<russiango...@gmail.com> ha escrit:

> For example, when creating an archive, set the modification time for
> comparison. The required mtime can be set via the option. If the
> modification time of a file from the archive list is newer than the
> specified one, issue an appropriate warning and possibly not a zero
> return code.

Use the --verify option during creation:

https://www.gnu.org/software/tar/manual/html_section/tar_80.html

Regards,
Sergey

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