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MKZFTREE(1)                     H. Peter Anvin                     MKZFTREE(1)

       mkzftree - Create a zisofs/RockRidge compressed file tree

       mkzftree [OPTIONS]... INPUT OUTPUT

       Takes an input file tree (INPUT) and create a corresponding compressed
       file tree (OUTPUT) that can be used with an appropriately patched
       mkisofs(8) to create a transparent-compression ISO 9660/Rock Ridge
       filesystem using the "ZF" compression records.

       -f, --force
              Always compress all files, even if they get larger when

       -z level, --level level
              Select compression level (1-9, default is 9).  Lower compression
              levels are faster, but typically result in larger output.

       -u, --uncompress
              Uncompress an already compressed tree.  This can be used to read
              a compressed filesystem on a system which cannot read them

       -p parallelism, --parallelism parallelism
              Compress in parallel.  The parallelism value indicates how many
              compression threads are allowed to run.

       -x, --one-filesystem
              Do not cross filesystem boundaries, but create directory stubs
              at mount points.

       -X, --strict-one-filesystem
              Do not cross filesystem boundaries, and do not create directory
              stubs at mount points.

       -C path, --crib-path path
              Steal ("crib") files from another directory if it looks (based
              on name, size, type and modification time) like they match
              entries in the new filesystem.  The "crib tree" is usually the
              compressed version of an older version of the same workload;
              this thus allows for "incremental rebuilds" of a compressed
              filesystem tree.  The files are hardlinked from the crib tree to
              the output tree, so if it is desirable to keep the link count
              correct the crib path should be deleted before running mkisofs.
              The crib tree must be on the same filesystem as the output tree.

       -l, --local
              Do not recurse into subdirectories, but create the directories

       -L, --strict-local
              Do not recurse into subdirectories, and do not create

       -F, --file
              Indicates that INPUT may not necessarily be a directory; this
              allows operation on a single file.  Note especially that if -F
              is specified, and INPUT is a symlink, the symlink itself will be
              copied rather than whatever it happens to point to.

       -s, --sloppy
              Treat file modes, times and ownership data as less than precious
              information and don't abort if they cannot be set.  This may be
              useful if running mkisofs on an input tree you do not own.

       -v, --verbose
              Increase the program verbosity.

       -V value, --verbosity value
              Set the program verbosity to value.

       -q, --quiet
              Issue no messages whatsoever, including error messages.  This is
              the same as specifying -V 0.

       -h, --help
              Display a brief help message.

       -w, --version
              Display the release version.

       Long options (beginning with --) may not work on all systems.  See the
       message printed out by mkzftree -h to see if this applies to your

       Inode change times (ctimes) are not copied.  This is a system
       limitation and applies to all file copy programs.

       If using the parallel option (-z) the access times (atimes) on
       directories may or may not be copied.  If it is important that the
       atimes on directories are copied exactly, avoid using -z.

       Written by H. Peter Anvin <>.

       Copyright (C) 2001-2002 H. Peter Anvin.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR


zisofs-tools                     30 July 2001                      MKZFTREE(1)


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