  Bzip2 mini-HOWTO
  David Fetter, david@fetter.org <mailto:david@fetter.org>
  v2.00, 22 August 1999

    ο  α׷ bzip2  ϴ ̾߱Ѵ.
   Ʈ <Bzip2-HOWTO.sgml> sgml īǰ ְ, ׸
  " ִ" sgml <http://fetter.org/Bzip2-HOWTO/> ִ.
  ______________________________________________________________________

  


  1. Ұ

     1.1 (BF
        1.1.1 v2.00
        1.1.2 v1.92
        1.1.3 v1.91
        1.1.4 v1.9
        1.1.5 v1.8
        1.1.6 v1.7
        1.1.7 v1.6
        1.1.8 v1.5
        1.1.9 v1.4
        1.1.10 v1.3
        1.1.11 v1.2
        1.1.12 v1.1
        1.1.13 v1.0

  2. Bzip2 

     2.1   bzip2-HOWTO
     2.2 ϵ  bzip2 ̳ʸ 
     2.3 Bzip2 ҽ 
     2.4  ǻͷ bzip2 ϱ

  3. Bzip2   ϱ

  4. Bzip2 tar  

     4.1 ġϴ   :
     4.2 ġϴ Ͱ ϰ ° , root Ư ʿ ʴ:
     4.3 °  , ׷ Ʈ  ʿ.

  5. Bzip2 less  

  6. Bzip2 emacs  

     6.1 θ  emacs ٲٱ:
     6.2    emacs ٲٱ:

  7. Bzip2 wu-ftpd  

  8. Bzip2 grep  

  9. Bzip2 X Netscape  .

  10. Bzip2 ٸ   ٽ ϱ

  ______________________________________________________________________

  1.  Ұ

  Bzip2 ڷḦ ϱ   ο ˰̴. Ϲ gzip
   ũ 60-70%  .


     bzip2 Ͽ Ϲ ø̼ ̿ϰ  
  .


    ̷  libbzip2 ø̼, bzip2  Julian 
  Seward <mailto:Julian_Seward@muraroa.demon.co.uk>  ģ  bzip2 
  C ̺귯  ̴. Bzip2 ޴ <http://www.bzip2.org/bzip2
  /docs/manual_toc.html> ã  ִ ̺귯   
   ߰Ǿ.


    ̷  Ƹ  bzip2  Ŀο ϴ
  (׸ )  ؼ    ̴.


  1.1.   

  1.1.1.  v2.00

  ``Bzip2 less  ϱ'' ι Ǿ ׷ .tar.bzip2 
     ִ.  Ϳ  Nicola Fabiano <mailto:mc8
  644@mclink.it>  Ѵ.

  buzzit ƿƼ ŵǾ.

  tar  ŵǾ.


  1.1.2.  v1.92

  ``Bzip2 ̳ʸ '' ι Ǿ, S.u.S.E. ߰  
  Ѵ.


  1.1.3.  v1.91

  Ÿ Ǿ ``Bzip2 tar   ι''  ǥ 
  θ ϰ ߴ.   ͵鿡  Alessandro Rubini Ѵ.


   bzip2 ͸  ʱ  buzzit  ߴ.


  Zgrep  bgrep ߰Ǿ.


  1.1.4.  v1.9

  Gcc 2.7.*  ϰ ߴ. ̰  Ulrik Dickow 
  .



  Leonard Jean-Marc Ǹ tar  ϴ  ߰Ǿ.


  Linux Akerlund   ߰Ǿ.

  Arnaud Launay  wu-ftpd ι ƴ.


  ׵ ڽ ι Ű.


  1.1.5.  v1.8

  Buzzit װ͵ Ѱ sgml tar.diff ־.  
  ߴ.  Arnaud Launay  縦     
  Ѵ. :-)


     ο  xv Ʈ ߴ.


    ̷    ߰ߴ.


  1.1.6.  v1.7

  Buzzit ƿƼ ߰Ǿ.  Gnu tar  ġ ƴ.


  1.1.7.  v1.6

  Added TenThumbs' Netscape enabler.


     lesspipe.sh ߴ.  ݺ Ǹϰ ۵
  ̴.


  1.1.8.  v1.5

  Arnaud Launay  , ׸  wu-ftpd  ߰Ǿ.


