tar: one
1
1 6.10 Crossing File System Boundaries
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1
1 'tar' will normally automatically cross file system boundaries in order
1 to archive files which are part of a directory tree. You can change
1 this behavior by running 'tar' and specifying '--one-file-system'. This
1 option only affects files that are archived because they are in a
1 directory that is being archived; 'tar' will still archive files
1 explicitly named on the command line or through '--files-from',
1 regardless of where they reside.
1
1 '--one-file-system'
1 Prevents 'tar' from crossing file system boundaries when archiving.
1 Use in conjunction with any write operation.
1
1 The '--one-file-system' option causes 'tar' to modify its normal
1 behavior in archiving the contents of directories. If a file in a
1 directory is not on the same file system as the directory itself, then
1 'tar' will not archive that file. If the file is a directory itself,
1 'tar' will not archive anything beneath it; in other words, 'tar' will
1 not cross mount points.
1
1 This option is useful for making full or incremental archival backups
1 of a file system. If this option is used in conjunction with
1 '--verbose' ('-v'), files that are excluded are mentioned by name on the
1 standard error.
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