Software Installation in Java

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4.5 Software Installation
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With the notable exception of the GNU/Linux operating system, most standard operating system installations will not leave us in possession of an immediately usable system. We also need to install third-party software in order to get useful work out of the host. Software installation is a very similar problem to that of operating system installation after all, the operating system is software. However, third party software originates from a different source than the operating system. It is often bound by license agreements, and it needs to be distributed around the network. Some software has to be compiled from source. We therefore need a thoughtful strategy for dealing with software. Specialized schemes for software installation were discussed in refs. [62, 168], and a POSIX draft was discussed in ref. [12], though little seems to have come of it. 4.5.1 Free and Proprietary Software
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Unlike other popular operating systems, Unix grew up around people who write their own software rather than relying on off-the-shelf products. The Internet contains gigabytes of
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software for Unix systems which costs nothing. Large companies like the oil industry and newspapers can afford off-the-shelf software for Unix, but most people can't. There are therefore two kinds of software installation: the installation of software from binaries, and the installation of software from source. Commercial software is usually installed from a CD by running an installation program and following the instructions carefully; the only decision we need to make is where we want to install the software. Free software and Open Source software usually comes in an source form and must therefore be compiled. Unix programmers have gone to great lengths to make this process as simple as possible for system administrators. 4.5.2 Structuring Software
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The first step in installing software is to decide where we want to keep it. We could, naturally, locate software anywhere we like, but consider the following: Software should be separated from the operating system's installed files, so that the OS can be reinstalled or upgraded without ruining a software installation. Unix-like operating systems have a naming convention. Compiled software can be collected in a special area, with a bin directory and a lib directory so that binaries and libraries conform to the usual Unix conventions. This makes the system consistent and easy to understand. It also keeps the program search PATH variable simple. Home-grown files and programs which are special to our own particular site can be kept separate from files which could be used anywhere. In that way, we define clearly the validity of the files and we see who is responsible for maintaining them.
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The directory traditionally chosen for installed software is called /usr/local. One then makes sub-directories /usr/local/bin and /usr/local/lib and so on [119]. Unix has a de facto naming standard for directories which we should try to stick to as far as reason permits, so that others will understand how our system is built up: bin Binaries or executables for normal user programs. sbin Binaries or executables for programs which only system administrators require. Those files in /sb in are often statically linked to avoid problems with libraries which lie on unmounted disks during system booting. lib Libraries and support files for special software. etc Configuration files. share Files which might be shared by several programs or hosts. For instance, databases or help information; other common resources.
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One suggestion for structuring installed software is shown in Figure 4.1. Another is shown in Figure 4.2. Here we divide these into three categories: regular installed software, GNU software (i.e. free software) and site-software. The division is fairly arbitrary. The reason for this is as follows: / u s r / l o c a l i s the traditional place for software which does not belong to the OS. We could keep everything here, but we will end up installing a lot of software after a while, so it is useful to create two other sub-categories.
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