  1.1.9.  v1.4

  Tetsu Isaji Ϻ  ߰Ǿ.


  1.1.10.  v1.3

  Ulrik Dickow 19.30    .emacs ߰Ǿ.


  (   emacs jka-compr.elġ Ǿ. ̷!
  Bzip2 Ⱑ (?) .)


  1.1.11.  v1.2

  Emacs ġ Ǿ ڵ .bz2 ϵ νѴ.


  1.1.12.  v1.1

  Emacs ġ ߰Ǿ.


  1.1.13.  v1.0

   1.

  2.  Bzip2 

  Bzip2 Ȩ  Ȩ Ʈ <http://www.bzip2.org/>.
  ̱ ̷Ʈ <http://www.digistar.com/bzip2/index.html>.


  2.1.    bzip2-HOWTO

  ε Ƹ Arnaud Launay   ϱ⸦ ٶ ̴.
    <http://www.freenix.fr/linux/HOWTO/mini/Bzip2.html>, ׸
  ftp <ftp://ftp.lip6.fr/pub/linux/french/docs/HOWTO/mini/Bzip2.gz>
  Arnaud ڸϷ   ִ.  ּҴ <mailto:zoro@mygale.org>


  Ϻε Ƹ Tetsu Isaji Ϻ  ϱ⸦ ٶ ̴.
  <http://jf.gee.kyoto-u.ac.jp/JF/JF.html>.  Isaji Ȩ <http://ww
  w2s.biglobe.ne.jp/~kaien/> Ҽ ְ, Ȥ ڸϷ Ҽִ.
  <mailto:isaji@mxu.meshnet.or.jp>


  ε Ƹ Linus Akerlund   ϱ⸦ ٶ 
   <http://user.tninet.se/~uxm165t/linux_doc.html>.  Linus ڸ
   Ҽ ִ. <mailto:uxm165t@tninet.se>


  2.2.  ϵ  bzip2 ̳ʸ 

  Ȩ Ʈ .


  2.3.  bzip2 ҽ 

  װ͵  Ʈκ Դ (``Bzip2 '' .


  2.4.   ǻͷ bzip2 ϱ

    gcc 2.7.*  ,   ٲ


       CFLAGS = -O3 -fomit-frame-pointer -funroll-loops

  


       CFLAGS = -O2 -fomit-frame-pointer

  -O3  -O2 ٲٰ -funroll-loops ִ´. Ŀ Ҷ  
    -m* ÷׸(, -m486) ߰ϱ  ̴.

  -funroll-loops ϴ   ߿ κ̰, gcc 2.7 ߸ 
  带 ϴ   ǰ, gcc 2.7 ڵ尡    Ŀ
  ̴.  ٸ Ϸ (lcc, egcs, gcc 2.8.x)  Ʈ CFLAGS
   .

   , README ٷ װ  ġض.


  3.  Bzip2   ϱ

   ޴  о :)


  4.  Bzip2 tar  .

  ٲپ ϸ bzip2 tar     ؿ Ʈ ȴ.

  4.1.  ġϴ°  :

     ġ ʿ ʴ.  To un-tar the bzip2'd tar
  archive, foo.tar.bz2 in the current directory, do


       /path/to/bzip2 -cd foo.tar.bz2 | tar xf -

  Ǵ


       tar --use-compress-prog=bzip2 xf foo.tar.bz2

   , ׷ but can be a PITA to type often.


  4.2.  ġϴ  , ϰ ϴ° , root Ư ʿ ʴ:

    Leonard Jean-Marc <mailto:leonard@sct1.is.belgacom.be>
  Ѵ.  csh bash   Ϳ  Alessandro Rubini
  <mailto:rubini@morgana.systemy.it>   Ѵ.


