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Locator: Home > Catalogue > p7zip-9.20.1 README file
    	p7zip 9.20
    	==========

    Homepage : http://p7zip.sourceforge.net/

    p7zip is a port of the Windows programs 7z.exe and 7za.exe provided by 7-zip.

    7-zip is a file archiver with the highest compression ratio.
    Homepage : www.7-zip.org

      7z uses plugins (7z.so and Codecs/Rar29.so) to handle archives.
      7za is a stand-alone executable.
      7za handles less archive formats than 7z.exe.
      7zr is a light stand-alone executable that supports only 7z/LZMA/BCJ/BCJ2.

    NEW:
      7zG : see GUI/readme.txt

    CAUTION :
    ---------

    - FIRST : DO NOT USE the 7-zip format for backup purpose on Linux/Unix because :
      - 7-zip does not store the owner/group of the file

      On Linux/Unix, in order to backup directories you must use tar !
      to backup a directory  : tar cf - directory | 7za a -si directory.tar.7z
      to restore your backup : 7za x -so directory.tar.7z | tar xf -

    - if you want to send files and directories (not the owner of file)
      to others Unix/MacOS/Windows users, you can use the 7-zip format.

      example : 7za a directory.7z  directory

      do not use "-r" because this flag does not do what you think
      do not use directory/* because of ".*" files
       (example : "directory/*" does not match "directory/.profile")

    BUILD :
    -------

      If you have downloaded the "bin" package,
    	use directly the program bin/7za.
    	(tested on Redhat 9.0, Fedora 2, Mandrake 10.0, Debian 3.0)
    	As the program is statically linked, its should run on many x86 or amd64 linux.

      If you have downloaded the "source" package,

    	According to your OS, copy makefile.linux,
    	makefile.freebsd, makefile.cygwin, ...
            over makefile.machine

      Example : building 7za, 7z (with its plugins), 7zr and Client7z and passing the internal tests
    	cp makefile.linux_x86_asm_gcc_4 makefile.linux
    	make all_test

    	If you want to make a parallel build on a 4 cpu machine : make -j 4 TARGET

    	If you have trouble, try : make -f makefile.oldmake TARGET

    	make depend   : to rebuild the makefile.depend
    	make clean    : to clean all directories
    	make          : to build bin/7za
    	make sfx      : to build bin/7zCon.sfx (7za can now create SFX archive)
    	make 7z       : to build bin/7z and its plugins :
                              - "bin/7z.so" (GNU LGPL + AES code license)
                              - "bin/Codecs/Rar29.so" (GNU LGPL + unRAR restriction)
    	make 7zr      : to build bin/7zr
    	make all      : to build bin/7za and bin/7zCon.sfx
    	make all2     : to build bin/7za, bin/7z (with its plugins) and bin/7zCon.sfx
    	make all3     : to build bin/7za, bin/7z (with its plugins), bin/7zr and bin/7zCon.sfx
    	make test     : to test bin/7za (extracting, archiving, password ...)
    	make test_7z  : to test bin/7z  (extracting, archiving, password ...)
    	make test_7zr : to test bin/7zr (extracting, archiving, ...)

    	make 7zG      : to build bin/7zG and its plugins :
                              - "bin/7z.so" (GNU LGPL + AES code license)
                              - "bin/Codecs/Rar29.so" (GNU LGPL + unRAR restriction)
    	make test_7zG : to test bin/7zG (extracting, archiving, ...)

      this procedure has been tested on :
       - x86 CPU :
    	Linux - Debian 3.0 Stable
    	Linux - Ubuntu 10.10
    	MacOS 10.6.6

       - AMD64 CPU :
    	Linux - Ubuntu 10.10
    	MacOS 10.6.6

       - sparc CPU :
    	Solaris 8 (sparc) with gcc 2.95.2

       - powerpc CPU :
    	MacOS X 10.4 (ppc)

      Some older versions of p7zip were tested :
       - x86 CPU :
    	DOS   - (built with DJGPP, see http://blairdude.googlepages.com/p7zip )
    	Linux - Redhat 9.0 Standart
    	Linux - Fedora 2 (Redhat) (gcc 3.3.3 and gcc-3.4.1 with
                    stack-smashing protector from www.trl.ibm.com/projects/security/ssp/)
    	Linux - Mandrake 10.0 Official
    	Linux - Ubuntu 8.04
    	FreeBSD 5.2.1 (gcc 3.3.3)
    	MacOS 10.4.8
    	NetBSD
    	CYGWIN_NT-5.1 1.5.9(0.112/4/2) 2004-03-18 23:05 i686 Cygwin
    	Solaris  9 (x86) with gcc 3.3.2
    	Solaris 10 (x86)

