>> It was fabulous at that time. The first time you create a file, it
>> gets ";1" appended to it's filename. When you edit it, it gets saved
>> under the same name, this time appended by ";2". Edit it again...
>> whell, you get the picture. Cleaning up was as simple as "$ PURGE
>> /KEEP=3" to keep the last three versions.
> Its trickier than that - because all your other semantics have to align,
> its akin to the undelete problem (in fact its identical). Do you version on
> a rewrite, on a truncate, only on an O_CREAT ?
The Sintran OS for the Norsk Data minicomputers had something similar. A
new version was created every time a file was opened for writing.
It had its disadvantages. A typical machine where I worked at the time
had one 60MB disk. However, you could set the number of copies on a
per-file-basis, so big databases wouldn't have to be duplicated.
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