1WIMOPTIMIZE(1)                   User Commands                  WIMOPTIMIZE(1)
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NAME

6       wimoptimize - Optimize a WIM archive
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SYNOPSIS

9       wimoptimize WIMFILE [OPTION...]
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DESCRIPTION

12       wimoptimize,  or  equivalently  wimlib-imagex  optimize,  rebuilds  the
13       standalone WIM archive WIMFILE.  The new WIM is written to a  temporary
14       file,  and  it  is  renamed to the original file when it's ready.  This
15       will remove any holes that have been left in the WIM as a result of ap‐
16       pending or deleting files or images, so the new WIM may be smaller than
17       the old WIM.
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19       By default, wimoptimize will reuse (not recompress) compressed data and
20       will  not  change  the solid or pipable status of the WIM.  However, it
21       can also perform recompression and/or convert between solid, non-solid,
22       pipable, and non-pipable WIMs; see the options and examples below.
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OPTIONS

25       --check
26             Before  optimizing  the  WIM, verify its integrity if it contains
27             extra integrity information.  Also include extra integrity infor‐
28             mation in the optimized WIM, even if it was not present before.
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30       --nocheck
31             Do  not include extra integrity information in the optimized WIM,
32             even if it was present before.
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34       --include-integrity
35             Include extra integrity information in the  optimized  WIM,  i.e.
36             like --check but don't also verify the WIM beforehand.
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38       --recompress
39             Recompress  all  data  in the WIM while optimizing it.  This will
40             significantly increase the time needed to optimize the  WIM,  but
41             it  may  result  in a better compression ratio if wimlib can do a
42             better job than the program that created the  WIM  ---  which  is
43             likely  the  case  if  the WIM was Microsoft-created, as wimlib's
44             compressors are slightly stronger.
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46       --compress=TYPE[:LEVEL]
47             Recompress the WIM using the specified compression type, and  op‐
48             tionally  the  specified  compression  level for that compression
49             type.  This implies --recompress.  See the documentation for this
50             option to wimcapture(1) for more details.
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52       --chunk-size=SIZE
53             Set  the  WIM compression chunk size to SIZE.  See the documenta‐
54             tion for this option to wimcapture(1) for more details.
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56       --solid
57             Create a "solid" archive that compresses multiple files together.
58             This  usually results in a significantly better compression ratio
59             but has disadvantages such as  reduced  compatibility.   See  the
60             documentation for this option to wimcapture(1) for more details.
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62       --solid-compress=TYPE[:LEVEL]
63             Like  --compress,  but set the compression type used in solid re‐
64             sources.  See the documentation for this option to  wimcapture(1)
65             for more details.
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67       --solid-chunk-size=SIZE
68             Like  --chunk-size,  but  set  the  chunk  size used in solid re‐
69             sources.  See the documentation for this option to  wimcapture(1)
70             for more details.
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72       --threads=NUM_THREADS
73             Number  of threads to use for compressing data.  Default: autode‐
74             tect (number of processors).
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76       --pipable
77             Rebuild the WIM so that it can be applied fully sequentially, in‐
78             cluding  from  a  pipe.  See wimcapture(1) for more details about
79             creating pipable WIMs.  By default,  when  neither  --pipable  or
80             --not-pipable  is specified, the optimized WIM will be pipable if
81             and only if it was pipable before.
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83       --not-pipable
84             Rebuild the WIM in the non-pipable format.
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86       --unsafe-compact
87             Compact the WIM in-place, without using a temporary file.  Exist‐
88             ing  resources  are  shifted down to fill holes and new resources
89             are appended as needed.  The WIM is truncated to its final  size,
90             which may shrink the on-disk file.  This is more efficient than a
91             full rebuild, but it is only supported when no  recompression  is
92             being  done.   More  importantly,  AN UNSAFE COMPACTION OPERATION
93             CANNOT BE SAFELY INTERRUPTED!  If the operation  is  interrupted,
94             then  the  WIM will be corrupted, and it may be impossible (or at
95             least very difficult) to recover any data from it.  Users of this
96             option  are  expected  to know what they are doing and assume re‐
97             sponsibility for any data corruption that may result.
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NOTES

100       wimoptimize does not support split WIMs or delta WIMs.  For such files,
101       consider  using wimexport(1) instead.  Note that wimoptimize is roughly
102       equivalent to:
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104              wimexport WIMFILE all tmp.wim && mv tmp.wim WIMFILE
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EXAMPLES

107       Rebuild 'install.wim':
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109              wimoptimize install.wim
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111       Rebuild and recompress 'install.wim':
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113              wimoptimize install.wim --recompress
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115       Rebuild and recompress 'install.wim' using LZX ("maximum")  compression
116       at a higher-than-default compression level.  The compression chunk size
117       remains unchanged.  This command will be slow, but it might  be  useful
118       for optimizing files for distribution.  See https://wimlib.net/compres
119       sion.html for some benchmark results.
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121              wimoptimize install.wim --compress=LZX:100
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123       Recompress 'install.wim' using solid-mode compression, then  rename  it
124       to  ´install.esd´.   This will decrease the archive size significantly.
125       (Also consider using 'wimexport install.wim all install.esd --solid'.):
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127              wimoptimize install.wim --solid
128              mv install.wim install.esd
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SEE ALSO

131       wimlib-imagex(1) wimexport(1) wimverify(1)
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135wimlib 1.13.4                     April 2021                    WIMOPTIMIZE(1)
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