mksquashfs -version (return code: 0)
mksquashfs version 4.3-git (2014/06/09) copyright (C) 2014 Phillip Lougher <email@example.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
mksquashfs -HELP (return code: 1)
SYNTAX:mksquashfs source1 source2 ... dest [options] [-e list of exclude dirs/files] Filesystem build options: -comp <comp> select <comp> compression Compressors available: gzip (default) lzma lzo lz4 xz -b <block_size> set data block to <block_size>. Default 128 Kbytes Optionally a suffix of K or M can be given to specify Kbytes or Mbytes respectively -no-exports don't make the filesystem exportable via NFS -no-sparse don't detect sparse files -no-xattrs don't store extended attributes -xattrs store extended attributes (default) -noI do not compress inode table -noD do not compress data blocks -noF do not compress fragment blocks -noX do not compress extended attributes -no-fragments do not use fragments -always-use-fragments use fragment blocks for files larger than block size -no-duplicates do not perform duplicate checking -all-root make all files owned by root -force-uid uid set all file uids to uid -force-gid gid set all file gids to gid -nopad do not pad filesystem to a multiple of 4K -keep-as-directory if one source directory is specified, create a root directory containing that directory, rather than the contents of the directory -fstime secs Set fs time to seconds since epoch. Default to current time Filesystem filter options: -p <pseudo-definition> 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 -wildcards Allow extended shell wildcards (globbing) to be used in exclude dirs/files -regex Allow POSIX regular expressions to be used in exclude dirs/files Filesystem append options: -noappend 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 root Mksquashfs runtime options: -version print version, licence and copyright message -exit-on-error treat normally ignored errors as fatal -recover <name> recover filesystem data using recovery file <name> -no-recovery don't generate a recovery file -info print files written to filesystem -no-progress don't display the progress bar -progress display progress bar when using the -info option -processors <number> Use <number> processors. By default will use number of processors available -mem <size> Use <size> physical memory. Currently set to 248M Optionally a suffix of K, M or G can be given to specify Kbytes, Mbytes or Gbytes respectively Miscellaneous options: -root-owned alternative name for -all-root -noInodeCompression alternative name for -noI -noDataCompression alternative name for -noD -noFragmentCompression alternative name for -noF -noXattrCompression alternative name for -noX -Xhelp print compressor options for selected compressor Compressors available and compressor specific options: gzip (default) -Xcompression-level <compression-level> <compression-level> should be 1 .. 9 (default 9) -Xwindow-size <window-size> <window-size> should be 8 .. 15 (default 15) -Xstrategy strategy1,strategy2,...,strategyN Compress using strategy1,strategy2,...,strategyN in turn and choose the best compression. Available strategies: default, filtered, huffman_only, run_length_encoded and fixed lzma (no options) lzo -Xalgorithm <algorithm> Where <algorithm> is one of: lzo1x_1 lzo1x_1_11 lzo1x_1_12 lzo1x_1_15 lzo1x_999 (default) -Xcompression-level <compression-level> <compression-level> should be 1 .. 9 (default 8) Only applies to lzo1x_999 algorithm lz4 -Xhc Compress using LZ4 High Compression xz -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, ia64 -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.