Linux From Scratch - Version 12.2

Chapter 8. Installing Basic System Software

8.7. Bzip2-1.0.8

The Bzip2 package contains programs for compressing and decompressing files. Compressing text files with bzip2 yields a much better compression percentage than with the traditional gzip.

Approximate build time: less than 0.1 SBU
Required disk space: 7.2 MB

8.7.1. Installation of Bzip2

Apply a patch that will install the documentation for this package: 

patch -Np1 -i ../bzip2-1.0.8-install_docs-1.patch

The following command ensures installation of symbolic links are relative: 

sed -i 's@\(ln -s -f \)$(PREFIX)/bin/@\1@' Makefile

Ensure the man pages are installed into the correct location: 

sed -i "s@(PREFIX)/man@(PREFIX)/share/man@g" Makefile

Prepare Bzip2 for compilation with: 

make -f Makefile-libbz2_so
make clean

The meaning of the make parameter:

-f Makefile-libbz2_so

This will cause Bzip2 to be built using a different Makefile file, in this case the Makefile-libbz2_so file, which creates a dynamic libbz2.so library and links the Bzip2 utilities against it.

Compile and test the package: 

make

Install the programs: 

make PREFIX=/usr install

Install the shared library: 

cp -av libbz2.so.* /usr/lib
ln -sv libbz2.so.1.0.8 /usr/lib/libbz2.so

Install the shared bzip2 binary into the /usr/bin directory, and replace two copies of bzip2 with symlinks: 

cp -v bzip2-shared /usr/bin/bzip2
for i in /usr/bin/{bzcat,bunzip2}; do
  ln -sfv bzip2 $i
done

Remove a useless static library: 

rm -fv /usr/lib/libbz2.a

8.7.2. Contents of Bzip2

Installed programs: bunzip2 (link to bzip2), bzcat (link to bzip2), bzcmp (link to bzdiff), bzdiff, bzegrep (link to bzgrep), bzfgrep (link to bzgrep), bzgrep, bzip2, bzip2recover, bzless (link to bzmore), and bzmore
Installed libraries: libbz2.so
Installed directory: /usr/share/doc/bzip2-1.0.8

Short Descriptions

bunzip2

Decompresses bzipped files

bzcat

Decompresses to standard output

bzcmp

Runs cmp on bzipped files

bzdiff

Runs diff on bzipped files

bzegrep

Runs egrep on bzipped files

bzfgrep

Runs fgrep on bzipped files

bzgrep

Runs grep on bzipped files

bzip2

Compresses files using the Burrows-Wheeler block sorting text compression algorithm with Huffman coding; the compression rate is better than that achieved by more conventional compressors using “Lempel-Ziv” algorithms, like gzip

bzip2recover

Tries to recover data from damaged bzipped files

bzless

Runs less on bzipped files

bzmore

Runs more on bzipped files

libbz2

The library implementing lossless, block-sorting data compression, using the Burrows-Wheeler algorithm