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  com-

       -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 directo-

       -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 sys-

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

       If using the parallel option (-z) the access times (atimes) on directo-
       ries 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 © 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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