       - alpha CPU :
    	Linux - Debian 3.0 (alpha) with gcc 2.95.4

       - AMD64 CPU :
    	Linux - SuSE 8 ES (AMD64 Opteron) with gcc 3.2.2
    	Linux - Fedora 4  (AMD64 Turion)  with gcc 4.0.1
    	Linux - Ubuntu 8.10

       - Itanium CPU :
            HP-UX B.11.31 U ia64 with aCC (HP C/aC++ B3910B A.06.14 [Feb 22 2007])

       - s390x CPU :
    	Linux - SUSE Enterprise Linux 10 - with gcc 4.1.2
    	( only the 32bits built works, the 64bits built does not pass the tests )

       - sparc CPU :
    	Solaris 9 (sparc) with gcc 3.3.2

       - powerpc CPU :
    	MacOS X 10.1/darwin 5.5 with gcc 932.1 (gcc 2.95.2)
    	MacOS X 10.3 with XCode 1.5

       - openpower CPU :
            Linux openpower-linux1 2.6.5-7.97-pseries64 (ppc64) with gcc 3.3.3

       - IBM :
    	AIX 5.3 with gcc 4.1.0

       - Tru64 :
    	OSF 5.1 with gcc 3.4.2

       - PA-RISC :
    	HP-UX 11.11 with aCC (HP ANSI C++ B3910B A.03.73)
    	HP-UX 11.11 with gcc 3.4.2 (7za and 7zr : OK, 7z : failed because of a buggy gcc for HP-UX,
                                        plugins don't work because C++ constructors are not called !)

    BUILD with cmake
    ----------------
      You can only build 7za.

      cd CPP/7zip/CMAKE

      edit generate.sh to choose your target

      ./generate.sh

      the cmake project for the target is in "CPP/7zip/CMAKE/Alone".

      For the target "Unix Makefiles", use "make" to compile

      For others target, use the IDE (CodeBlocks, KDevelop3, Eclipse CDT4)

    INSTALL :
    ---------

      method 1
      --------
      - edit install.sh to change DEST_HOME
      - ./install.sh : to install
      Remark : you must be "root" to install 7za in the directory "/usr/local"

      method 2
      --------
      - 7za is a stand-alone program, you can put this program where you want.
      example :  cp bin/7za /usr/local/bin/7za

      - 7z needs its plugins. You must copy the file 7z, 7z.so
        and the directory Codecs in the same destination directory.

      - if you want to be able to create SFX archive, copy bin/7zCon.sfx
      to the directory where 7za or 7z can be found.

    USAGE:
    ------
      Remark : you can replace 7za with 7z.

      7za t archive.7z  : tests files in the archive archive.7z
      7za l archive.7z  : lists all files from archive archive.7z
      7za x archive.7z  : extracts all files from archive archive.7z
                       to the current directory

      7za a archive.7z file1 fileN : add files to the archive archive.7z

      7za a archive.7z  dir1 :  add all files and subdirectories from directory "dir1" to archive archive.7z

      CAUTION : do not use the flag "-r" unless you know what you are doing ...

      7za a -sfx archive.exe dir1 : add all files from directory "dir1" to SFX archive archive.exe
      (Remark : SFX archive MUST end with ".exe")

      You can also add or extract files to/from .zip or .tar archives.
      You can also compress/uncompress .gz or .bz2 files.

      7za a -tzip   archive.zip file file2 file3
      7za a -ttar   archive.tar file
      7za a -tgzip  file.gz     file
      7za a -tbzip2 archive.bz2 file

      You can use password for archives:
      7za a -pmy_password archive.7z  dir1

      For .7z archive only, you can enable archive header encryption with "-mhe"
      7za a -mhe=on -pmy_password archive.7z  dir1

      For more, see the documentation of 7za.exe in DOCS/MANUAL directory
      7za a -t7z  -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on archive.7z  dir1
          adds all files from directory "dir1" to archive archive.7z
          using "ultra settings".
          -t7z     : 7z archive
          -m0=lzma : lzma method
          -mx=9    : level of compression = 9 (Ultra)
          -mfb=64  : number of fast bytes for LZMA = 64
          -md=32m  : dictionary size = 32 megabytes
          -ms=on   : solid archive = on

