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Full Discussion: Clueless re Java: /opt vs. /usr/local
Operating Systems Linux Fedora Clueless re Java: /opt vs. /usr/local Post 302879786 by bakunin on Sunday 15th of December 2013 10:16:04 AM
Old 12-15-2013
The debate about "/opt" versus "/usr/local" boils down to the following:

In Unix the layout of the filesystem is more or less fixed. Every file, executable or not, should have its designated place where it has to go. This only as an afore.

The Linux initiative came up with an attempt to further codify this already long-used "best practice" and published the "Filesystem Hierarchy Standard".

I won't comment on the other parts of the document, just the part dealing with "/usr/local" and "/opt":

"/opt" is where all application should go. For every application there should be a subdirectory with its name (and optionally manufacturer) and in that a directory with its version. The "foo" application of the "bar" company in version 1.23 would go to "/opt/bar/foo/1.23", for instance. The executables for this software should be in "/opt/bar/foo/1.23/bin" with optional links to "/opt/bin" to avoid a convoluted PATH.

"/usr/local" is the place for all the OS extensions the administrator wants to have at this particular system. As "/usr" (short for "Unix Software Resources") is under the sole discretion of the OS provider this is the only place that should be modifyable by the SysAdmin. Still, this should be limited to OS-relevant utilities, not for applications in their own right. You might place a third-party "ssh"-client there or "gzip", but not, for instance, "MySQL".

Having said that: if you put java into "/usr/local" or into "/opt" is a question of if you see it as an application in its own right or merely a system tool. There is no "correct" answer to that, just your sensible decision about what best describes its usage on your system.

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

libglpk-java

libglpk-java(3) 					       libglpk-java overview						   libglpk-java(3)

NAME

       libglpk-java - GNU Linear Programming Kit Java Binding

DESCRIPTION

       The  GNU  Linear  Programming  Kit  (GLPK)  package supplies a solver for large scale linear programming (LP) and mixed integer programming
       (MIP).  The GLPK project is hosted at http://www.gnu.org/software/glpk.

       It has two mailing lists:
       - help-glpk@gnu.org and
       - bug-glpk@gnu.org.

       To subscribe to one of these lists, please, send an empty mail with a Subject: header line of just "subscribe" to the list.

       GLPK provides a library written in C and a standalone solver.  The source code provided at ftp://gnu.ftp.org/gnu/glpk/ contains	the  docu-
       mentation of the library in file doc/glpk.pdf.

       The Java platform provides the Java Native Interface (JNI) to integrate non-Java language libraries into Java applications.

       Project GLPK for Java delivers a Java Binding for GLPK. It is hosted at http://glpk-java.sourceforge.net/.

       To report problems and suggestions concerning GLPK for Java, please, send an email to the author at xypron.glpk@gmx.de.

ARCHITECTURE

       A GLPK for Java application will consist of the following
       - the GLPK library
       - the GLPK for Java JNI library
       - the GLPK for Java class library
       - the application code.

GLPK LIBRARY

       The GLPK library can be compiled from source code. Follow the instructions in file INSTALL provided in the source distribution. Precompiled
       packages are available in many Linux distributions.

       The usual installation path for the library is /usr/local/lib/libglpk.so.  The library has to be in the search path for binaries.

GLPK FOR JAVA JNI LIBRARY

       The GLPK for Java JNI library can be compiled from source code. Follow the instructions in file INSTALL provided in  the  source  distribu-
       tion.

       The  usual installation path for the library is /usr/local/lib/jni/libglpk-java.so.  The library has to be in the search path for binaries.
       Specify the library path upon invocation of the application, e.g.
       java -Djava.library.path=/usr/local/libjni

GLPK FOR JAVA CLASS LIBRARY

       The source code to compile the GLPK for Java class library is provided at http://glpk-java.sourceforge.net.

       The GLPK for Java class library can be compiled from source code. Follow the instructions in file INSTALL provided in the source  distribu-
       tion.  The usual installation path for the library is /usr/local/share/java/glpk-java.jar.

       The library has to be in the CLASSPATH. Specify the classpath upon invocation of the application, e.g.
       java -classpath /usr/local/share/java/glpk-java.jar;.

SEE ALSO

       Further documentation and examples can be found in the documentation path, which defaults to /usr/local/share/doc/libglpk-java.

version 1.0.18						       September 10th, 2011						   libglpk-java(3)
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