Provided by: squashfs-tools_4.3-3ubuntu2.16.04.3_amd64 bug


       mksquashfs - tool to create and append to squashfs filesystems


       mksquashfs SOURCE [SOURCE2 ...] DESTINATION [OPTIONS]


       Squashfs  is  a highly compressed read-only filesystem for Linux. It uses zlib compression
       to compress both files, inodes and directories. Inodes in the system are  very  small  and
       all blocks are packed to minimize data overhead. Block sizes greater than 4K are supported
       up to a maximum of 64K.

       Squashfs is intended for general read-only filesystem use, for archival use (i.e. in cases
       where  a  .tar.gz  file may be used), and in constrained block device/memory systems (e.g.
       embedded systems) where low overhead is needed.


   Filesystem build options
       -comp COMPRESSION
           select COMPRESSION compression. Compressors available: gzip (default), lzo, xz.

       -b BLOCK_SIZE
           set data block to BLOCK_SIZE. Default 131072 bytes.

           don't make the filesystem exportable via NFS.

           don't detect sparse files.

           don't store extended attributes.

           store extended attributes (default).

           do not compress inode table.

           do not compress data blocks.

           do not compress fragment blocks.

           do not compress extended attributes.

           do not use fragments.

           use fragment blocks for files larger than block size.

           do not perform duplicate checking.

           make all files owned by root.

       -force-uid uid
           set all file uids to uid.

       -force-gid gid
           set all file gids to gid.

           do not pad filesystem to a multiple of 4K.

           if one source  directory  is  specified,  create  a  root  directory  containing  that
           directory, rather than the contents of the directory.

   Filesystem filter options
           Add pseudo file definition.

       -pf PSEUDO_FILE
           Add list of pseudo file definitions.

       -sort SORT_FILE
           sort  files  according  to  priorities in SORT_FILE. One file or dir with priority per
           line. Priority -32768 to 32767, default priority 0.

       -ef EXCLUDE_FILE
           list of exclude dirs/files. One per line.

           Allow extended shell wildcards (globbing) to be used in exclude dirs/files

           Allow POSIX regular expressions to be used in exclude dirs/files.

   Filesystem append options
           do not append to existing filesystem.

       -root-becomes NAME
           when appending source files/directories, make the original root become a  subdirectory
           in  the  new root called NAME, rather than adding the new source items to the original

   Mksquashfs runtime options:
           print version, licence and copyright message.

       -recover NAME
           recover filesystem data using recovery file NAME.

           don't generate a recovery file.

           print files written to filesystem.

           don't display the progress bar.

       -processors NUMBER
           Use NUMBER processors. By default will use number of processors available.

       -read-queue SIZE
           Set input queue to SIZE Mbytes. Default 64 Mbytes.

       -write-queue SIZE
           Set output queue to SIZE Mbytes. Default 512 Mbytes.

       -fragment-queue SIZE
           Set fragment queue to SIZE Mbytes. Default 64 Mbytes.

   Miscellaneous options
           alternative name for -all-root.

           alternative name for -noI.

           alternative name for -noD.

           alternative name for -noF.

           alternative name for -noX.

   Compressors available and compressor specific options
       gzip (no options) (default)

       lzo (no options)


       -Xbcj filter1,filter2,...,filterN
           Compress using filter1,filter2,...,filterN in turn (in addition  to  no  filter),  and
           choose  the  best  compression. Available filters: x86, arm, armthumb, powerpc, sparc,

       -Xdict-size DICT_SIZE
           Use DICT_SIZE as the XZ dictionary size. The dictionary size can  be  specified  as  a
           percentage  of  the  block  size, or as an absolute value. The dictionary size must be
           less than or equal to the block size and  8192  bytes  or  larger.  It  must  also  be
           storable in the xz header as either 2^n or as 2^n+2^(n+1). Example dict-sizes are 75%,
           50%, 37.5%, 25%, or 32K, 16K, 8K etc.




       More  information  about  mksquashfs  and  the  squashfs  filesystem  can  be   found   at


       squashfs was written by Phillip Lougher <>.

       This manual page was written by Daniel Baumann <>.