bzip2.txt

linux-bible.rar linux-bible.rar

  *.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 sr
c
    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. 使用 bzip2 来结合 emacs

6.1 为每个人改变 emacs:

   我写了下面的给 jka-compr.el 用的修补，它会加入 bzip2 成为自动压缩模式。
   
   除外条款: 我只在 emacs-20.2上试过这个，但是我也找不到有 啥麽理由来相信
   同样的方法却不能在其他版本上使用的。
   
   使用它，
    1. 到 emacs-20.2/lisp 原始程式码目录□ (看你在哪儿 untarred 它的)
    2. 把下面的修补做成叫 jka-compr.el.diff 的档案(全放在这档案□ )。
    3. 然後执行
       
 patch < jka-compr.el.diff

    4. 启动 emacs，再执行
       
 M-x byte-compile-file jka-compr.el

    5. 离开 emacs。
    6. 把它原来的 jka-compr.elc 放到安全的地方以防有臭虫时备用。
    7. 用新的 jka-compr.elc来代替它。
    8. 好好玩吧!
       
--- 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 为某人改变 emacs:

   这次要谢谢 Ulrik Dickow, [31][e-mail]，他是Kampsax Technology的系
   统程式设计师 :
   
   为了让非 sysadmin 的朋友可以自动地使用 bzip2，只需在你的 .emacs 档案□
   加上下列东东。
   
;; 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. 用 bzip2 来配合 wu-ftpd

   感谢 Arnaud Launay 这则节省频宽的秘诀。下面的内容应该是放到
   /etc/ftpconversions □面来达成以 bzip2 来做即时压缩及解压缩 。请确认路
   径 (像 /bin/compress) 要正确。
   
 :.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. 使用 bzip2 来配合 grep

   下面的公用程式，我管它叫 bgrep，事实上是把伴随在 Linux 的 zgrep 做个小
   更改 而已。你可以使用它来 grep，而不需先 bunzip2 档案。
   
#!/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 配合 X 下的 Netscape 来使用。

   [e-mail] 说:
   
     我找到一个可以让 Linux Netscape 来使用 bzip2 做为 Content-Encoding
     就如同它使用 gzip 一样。把下面的东东加到 $HOME/.Xdefaults 或是
     $HOME/.Xresources
     
     我使用 -s 选项，是因为选择放弃解压缩的速度来换得 RAM 的占用。 你可以
     把它设成你自己要的。
     
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. 使用 bzip2 来再压缩其他的压缩格式

   下面的 perl 程式会把以下列的压缩格式档 (.tar.gz, .tgz. .tar.Z, 和 .Z
   for this iteration) 重新打包成最佳的压缩值。这 perl 原始程式都有全方位
   的好文件 来说明它做什麽以及它如何办到的。
#!/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;

while(<*[Zz]>) {
    next if /^bzip2-0.1pl2.tar.gz$/;
    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",
      " $saved_bytes bytes of storage space :",
       ($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";

11. 中译本

   译者注: 若您发现本文件内容有翻译不顺畅或错误的地方，请您来信告诉我，以
   做更正，谢谢。 译者电子邮件 [32][e-mail] 或
   [33][e-mail]
   
   译注：这份 HOWTO 文件的中文版可在台湾 Linux 使用者组织下的中文 Linux 文
   件计画 [34]http://www.linux.org.tw/CLDP/
   或是"Linux for Taiwan 台湾人的 Linux "
   [35]http://members.xoom.com/linux4tw/ 下取得。

References

   1. mailto:[e-mail]
   2. mailto:[e-mail]
   3. mailto:[e-mail]
   4. http://members.xoom.com/linux4tw/
   5. file://localhost/tmp/bg5sgmltools.15536/Bzip2-HOWTO.sgml
   6. http://www.best.com/~dfetter/Bzip2-HOWTO/Bzip2-HOWTO.sgml
   7. mailto:[e-mail]
   8. file://localhost/tmp/bg5sgmltools.15536/Bzip2.txt.html#bzip2-binaries
   9. file://localhost/tmp/bg5sgmltools.15536/Bzip2.txt.html#bzip2-with-tar
  10. http://www.muraroa.demon.co.uk/
  11. http://www.digistar.com/bzip2/index.html
  12. ftp://ftp.redhat.com/pub/contrib
  13. http://www.freenix.fr/linux/HOWTO/mini/Bzip2.html
  14. ftp://ftp.lip6.fr/pub/linux/french/docs/HOWTO/mini/Bzip2.gz
  15. mailto:[e-mail]
  16. http://jf.gee.kyoto-u.ac.jp/JF/JF.html
  17. http://www2s.biglobe.ne.jp/~kaien/
  18. mailto:[e-mail]
  19. http://user.tninet.se/~uxm165t/linux_doc.html
  20. mailto:[e-mail]
  21. ftp://ftp.debian.org/debian/dists/stable/main/binary-i386/utils/bzip2_0.1pl2-5.deb
  22. ftp://ftp.redhat.com/pub/redhat/redhat-5.1/alpha/RedHat/RPMS/bzip2-0.1pl2-1.alpha.rpm
  23. ftp://ftp.redhat.com/pub/redhat/redhat-5.1/i386/RedHat/RPMS/bzip2-0.1pl2-1.i386.rpm
  24. ftp://ftp.redhat.com/pub/redhat/redhat-5.1/sparc/RedHat/RPMS/bzip2-0.1pl2-1.sparc.rpm
  25. ftp://www.cdrom.com/pub/linux/slackware-3.5/slakware/a1/bzip2.tgz
  26. ftp://ftp.suse.com/pub/SuSE-Linux/5.2/suse/ap1/bzip.rpm
  27. file://localhost/tmp/bg5sgmltools.15536/Bzip2.txt.html#get-bzip2
  28. ftp://ftp.redhat.com/pub/contrib/SRPMS/bzip2-0.1pl2-1.src.rpm
  29. mailto:[e-mail]
  30. mailto:[e-mail]
  31. mailto:ukdATkampsax.dk
  32. mailto:[e-mail]
  33. mailto:[e-mail]
  34. http://www.linux.org.tw/CLDP/
  35. http://members.xoom.com/linux4tw/