   .bashrc, ̰Ͱ   ־:


       alias btar='tar --use-compress-program /usr/local/bin/bzip2 '

   .tcshrc, Ǵ .cshrc, ̰Ͱ ϰ ̴ :


       alias btar 'tar --use-compress-program /usr/local/bin/bzip2'

  4.3.  °  , ׷ Ʈ  ʿ.

   tar GNU  ο  ض,  1.13.10̴.
  װ GNU ftp Ʈ <ftp://alpha.gnu.org/gnu/tar/> ã  ִ 
   ̷.
  5.  Bzip2 less  

  To uncompress bzip2'd files on the fly, i.e. to be able to use "less"
  on them without first bunzip2'ing them, you can make a lesspipe.sh
  (man less) like this:

  #!/bin/sh
  # This is a preprocessor for 'less'.  It is used when this environment
  # variable is set:   LESSOPEN="|lesspipe.sh %s"

    case "$1" in
    *.tar) tar tvvf $1 2>/dev/null ;; # View contents of various tar'd files
    *.tgz) tar tzvvf $1 2>/dev/null ;;
  # This one work for the unmodified version of tar:
    *.tar.bz2) bzip2 -cd $1 $1 2>/dev/null | tar tvvf - ;;
  #This one works with the patched version of tar:
  # *.tar.bz2) tyvvf $1 2>/dev/null ;;
    *.tar.gz) tar tzvvf $1 2>/dev/null ;;
    *.tar.Z) tar tzvvf $1 2>/dev/null ;;
    *.tar.z) tar tzvvf $1 2>/dev/null ;;
    *.bz2) bzip2 -dc $1  2>/dev/null ;; # View compressed files correctly
    *.Z) gzip -dc $1  2>/dev/null ;;
    *.z) gzip -dc $1  2>/dev/null ;;
    *.gz) gzip -dc $1  2>/dev/null ;;
    *.zip) unzip -l $1 2>/dev/null ;;
    *.1|*.2|*.3|*.4|*.5|*.6|*.7|*.8|*.9|*.n|*.man) FILE=`file -L $1` ; # groff src
      FILE=`echo $FILE | cut -d ' ' -f 2`
      if [ "$FILE" = "troff" ]; then
        groff -s -p -t -e -Tascii -mandoc $1
      fi ;;
    *) cat $1 2>/dev/null ;;
  #  *) FILE=`file -L $1` ; # Check to see if binary, if so -- view with 'strings'
  #    FILE1=`echo $FILE | cut -d ' ' -f 2`
  #    FILE2=`echo $FILE | cut -d ' ' -f 3`
  #    if [ "$FILE1" = "Linux/i386" -o "$FILE2" = "Linux/i386" \
  #         -o "$FILE1" = "ELF" -o "$FILE2" = "ELF" ]; then
  #      strings $1
  #    fi ;;
    esac

  6.  Bzip2 emacs  

  6.1.  θ  emacs ٲٱ:

   ڵ带 ߰ jka-compr.elġ  .

  μ:  emacs-20.0 ׽Ʈ غô, ׷ ٸ  
  ϰ  Ѵٰ   .

    ,

  1. emacs-20.2/lisp ҽ 丮  (wherever you untarred it)

  2. jka-compr.el.diffθ  Ʒ ġ ƶ  (   
   ܵ ־Ѵ ;).

  3. ض

   patch < jka-compr.el.diff

  4. emacs ض, ׸ ض


        M-x byte-compile-file jka-compr.el

  5. emacs ض.

  6.   jka-compr.elc  ̽   Űܶ.

  7. ο jka-compr.elc   ٲ.

  8. ܶ!


     --- jka-compr.el        Sat Jul 26 17:02:39 1997
     +++ jka-compr.el.new    Thu Feb  5 17:44:35 1998
     @@ -44,7 +44,7 @@
      ;; The variable, jka-compr-compression-info-list can be used to
      ;; customize jka-compr to work with other compression programs.
      ;; The default value of this variable allows jka-compr to work with
     -;; Unix compress and gzip.
     +;; Unix compress and gzip.  David Fetter added bzip2 support :)
      ;;
      ;; If you are concerned about the stderr output of gzip and other
      ;; compression/decompression programs showing up in your buffers, you
     @@ -121,7 +121,9 @@


