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Full Discussion: Global Script Best Practices
Top Forums Shell Programming and Scripting Global Script Best Practices Post 302694775 by Corona688 on Friday 31st of August 2012 11:34:07 AM
Old 08-31-2012
It comes down to "keep your stuff obviously yours, and obviously separate". UNIX has many options available for doing so; you can take it as far as you like.

You can keep your scripts in /home/myusername/bin/ and add that to your own PATH ( by modifying ~/.profile or whatever equivalent file your shell uses ) so your scripts are available to your own user without typing the absolute path every time. This is easy, safe, secure, and convenient. You enjoy the effects of having a script installed globally without having to actually do so, letting you modify them without elevated permissions, which greatly reduces your chances of making a system-wrecking mistake or causing confusion with other users.

You also could install in /usr/local/sbin/ instead of /usr/sbin/ to keep your files apart from the system's. /usr/local/ is generally empty and reserved for things like this; you may need to add it to your PATH. If you absolutely must install them globally, this is a bare minimum IMHO.

You could also install into /opt/myapplication like large commercial applications frequently do, keeping your files REALLY far apart from the system stuff. This is probably the best option if you have a really big set of interdependent parts that must be system-global yet kept together in one place. Sets of things like this often have big trees of files under /opt/myapplication, with their own set of PATH's and other variables which must be loaded before the app can be used.

If for some reason I really, really must install into /usr/sbin or what have you, what I do is install into /opt/myappdir anyway, and just make /usr/sbin/myapp a symbolic link to /opt/myappdir/myapp. If I need to find and remove everything belonging to myappdir later, I've at least given myself a straightforward way to do so.

You can even put things in a chroot, isolating your stuff hermetically apart from the rest of the system.

For your purposes as a beginner, the very first option is probably the best, easy and safe and useful.

Last edited by Corona688; 08-31-2012 at 12:47 PM..
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RHINO(1)						      General Commands Manual							  RHINO(1)

NAME
rhino - invokes the JavaScript shell for running scripts in batch mode or interactive SYNOPSIS
rhino [options] script_filename_or_url [script_arguments] DESCRIPTION
This manual page documents briefly the rhino command. rhino is a start script for the rhino JavaScript shell which provides a simple way to run scripts in batch mode or an interactive environ- ment for exploratory programming. OPTIONS
-e script_source Executes script_source as a JavaScript script. -f script_filename_or_url Reads script_filename_or_url content and execute it as a JavaScript script. -opt, -O optLevel Optimizes at level optLevel, which must be an integer between 0 and 9. -version versionNumber Specifies the language version to compile with. The string versionNumber must be one of 100, 110, 120, 130, or 140. See JavaScript Language Versions for more information on language versions. PREDEFINED PROPERTIES
Scripts executing in the shell have access to some additional properties of the top-level object. arguments The arguments object is an array containing the strings of all the arguments given at the command line when the shell was invoked. help() Executing the help function will print usage and help messages. defineClass(className) Define an extension using the Java class named with the string argument className. Uses ScriptableObject.defineClass() to define the extension. deserialize(filename) Restore from the specified file an object previously written by a call to serialize. load([filename,...]) Load JavaScript source files named by string arguments. If multiple arguments are given, each file is read in and executed in turn. loadClass(className) Load and execute the class named by the string argument className. The class must be a class that implements the Script interface, as will any script compiled by jsc. print([expr...]) Evaluate and print expressions. Evaluates each expression, converts the result to a string, and prints it. readFile(path[,characterCoding]) Read given file and convert its bytes to a string using the specified character coding or default character coding if explicit cod- ing argument is not given. readUrl(url[,characterCoding]) Open an input connection to the given string url, read all its bytes and convert them to a string using the specified character cod- ing or default character coding if explicit coding argument is not given. runCommand(commandName,[arg,...][options]) Execute the specified command with the given argument and options as a separate process and return the exit status of the process. For details, see JavaDoc for org.mozilla.javascript.tools.shell.Global#runCommand. serialize(object,filename) Serialize the given object to the specified file. spawn(functionOrScript) Run the given function or script in a different thread. sync(function) creates a synchronized function (in the sense of a Java synchronized method) from an existing function. The new function synchro- nizes on the this object of its invocation. quit() Quit shell. The shell will also quit in interactive mode if an end-of-file character is typed at the prompt. version([number]) Get or set JavaScript version number. If no argument is supplied, the current version number is returned. If an argument is sup- plied, it is expected to be one of 100, 110, 120, 130, or 140 to indicate JavaScript version 1.0, 1.1, 1.2, 1.3, or 1.4 respec- tively. SEE ALSO
The online documentation under http://www.mozilla.org/rhino/shell.html <http://www.mozilla.org/rhino/shell.html> AUTHOR
This manual page was written by Wolfgang Baer <WBaer@gmx.de>. February 12, 2005 RHINO(1)
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