On 08/05/18 00:55, David Griffith wrote: > On May 7, 2018 4:31:16 AM PDT, Richard Owlett <rowl...@cloud85.net> wrote: >> On 05/06/2018 10:11 AM, Thomas Schmitt wrote: >>> Hi, >>> >>> Richard Owlett wrote: >>>> Thought I was doing that by specifying -x. >>> >>> Either cp -x has a bug or the target directory is not in a different >>> filesystem than "/" and not a mount point of such a filesystem. >>> >>> Check the device numbers of "/" and "/media/richard/MISC...". >>> E.g. like this >>> >>> $ stat / | fgrep Device >>> Device: 803h/2051d Inode: 2 Links: 25 >>> $ stat /bkp | fgrep Device >>> Device: 814h/2068d Inode: 2 Links: 7 >>> >>> Here "/bkp" has a different device number (2068) than "/" (2051). >>> So it (its inode, to be exacting) is in a different filesystem. >>> >>> As contrast see a directory in the same filesystem as "/": >>> >>> $ stat /home | fgrep Device >>> Device: 803h/2051d Inode: 2228225 Links: 60 >> >> I get: >> richard@debian-jan13:~$ stat / | fgrep Device >> Device: 80eh/2062d Inode: 2 Links: 22 >> richard@debian-jan13:~$ stat /media | fgrep Device >> Device: 80eh/2062d Inode: 131073 Links: 5 >> richard@debian-jan13:~$ >> >> I gather that "cp" is then an inappropriate tool. >> >> "tar" is inappropriate for my preferences - I was attempting to use >> "cp" >> as there would be multiple files &/or directories as input *and* >> output. >> >> I suspect long term I want "rsync" [ *MUCH* reading to do! ] > > > You will indeed want rsync. Essentially, "rsync -av [--delete] <source> > <destination> will serve most of your backup needs. >
I habitually include -x in there as well, which I suspect will be needed here. And for my uses, I always make sure there are trailing slashes on both source and destination. Richard
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