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• JCP Open EC Meeting on 30 September 2012

  - by heathervc

  The JCP program office and Executive Committee invites all Java Community members to attend the OPEN EC Meeting on Sunday, 30 September at the Clift Hotel in San Francisco.  The meeting is adjacent to The Zone at JavaOne, but no JavaOne (or any other kind) of pass is required to attend.  It is OPEN to all!  Agenda topics include: JCP.Next status/overview of JSRs 355 and 358, improving communications between the EC and the community; Open Q&A and reminders of JCP events at JavaOne & Annual awards.  Any other suggestions?  This meeting is for you.  Let us know your questions pmo at jcp.org. Or bring them with you.  Details below. JCP Public Executive Committee Face-to-Face Meeting Open to Executive Committee Members and the Java Developer Community Location: Clift Hotel, 495 Geary Street, San Francisco - Rita Room (downstairs from Lobby) Date and Time: 9/30/12, 2:00 PM - 3:30 PM See you there.  Check out all of the JCP @ JavaOne events.

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• Remapping special keys on the keyboard

  - by thedude

  Hey there. I just bought a new keyboard today, and to my suprise it doesn't include "Next/Previus track" keys, although it has other media keys. It also has useless keys like "Home" which brings up the webbrowser. Or well, it's not actually the "Home" key, it's a special key on the keyboard with a house on it - no idea what it's called. Anyway, so i'd like to remap the "House" key to "Next track". I've tried three different remapping programs now and none of them seem to be working. I think the real problem is that it's a special key, so it's not included in any keyboard remapping applications. The keyboard is a Logitech, can't seem to find the exact model though. Any tips?

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• Selenium RC htmlsuite error with IE

  - by Alina

  I am trying to use Selenium RC but i keep getting this error whenever i start the server. "HTML suite exception seen: java.lang.RuntimeException: sessionId 7643 doesn't exist; perhaps this session w as already stopped?" The command I use is java -jar C:\selenium-remote-control-1.0.3\selenium-server-1.0.3\selenium-server.jar -multiwindow -htmlSuite "*iexplore" "https://user1.apps.com/" "C:\TEMP\Selenium Tests\TestSuite1.html" "C:\TEMP\Selenium Tests\results.html" However with the same command if I change *iexplore to *firefox then it works. I need to run the test with IE, please help!Many thanks!!

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• Is there a simple, flat, XML-based query-able data storage solution? [closed]

  - by alex gray

  I have been in long pursuit of an XML-based query-able data store, and despite continued searches and evaluations, I have yet to find a solution that meets the my needs, which include: Data is wholly contained within XML nodes, in flat text files. There is a "native" - or at least unobtrusive - method with which to perform Create/Read/Update/Delete (CRUD) operations onto the "schema". I would consider access via http, XHR, javascript, PHP, BASH, or PERL to be unobtrusive, dependent on the complexity of the set of dependencies. Server-side file-system reads and writes. A client-side interface element, accessible in any browser without a plug-in. Some extra, preferred (but optional) requirements include: Respond to simple SQL, or similarly syntax queries. Serve the data on a bare bones https server, with no "extra stuff", either via XMLHTTPRequest, HTTP proper, or JSON. A few thoughts: What I'm looking for may be possible via some Java server implementations, but for the sake of this question, please do not suggest that - unless it meets ALL the requirements. Java, especially on the client-side is not really an option, nor is it appealing from a development viewpoint.* I know walking the filesystem is a stretch, and I've heard it's possible with XPATH or XSLT, but as far as I know, that's not ready for primetime, nor even yet a recommendation. However the ability to recursively traverse the filesystem is needed for such a system to be of useful facility. At this point, I have basically implemented what I described via, of all things, CGI and Bash, but there has to be an easier way. Thoughts?

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• Remote connection to dynamic public ip & private ip addresses

  - by user51737

  Many times I connected to windows computer which has static public ip address via remote desktop over wan links. I'm wondering how could I connect to the remote computer that has dynamic public ip address & private ip addresses assigned. I've 2 systems at home: xp system-------connected to internet(dynamic public ip) & allowed other users to connected to the internet on the interface. windows vista system--------enabled dhcp on the interface to access internet from xp. How could I remotely connect from my office to the 'vista system'?. If I've a router/modem at my home it may be possible to allow the ports for the system but I don't. Any tips?

