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This could be followed by the command above to set the file date as well.
(look-up tables for internal use which I do not want to export) and only want to worry about updating individual objects. As an aside, am I right in assuming that a new environment created in the scope of a function is destroyed after the function call?
I haven't managed to work out if there is a standard way to do this, so created my own function.
If the file never has its permissions changed, it might happen to hold the creation time, but this is a coincidence.
Explicitly changing the file modification time counts as a metadata change, so will also have the side effect of updating the as a metadata change time is from POSIX.