      ;;; I have this defined so that .Z files are assumed to be in unix
     -;;; compress format; and .gz files, in gzip format.
     +;;; compress format; and .gz files, in gzip format, and .bz2 files,
     +;;; in the snappy new bzip2 format from http://www.muraroa.demon.co.uk.
     +;;; Keep up the good work, people!
      (defcustom jka-compr-compression-info-list
        ;;[regexp
        ;; compr-message  compr-prog  compr-args
     @@ -131,6 +133,10 @@
           "compressing"    "compress"     ("-c")
           "uncompressing"  "uncompress"   ("-c")
           nil t]
     +    ["\\.bz2\\'"
     +     "bzip2ing"        "bzip2"         ("")
     +     "bunzip2ing"      "bzip2"         ("-d")
     +     nil t]
          ["\\.tgz\\'"
           "zipping"        "gzip"         ("-c" "-q")
           "unzipping"      "gzip"         ("-c" "-q" "-d")

  6.2.     emacs ٲٱ:

  Thanks for this one go to Ulrik Dickow, ukd@kampsax.dk
  <mailto:ukdATkampsax.dk>, Kampsax Technology ִ ý α׷:

   ý۰ڰ ƴҶ װ  bzip2 ڵ   ִ.
  ,   .emacs ϴ  ߰ض.
  ;; Automatic (un)compression on loading/saving files (gzip(1) and similar)
  ;; We start it in the off state, so that bzip2(1) support can be added.
  ;; Code thrown together by Ulrik Dickow for ~/.emacs with Emacs 19.34.
  ;; Should work with many older and newer Emacsen too.  No warranty though.
  ;;
  (if (fboundp 'auto-compression-mode) ; Emacs 19.30+
      (auto-compression-mode 0)
    (require 'jka-compr)
    (toggle-auto-compression 0))
  ;; Now add bzip2 support and turn auto compression back on.
  (add-to-list 'jka-compr-compression-info-list
               ["\\.bz2\\(~\\|\\.~[0-9]+~\\)?\\'"
                "zipping"        "bzip2"         ()
                "unzipping"      "bzip2"         ("-d")
                nil t])
  (toggle-auto-compression 1 t)

  7.  Bzip2 wu-ftpd  

  Arnaud Launay  bandwidth ̹  Ѵ. The following
  should go in /etc/ftpconversions to do on-the-fly compressions and
  decompressions with bzip2. Make sure that the paths (like
  /bin/compress) are right.


   :.Z:  :  :/bin/compress -d -c %s:T_REG|T_ASCII:O_UNCOMPRESS:UNCOMPRESS
   :   : :.Z:/bin/compress -c %s:T_REG:O_COMPRESS:COMPRESS
   :.gz: :  :/bin/gzip -cd %s:T_REG|T_ASCII:O_UNCOMPRESS:GUNZIP
   :   : :.gz:/bin/gzip -9 -c %s:T_REG:O_COMPRESS:GZIP
   :.bz2: :  :/bin/bzip2 -cd %s:T_REG|T_ASCII:O_UNCOMPRESS:BUNZIP2
   :   : :.bz2:/bin/bzip2 -9 -c %s:T_REG:O_COMPRESS:BZIP2
   :   : :.tar:/bin/tar -c -f - %s:T_REG|T_DIR:O_TAR:TAR
   :   : :.tar.Z:/bin/tar -c -Z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+COMPRESS
   :   : :.tar.gz:/bin/tar -c -z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+GZIP
   :   : :.tar.bz2:/bin/tar -c -y -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+BZIP2

  8.  Bzip2 grep  

  The following utility, which I call bgrep, is a slight modification of
  the zgrep which comes with Linux.  You can use it to grep through
  files without bunzip2'ing them first.

  #!/bin/sh

  # bgrep -- a wrapper around a grep program that decompresses files as needed
  PATH="/usr/bin:$PATH"; export PATH

  prog=`echo $0 | sed 's|.*/||'`
  case "$prog" in
          *egrep) grep=${EGREP-egrep}     ;;
          *fgrep) grep=${FGREP-fgrep}     ;;
          *)      grep=${GREP-grep}       ;;
  esac
  pat=""
  while test $# -ne 0; do
    case "$1" in
    -e | -f) opt="$opt $1"; shift; pat="$1"
             if test "$grep" = grep; then  # grep is buggy with -e on SVR4
               grep=egrep
             fi;;
    -*)      opt="$opt $1";;
     *)      if test -z "$pat"; then
               pat="$1"
             else
               break;
             fi;;
    esac
    shift
  done

  if test -z "$pat"; then
    echo "grep through bzip2 files"
    echo "usage: $prog [grep_options] pattern [files]"
    exit 1
  fi

