It may not be exactly related to your requirement.

I'm trying to convey that when you see that file is not updated, there may be a case that the file handle not selected for automatic flushing. In such a case, you can use the select to make the file updation proper.

This is just to give you some clarification in the "files not altered" matter.

In reply to Re^3: Files not altered by balakrishnan
in thread Files not altered by bluethundr

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