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Knowing when a filesystem is created , you can deduce when an operating system was installed .
find filesystem device (/dev/) informations by using the cat /etc/fstab command.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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Better than reading the (maybe) modified /etc/fstab, is using mtab, ie:
read FS </etc/mtab && set -- $FS && echo $1Besides that, dumpe2fs doesn't work for non e{2,3,4} formatted filesystems.
works great for ext2* filesystems. Now what about the rest of the world, eh?