On Mon 07 May 2018 at 06:31:16 (-0500), Richard Owlett 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.
If you have multiple outputs, I'm intrigued to know how you automate the decision between writing to one output or another. > I suspect long term I want "rsync" [ *MUCH* reading to do! ] > > > >>Any way to accomplish that without explicitly listing all directories except > >>/media ? > > > >If it is indeed a bug with cp -x, then you could use some archiver like > >"tar" which has options to exclude a file. > > > Get inspiration from googling "tar pipe for copying". > > Although I wish to avoid "tar", I did get inspiration for a brute > force method - I'll try it first before commenting. I'm interested to know, if you have a file with a pathname that's, say, 4090 characters long, how that gets written to a directory whose name is more than half a dozen characters. IOW how does tar succeed where cp failed? Cheers, David.