  list=0
  silent=0
  op=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
  case "$op" in
    *l*) list=1
  esac
  case "$op" in
    *h*) silent=1
  esac

  if test $# -eq 0; then
    bzip2 -cd | $grep $opt "$pat"
    exit $?
  fi

  res=0
  for i do
    if test $list -eq 1; then
      bzip2 -cdfq "$i" | $grep $opt "$pat" > /dev/null && echo $i
      r=$?
    elif test $# -eq 1 -o $silent -eq 1; then
      bzip2 -cd "$i" | $grep $opt "$pat"
      r=$?
    else
      bzip2 -cd "$i" | $grep $opt "$pat" | sed "s|^|${i}:|"
      r=$?
    fi
    test "$r" -ne 0 && res="$r"
  done
  exit $res


  9.  Bzip2 X Netscape  .

  tenthumbs@cybernex.net says:


       I also found a way to get Linux Netscape to use bzip2 for Content-
       Encoding just as it uses gzip. Add this to $HOME/.Xdefaults or
       $HOME/.Xresources

       I use the -s option because I would rather trade some decompressing
       speed for RAM usage. You can leave the option out if you want to.

  Netscape*encodingFilters:      \
          x-compress :  : .Z     : uncompress -c  \n\
          compress   :  : .Z     : uncompress -c  \n\
          x-gzip     :  : .z,.gz : gzip -cdq      \n\
          gzip       :  : .z,.gz : gzip -cdq      \n\
          x-bzip2    :  : .bz2   : bzip2 -ds \n

  10.  Bzip2 ٸ   ٽ ϱ

  The following perl program takes files compressed in other formats
  (.tar.gz, .tgz. .tar.Z, and .Z for this iteration) and repacks them
  for better compression.  The perl source has all kinds of neat
  documentation on what it does and how it does what it does.  This
  latest version takes files as input on the command line.  Without
  command line arguments, it tries to repack every file in the current
  working directory.

  #!/usr/bin/perl -w

  #######################################################
  #                                                     #
  # This program takes compressed and gzipped programs  #
  # in the current directory and turns them into bzip2  #
  # format.  It handles the .tgz extension in a         #
  # reasonable way, producing a .tar.bz2 file.          #
  #                                                     #
  #######################################################
  $counter = 0;
  $saved_bytes = 0;
  $totals_file = '/tmp/machine_bzip2_total';
  $machine_bzip2_total = 0;

  @raw = (defined @ARGV)?@ARGV:<*>;

  foreach(@raw) {
      next if /^bzip/;
      next unless /\.(tgz|gz|Z)$/;
      push @files, $_;
  }
  $total = scalar(@files);

  foreach (@files) {
      if (/tgz$/) {
          ($new=$_) =~ s/tgz$/tar.bz2/;
      } else {
          ($new=$_) =~ s/\.g?z$/.bz2/i;
      }
      $orig_size = (stat $_)[7];
      ++$counter;
      print "Repacking $_ ($counter/$total)...\n";
      if ((system "gzip -cd $_ |bzip2 >$new") == 0) {
          $new_size = (stat $new)[7];
          $factor = int(100*$new_size/$orig_size+.5);
          $saved_bytes += $orig_size-$new_size;
          print "$new is about $factor% of the size of $_. :",($factor<100)?')':'(',"\n";
          unlink $_;
      } else {
          print "Arrgghh!  Something happened to $_: $!\n";
      }
  }
  print "You've "
      , ($saved_bytes>=0)?"saved ":"lost "
      , abs($saved_bytes)
      , " bytes of storage space :"
      , ($saved_bytes>=0)?")":"("
      , "\n"
      ;

  unless (-e '/tmp/machine_bzip2_total') {
      system ('echo "0" >/tmp/machine_bzip2_total');
      system ('chmod', '0666', '/tmp/machine_bzip2_total');
  }


  chomp($machine_bzip2_total = `cat $totals_file`);
  open TOTAL, ">$totals_file"
       or die "Can't open system-wide total: $!";
  $machine_bzip2_total += $saved_bytes;
  print TOTAL $machine_bzip2_total;
  close TOTAL;

  print "That's a machine-wide total of ",`cat $totals_file`," bytes saved.\n";

