Konrad Heuer wrote: [ ... ]
As far as I see there is little chance to do this without carefully restarting all processes, e.g. by shutting down into single user mode and returning to multi user mode.
It is advisable to switch into single-user mode when updating the system files, agreed.
If you replace program files and shared libraries used by currently running processes, this will cause the corresponding processes to be aborted abnormally in case of page fault requiring a page-in from the program files or shared libraries.
Generally not; the system doesn't delete files that are in use even if you overwrite those files: it hangs on to the inode and won't free the space until nobody needs that file.
-- -Chuck
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