      To use the new codec "lzma2"
      7za a -m0=lzma2 archive.7z directory

    BENCHMARKS :
    ------------
      7za b : bench LZMA codec
      7z b -mm=crc : make internal crc check.

    hugetlbfs (large pages)
    ------------

      Using huges pages in Linux requires some preparations.
      First, make sure your running kernel has support for hugetlbfs compiled in:

      ~$ grep hugetlbfs /proc/filesystems
      nodev       hugetlbfs

      You can view your current huge page configuration like this:

      ~$ grep Huge /proc/meminfo
      HugePages_Total:       0
      HugePages_Free:        0
      HugePages_Rsvd:        0
      HugePages_Surp:        0
      Hugepagesize:       2048 kB

      In this case the size of a huge page is 2 MiB.
      So, if you have 2 GiB of RAM and want to reserve 512 MiB for huge pages,
      you would need 256 pages.

      Do the following as root:

      ~# echo 296 >/proc/sys/vm/nr_hugepages
      ~# grep Huge /proc/meminfo
      HugePages_Total:     296
      HugePages_Free:      296
      HugePages_Rsvd:        0
      HugePages_Surp:        0
      Hugepagesize:       2048 kB

      Finally, make access from user space possible:

      ~# mkdir /hugepages
      ~# mount -t hugetlbfs -o rw,nosuid,nodev,noexec,noatime none /hugepages
      ~# chmod 1777 /hugepages

      Option 1 : Now huge pages are configured.
               In your shell, set the environment variable HUGETLB_PATH to the mount point:
               ~$ export HUGETLB_PATH=/hugepages
      or

      Option 2 : Let p7zip find out the first directory with the type "hugetlbfs"

      To enable huge page use in p7zip, pass the '-slp' switch to it.
      Ex: 7za -slp a t.7z dir

      If you want this to be a permanent setup :
      - mkdir /hugepages

      - add an entry to your /etc/fstab so that when you reboot your computer,
        your hugetlbfs will mount automatically :
        hugetlbfs       /hugepages  hugetlbfs     rw,nosuid,nodev,noexec,noatime   0 0

      - add this in your /etc/rc.local :
        chmod 1777 /hugepages
        echo 296 >  /proc/sys/vm/nr_hugepages

      optional : export HUGETLB_PATH=/hugepages

      To enable huge page use in p7zip, pass the '-slp' switch to it : 7za -slp b

      Remark : with current CPU : "7za -slp b" is not faster than "7za b".
               If you want to see some speedup, compress at least 300MB
               Ex : 7za -slp -mx=9 -a big_file.tar.7z  big_file.tar

    LICENSE :
    ---------
      please read DOCS/License.txt.

    LIMITATIONS from 7-zip :
    ------------------------

      - does not support uid/gid for the .tar format (so, use tar on Unix)

    LIMITATIONS for Unix version only :
    -----------------------------------

      - can handle properly UNICODE filenames only if the environment is UTF-8.
      Example : export LANG=en_US.UTF-8 ; unset LC_CTYPE
      Remark  : see the possible values for LANG in the directory
                - /usr/lib/locale   : Fedora 2 / Solaris 8
                - /usr/share/locale : OpenBSD / Debian / FreeBSD / MacOS X / Mandrake 10.1 / NetBSD

    	On Linux, to display the available locales : locale -a

      p7zip relies on LC_CTYPE and then on LANG to convert name to/from UNICODE.
      the command "locale" should display these environment variables.
      you can also do "echo $LC_CTYPE" and "echo $LANG".

      If you do not plan to export your archive, you can use the flag "-no-utf16".
      Usage :
        7za a -no-utf16 archive.7z dirOrFile1 ... dirOrFileN
        7za t -no-utf16 archive.7z
        7za l -no-utf16 archive.7z
        7za x -no-utf16 archive.7z

      - ignores Windows file access permissions (files are created with default permissions)

      see also TODO file.

    DEVELOPPER CORNER:
    ------------------

      - WaitForMultipleObject has no equivalence on Unix.
      - Events don't exist.
      - sizeof(wchar_t) = 4 with GCC (2 with MS VC++)
      - "FIXME" in source code indicates that you should add codes to better handle all cases.

      - "FIXED" in source code indicates that the original code has been changed to work in Unix environment.

      see also TODO file.

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