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'cp' and slack space

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Special Forums Hardware Filesystems, Disks and Memory 'cp' and slack space
# 1  
Old 05-16-2007
'cp' and slack space
Does the 'cp' command copy the slack space of the copied file to the new location(e.g. CDROM, TAPE)?

I've read that slack space is only copied in a bitstream copy/backup. Is the 'cp' utility a bitstream copy?
# 2  
Old 05-17-2007
This is a good question, actually, each filesystem has its own rules for slack space. Let's consider UFS or ext3, as they act the same in this meaning :
Quote:
By default, sparse SOURCE files are detected by a crude heuristic and the corresponding DEST file is made sparse as well. That is the behavior selected by --sparse=auto. Specify --sparse=always to create a sparse DEST file whenever the SOURCE file contains a long enough sequence of zero bytes. Use --sparse=never to inhibit creation of sparse files.
where sparse files are a type of computer files that attempt to use file system space more efficiently; so, "cp" by default doesn't use slack space, means , it's optimized for work.
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