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• Small 64-bit linux server distro with low memory footprint?

  - by djangofan

  I am looking for a linux server distro with a low memory footprint. I usually use Ubuntu but I need something with a smaller footprint in order to run a large Java JVM service inside of it and also run X-windows. Any ideas? The Java service needs to handle a 3GB memory heap and so I require a 64-bit OS and JRE. http://en.wikipedia.org/wiki/Comparison%5Fof%5FLinux%5Fdistributions I am thinking that ArchLinux is the only one that I can find right now. It uses 250MB out of the box (without X-win). Any better suggestions?

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• Can't access internet even though everything is working

  - by entity64

  A friend recently upgraded to a new cable internet connection. The modem connects to the router and various PCs and smartphones from her roommates connect to the router. They don't have any problem accessing the internet. She has Windows 8 and can't access any website (via wifi and ethernet). DNS (UDP) is working, DHCP set up everything correctly, Wifi is working, Trace routes and Pings (ICMP) go through with no problem at all. But neither Dropbox nor Skype nor Spotify nor any browser (all TCP) can access any website. The thing is though, she can connect through the university wifi and via a neighbors wifi. It's just her home connection. No firewalls are running and the computer is clean - no malware. How could it be that only her home connection won't work and others do?

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• Backing up a Linux VPS with RSync to Vista

  - by Frank

  I've been working to setup a Linux VPS to host a couple of Wordpress sites and eventually a Mercurial server. I've setup one site and things have gone well. However, before I start moving other things to the VPS, I need to setup a backup solution. My provider, Linode, suggest RSync (among a couple of other options) to do backups. I've seen a few posts on this site that suggests other backup solutions including going to the Amazon Cloud but that costs money and the VPS is all the money I want to spend on this for the time being. So, to help solve that I want to have my backup computer be my home desktop computer. Assuming I'm using RSync, is it possible to use my Vista based home computer to become the destination for the backup? And if it is possible, what type of command or connection would I need to configure on the vista machine? Any insight would be helpful. It's probably obvious, but I've never used RSync.

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• Inactive JSRs looking for Spec Leads

  - by heathervc

  You may have noticed that some JSRs have a classification of "Inactive" on their JSR page.  The introduction of this term in 2009 was part of an effort to enable and encourage more transparency into the development of JSRs.  You can read more about Inactive JSRs here and also in the JCP FAQ.The following JSR proposals have been Inactive since at least 2009. If you are a JCP Member and are interested in taking over the Specification Lead role for one of these JSRs, please contact the PMO at [email protected] on or before 23 April 2012. With that message, please include the following: the subject line "Spec Lead for JSR ###," where '###' is the JSR number which JCP Member you represent why you wish to take over the Specification lead role Here is the current list of Inactive JSRs for which Members can request to become Specification Leads: JSR 122, JAIN JCAT JSR 161, JAIN ENUM API Specification JSR 182, JPay - Payment API for the Java Platform JSR 210, OSS Service Quality Management API JSR 241, The Groovy Programming Language JSR 251, Pricing API JSR 278, Resource Management API for Java ME JSR 304, Mobile Telephony API v2 JSR 305, Annotations for Software Defect Detection JSR 320, Services Framework

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• How to setup a fast VPN server

  - by Saif Bechan

  I am trying to set up a VPN that has a fast download speed. The server I have is a linux server and from there I can download 2 megabytes a second. At home I can also download with 2 megabytes a second. All the downloads I do are from the same source, no different server. Now I have set up a VPN connection between my home and the server, and now I am only downloading 64 kilobytes a second! The connection I have created is a PPTP server on a debian machine. Now my question is if it is possible to optimize this connection. Should I maybe switch to OpenVPN, or change operating systems? Or are there some kind of settings to tweak to make the connection optimal. PS. The server I am running is on a XEN node. I have done the proper ip forwarding.

