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       7za - A file archiver with highest compression ratio


       7za [adeltux] [-] [SWITCH] <ARCHIVE_NAME> <ARGUMENTS>...


       7-Zip  is  a  file  archiver  with  the  highest compression ratio. The
       program supports 7z (that implements LZMA compression algorithm),  ZIP,
       CAB,  ARJ,  GZIP,  BZIP2,  TAR,  CPIO, RPM and DEB formats. Compression
       ratio in the new 7z format is 30-50% better than ratio in ZIP format.

       7za is a stand-alone executable. 7za handles less archive formats  than
       7z, but does not need any others.


       a      Add

       d      Delete

       e      Extract

       l      List

       t      Test

       u      Update

       x      eXtract with full paths


              Include archives

              eXclude archives

       -bd    Disable percentage indicator

              Include filenames

       -l     don’t store symlinks; store the files/directories they point  to
              (CAUTION : the scanning stage can never end because of recursive
              symlinks like ’ln -s .. ldir’)

              Set    Compression     Method     (see     /usr/share/doc/p7zip-
              full/DOCS/MANUAL/switches/method.htm for a list of methods)

              7z  format  only : enables or disables archive header encryption
              (Default : off)

              Set Output directory

              Set Password

              Recurse subdirectories (CAUTION: this flag does not do what  you
              think, avoid using it)

              Create SFX archive

       -si    Read  data  from  StdIn  (eg:  tar  cf  -  directory | 7za a -si

       -so    Write data to StdOut (eg: % echo foo | 7z a dummy -tgzip -si -so
              > /dev/null)

       -slt   Sets technical mode for l (list) command

              Type  of  archive  (7z,  zip,  gzip,  bzip2 or tar. 7z format is

              Create volumes

              Update options

              Set Working directory

              Exclude filenames

       -y     Assume Yes on all queries


       7-Zip returns the following exit codes:

              0      Normal (no errors or warnings detected)

              1      Warning (Non fatal error(s)).  For  example,  some  files
                     cannot  be  read  during  compressing.  So  they were not

              2      Fatal error

              7      Bad command line parameters

              8      Not enough memory for operation

              255    User stopped the process with control-C (or similar)

Backup and limitations

       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
        - 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")


       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

              lzma method

       -mx=9  level of compression = 9 (Ultra)

              number of fast bytes for LZMA = 64

              dictionary size = 32 megabytes

       -ms=on solid archive = on


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


       7za a -mhe=on -pmy_password archive.7z a_directory
              add  all  files  from  directory  "a_directory"  to  the archive
              "archive.7z" (with data and header archive encryption on)


       7z(1), 7zr(1), bzip2(1), gzip(1), zip(1)

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       Written for Debian by Mohammed Adnene Trojette.