end of line using spool command

Hi,
Can you please help me to write the result of an sql query into a file with the last column of the row ending with a single space?
For example:
COL1DATA|COL2DATA|COL3DATA<space1>
As mentioned in the example the col3 value in the file should end with a single space. And there should not be any delimiters at the end of the row.
I tried with set trimspool on/off. But, it didn't work. When I say trimspool on - it is trimming all the trailing spaces.
When I say trimspool off - it is retaining all the trailing spaces to the size of the line.
But, I do not wish to modify the file through shell commands once it is written thru spool. I mean I do not wish to append spaces to the end of a line using shell script or any other method.
I do not wish to use other methods like UTL_FILE also.
Please help me how to do it using spool command?
Thank you.
Ramana

My requirement is that all the trailing spaces should be truncated except the last one in the row.Why?
As you have discovered a single column in sqlplus, is always a fixed length regardless of the size of the data, if the length of the data varies the output is padded to the maximum or line size with spaces. The trim and trimpsool commands are there to remove all the spaces from the end of a line if there are any. There are no commands to trim all the spaces except one, or even to trim all the spaces except two, or three even.
If you want such custom processing you should post process the file in the OS using sed, awk or perl or something designed for such things.

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Preserve a single space at the end of line using spool command

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