SQLPLUS @ command should open script file with a WRITE lock

I know that this might be considered petty; but there are at least two reasons why it would be nice if the @command files were locked while processing.
(1) It is currently possible to edit the file while it is processing. Sqlplus reads the file line by line; so the same line might be read more than once, or lines might be lost depending on whether the editor added or removed lines. I seem to fall into this error when I am busy, launch a long running script and then, 10 minutes later, think of a change I want to make and start editing the file. In any event, it seems logical to me that SQLPLUS might legitimately require that once an @ command file has started processing that it be locked for changes while processing.
(2) While it is all well and good just to say that I shouldn't do that, the number of times in the last 25 years that I have put spool file.sql instead of spool file.log in a command file called file.sql beggers the imagination. Sometimes my fingers just type faster than my brain. The result of this typo is that in combination with (1), file.sql is overwritten and terminates having done nothing except replace itself with an empty file.
I know that these problems could easily be avoided if I was perfect; but I've been doing this long enough to know that I'm not and never going to be.
So just my 2 cents worth as a suggestion.
Thank you, Mark
Edited by: mmillman on Dec 3, 2009 2:17 PM

If you ever find this answer, it would be extremely useful to me right now.

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user9357436 wrote:
hi experts
Can you help with some problems please?
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****************USERB******************so remove PROMPT line from the file
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>
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> When I try to open a file created in freehand it tells
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> your request because an unknown command was
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> on a lot of files. However, when I go to "my computer"
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