tlpkg/doc/tlinst-BT08.tex: revised.

git-svn-id: svn://tug.org/texlive/trunk@7194 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 54 insertions, 18 deletions

diff --git a/Master/tlpkg/doc/tlinst-BT08.tex b/Master/tlpkg/doc/tlinst-BT08.tex
index ae7c78044f6..dbfc433cd09 100644
--- a/Master/tlpkg/doc/tlinst-BT08.tex
+++ b/Master/tlpkg/doc/tlinst-BT08.tex
@@ -105,23 +105,61 @@
 
 \section{What's new?}
 
+\subsection{Multiplatform Installations}
+It had always been possible to install \tl\ on a UNIX server and mount
+the \tl\ directory on many platforms.  On Windows there had been some
+restrictions.  Since \tl\ for Windows had been regarded as a
+single-user system in the past, *|-sys|-Programs like |fmtutil-sys| or
+|updmap-sys| had not been provided.  Thus, it was necessary to provide
+a separate |texmf.cnf| file for Windows.
+
+The *|-sys| programs could be implemented easily in |texlua|.  There
+are several reasons to use |texlua| for this purpose:
+\begin{itemize}
+\item |texlua| is a scripting language and therefore the programs are
+  platform independent and much easier to maintain than C programs.
+\item |texlua| has \kpse\ compiled in.  In a |texlua| script the
+  location of a particular file can be determined very fast.
+\item |texlua| is a small, simple but very powerful programming
+  language.  Its simplicity makes the code easy to maintain.  
+\end{itemize}
+
+In order to allow to use the same |texmf.cnf| for all platforms, Karl
+Berry implemented tilde expansion to \kpse.  That means that the entry
+\begin{verbatim}
+  ~/texmf
+\end{verbatim}
+in |texmf.cnf| expands to
+\begin{verbatim}
+  $HOME/texmf
+\end{verbatim}
+on UNIX, but to
+\begin{verbatim}
+  %USERPROFILE%\texmf
+\end{verbatim}
+on Windows.
+
 \subsection{Install \tl\ from the Internet}
-The new \tl\ infrastructure allows for installations from a remote
-server.  Actually, there is no big difference between extracting a
-compressed file from a CD or to download it first and then extract it.
+It is now possible to install \tl\ from a remote server.  Thanks to
+the new infrastructure, the package database which is needed by the
+installer in order to determine which packages have to be downloaded
+and how to install them is a single file.  
+
+Two installers for network downloads are provided.
+|install-tl.tar.gz.| supports UNIX only.  |install-tl.zip|
+additionally contains a tiny subset of \pl\ for Windows which is
+required to bootstrap the system.  The latter works on all platforms
+supported by \tl.  The sole reason for providing a separate package
+for UNIX is its significantly smaller size.
 
-\subsection{Multiplatform Installations}
-It had been possible to install \tl\ on a UNIX server and mount the
-\tl\ directory on many platforms.  Now, this should work for Wondows
-too.
 
-\subsection{New compression Algorithm}
-Using |lzma| compression instead of |zip| reduces the size of the
+\subsection{A new compression Algorithm}
+Using |.tar.lzma| compression instead of |.zip| reduces the size of the
 compressed packages by 20\%.  It cannot be assumed that |lzma|
-decompressors are available on any platform.  Fortunately there is a
+decompressors are available on any platform, hence they have to be
+provided for all platforms supported by \tl\.  Fortunately there is a
 program `|lzmadec|' available for all platforms.  The size of the
-executable file is only 12\,kB.
-
+executable file is only 12\,kB. 
 
 \subsection{Perl and Ghostscript}
 Though it can be assumed that \pl\ and \gs\ are installed on every
@@ -131,10 +169,10 @@ avoid conflicts with instances of these programs already installed.
 
 A better solution is to hide these programs and make them visible only
 to the scripts which need them.  This is done by wrapper scripts
-written in \tlu\footnote{\tlu\ is Lua\TeX without \TeX}.  The purpose
-of these scripts is to start another program in a changed environment,
-and \tlu\ turned out to be the ultimate programming language for such
-wrappers because it has \kpse\ built in.
+written in \tlu The purpose of these scripts is to start another
+program in a changed environment, and \tlu\ turned out to be the
+ultimate programming language for such wrappers because it has \kpse\
+built in.
 
 The most important batch files provided by \gs\ had been ported to
 \tlu\ too.
@@ -145,5 +183,3 @@ The most important batch files provided by \gs\ had been ported to
 %\end{article}
 
 \end{document}
-
-