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So say you have a file that is written in XML or soe other coding language of that sort. Is it possible to just rewrite one line rather than getting the entire file into a string, then changing then line, then having to rewrite the whole string back to the file?
If the line you want to replace is larger than the new line that you want to replace it with, then it is possible as long as it is acceptable to have some kind of padding (for example white-space characters ‘ ‘) which will not effect your application.
If on the other hand the new content are larger than the content to be replaced you will need to shift all the data downwards, so you need to rewrite the file, or at least from the replaced line onwards.
Since you mention XML, it might be you are approaching your problem in the wrong way. Could it be that what you need is to replace a specific XML node? In which case you might consider using DOM to read the XML into a hierarchy of nodes and adding/updating/removing in there before writing the XML tree back to the file.