Re: New to Linux
From: hiwa (HGA03630_at_nifty.ne.jp)
Date: 01/27/04
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Date: 27 Jan 2004 02:46:48 -0800
Jhuola Hoptire <JH@nothere.com> wrote in message news:<YkmRb.80105$dP1.203357@newsc.telia.net>...
> hiwa wrote:
>
> > Jhuola Hoptire <JH@nothere.com> wrote in message news:<p3eRb.46425$mU6.175355@newsb.telia.net>...
> >
> >>Just installed J2RE 1.4.2 on a Linux server. I am very
> >>knew to the POSIX world.
> >
> > Install J2SE, not J2RE which is a runtime for exising Java
> > applications.
> >
> I'm going to install both. The jre should be
> redundant but I am experimenting with the different
> downloads and installation processes (rpm vs zipped tar).
> Right now, it's more about learning my way around Linux.
> >
> >>I couldn't dig-up much in the docs or via google about
> >>the following:
> >>
> >>1 - Is there a standard way to make sure users (all, or
> >>some) can "reach" java? eg one could presumably create
> >>a java.sh or aliases ... Where is the standard Linux
> >>directory to put such a script (and why)?
> >>In Win32 this is not an issue as a copy of java.exe is put
> >>in a system folder and that folder is in everybody's path
> >>(via the global system path) - not an elegant solution,
> >>but it works.
> >
> > Put java.sh on any directory. Then do cd to the directory and
> > run command:
> >
> > ./java.sh
> >
> > After the install is finished, set PATH and CLASSPATH in the
> > .bash_profile file appropriately:
> >
> That's what I was looking for, thanks. In fact I had used
> /etc/profile for this. The comments in that script seem to
> imply it sets the system wide environment, which is probably
> best for my current purposes.
> > export JAVA_HOME=your-installed-directory
> > export PATH=$PATH:$JAVA_HOME/bin
> > export CLASSPATH=$CLASSPATH:.
> > # .(dot) is current directory
> >
> Why add the '.'? Unless there is some compelling reason
'.' is convenient for quick and dirty work. :)
> (like the Linux installation requires it), IMHO, there is
> no other valid argument for users (probably as developers,
> in this case) expecting their "present working directory"
> (pwd) to be on the CLASSPATH.
> At best it could cause confusion, especially for beginners
> who quite often put all their source code in one folder
> (their pwd) and don't always make proper use of
> "package"ing.
> >
> >>
> >>2 - When developing, where should the project resources,
> >>(ie java source code, design docs etc...) go on Linux
> >>machines? This is not really a java specific question
> >>(ie NOT about how to arrange source code in package
> >>structure etc... which IMHO is the right way to do it),
> >>but more about how to use the Linux file systems,
> >>directory structure and file organisation for single
> >>user and/or shared development projects.
> >
> > You decide them all. For example, make learning_java directory
> > under your $HOME and do everything in it.
> >
> Yes, you are absolutely right that java shouldn't mind.
> I was looking more for some advice on how the Linux
> directories are *conventionally* used, especially in
> this type of context.
> An example of the conventions for "correct" usage of Linux
> directories; after I installed java, I read that /usr/ is
> only supposed to be for apps added during the Linux
> installation. However, Sun have decided to stick
> the java installation there too.
Never mind. You don't have to care.
> I was wondering how development files should be organised
> relative to Linux core directories to be in the spirit of
> "the Linux way".
/usr/local and/or server spcific dir might be the nearest to
"the Linux way".
> >
> >>3 - Does anyone have links for any resources aimed at
> >>experienced java folk who are new to developing/running
> >>java on Linux and Unix (coming from Win32 or other)?
> >
> > No difference Java per se betw Win and Lin. For the system
> > environment, amass your own experience. There are many good
> > docs and books for Linux out there.
> >
> Yes, I agree the java should be close to identical. I was
> thinking in terms of quirks (or advantages) with the
There are a few but all of them should be minor.
> Linux JVM in terms of performance, synchronisation, memory,
> cpu, I/O usage etc ...
> >
> >>4 - What's the best way to download the latest Linux
> >>java distros from Sun if there is no GUI running (and
> >>no browser) on your plain Linux server? Sun has stopped
> >>offering ftp downloads.
> >
> > Use GNU wget command, or w3m program. There are many such programs
> > on Linux. Do
> >
> > wget --help
> > or,
> > man wget
> >
> >
> Have you tried this lately? I looked at lynx, but the problem is
> that I couldn't navigate to the right download link.
> Cutting and pasting the url at the final step from a graphical
> web browser, for example, and using it with wget probably won't
> work either due to inconsistencies in session data (I'll try when
> I can access my terminal).
> Sun seem to be determined to force users through their new, fixed
> steps (probably for legal and security reasons), but this makes it
Sorry. I had forgotten the legal page. Use someone's desktop machine
:) --- You could write an original HTTP program though.
> somewhat inconvenient for command-line only users.
> Or, am I missing something? I hope so, because I'd like there to
> be a satisfactory, well defined way to achieve this.
> >>BTW, does anybody have any experience of, or know how
> >>the 1.4.2 VM performs on identical Win32 vs Linux PCs?
> >
> > Linux is faster and stable, less problematic as a server environment
> > than Windows. Java GUI implementaion is slightly
> > better on Windows than on Linux.
> I'm looking forward to finding out.
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