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• Twitter Tuesday - Top 10 @ArchBeat Tweets - August 12-18, 2014

  - by Bob Rhubart-Oracle

  Man in gray hat: "You know, more than three thousand people follow @OTNArchBeat on Twitter. I wonder which tweets were the most popular over the last seven days." Man in brown hat: "Shut up! I think I see a UFO!" Man in gray hat: "That's OK. I'll just read this blog post." RT @java: "Programmers are creative people and typically delight in contriving clever ways to solve problems." -Casimir Saternos in @OracleJavaMag Aug 18, 2014 at 12:54 PM The Offer Still Stands: Produce your own episode of the OTN ArchBeat Podcast. Click for details. Aug 13, 2014 at 02:03 PM Binge-Ready! Watch the Top 10 OTN ArchBeat Videos featuring @stewartbryson @stenvesterli @gurcanorhan Aug 13, 2014 at 11:49 AM Oracle Announces First Java 9 Features | InfoQ Aug 18, 2014 at 12:20 PM Getting Started wit the #Coherence Memcached Adaptor | David Felcey Aug 18, 2014 at 10:19 AM #WebLogic Data Source Connection Labeling | Steve Felts Aug 14, 2014 at 10:03 AM How to introduce #DevOps into a moribund corporate culture | ZDNet Aug 15, 2014 at 11:23 AM Sample Chapter: Installing Oracle #WebLogic Server 12c and Using the Management Tools | Sam Alapati Aug 14, 2014 at 11:09 AM Building a Responsive #WebCenter Portal Application | @JayJayZheng Aug 12, 2014 at 11:04 AM #OEM12c Cloud Control authorization with Active Directory | Jeroen Gouma Aug 14, 2014 at 10:16 AM

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• How to secure Apache for shared hosting environment? (chrooting, avoid symlinking...)

  - by Alessio Periloso

  I'm having problems dealing with Apache configuration: the problem is that I want to limit each user to his own docroot (so, a chroot() would be what I'm looking for), but: Mod_chroot works only globally and not for each virtualhost: i have the users in a path like the following one /home/vhosts/xxxxx/domains/domain.tld/public_html (xxxxx is the user), and can't solve the problem chrooting /home/vhosts, because the users would still be allowed to see each other. Using apache-mod-itk would slow down the websites too much, and I'm not sure if it would solve anything Without using any of the previous two, I think the only thing left is avoiding symlinking, not allowing the users to link to something that doesn't belong to them. So, I think I'm going to follow the third point but... how to efficiently avoid symlinking while still keeping mod_rewrite working?! The php has already been chrooted with php-fpm, so my only concern is about Apache itself.

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• Skillset improvement in coming new year

  - by exiter2000

  Here is a little background information. I have been working for Java 10 years. The product I am working on went to live about 3 years ago. Now, the product is getting stable. After all the post-product drama, I gained a lot of knowledge about Oracle & SQL. People(mainly management) were desperated enough to give me deep oracle-related task over DBAs. I admit I considered becoming DBA but eventually decided to remain as a programmer. DBAs & Management are demanding all the DB & Query related task back to DBA, which makes me a bit sad. In short, I anticipate a lot of time next year. What would you do to improve your skillset?? I am thinking to upgrade my Java version(Not from experience though, we are using JDK1.5) to 1.6 getting certificate. Any good idea from fellow developers?? -----------Edit --------------------- How about data modeling for application? Do you guys think it is developer role??

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• How can I extend the desktop onto an external monitor/projector?

  - by hellocatfood

  I've plugged in a projector into my laptop and I'm attempting to extend the desktop onto it (so that I can run a full screen app on the projector and have the controls on my laptop). I'm able to mirror the screens effectively (it does this by default) but I can't extend it. When I untick "Mirror screens" and press apply it asks me to log out and then back in again but it goes back to mirroring the screens. I'm able to extend desktop on to my external monitor at home, just not this projector. Is there a manual way or other way to do this other that through Monitors setting? My computer model is Dell Studio 1555: Pentium Dual Core T4300(2.1GHz,800MHz,1MB), 4096MB 800MHz DDR2 Dual Channel, 512 MB ATI Mobility RADEON HD 4570 using the ATI proprietary driver. My screen resolution is 1366x768 (16:9) The projector that it wont connect properly is a Hitachi CPX3. That page specifies that it's especially designed for projectors that use 16:10 aspect ratio, but considering my external monitor at home uses 4:3 should the differences in aspect ratio matter or be causing this error?

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• Remote desktop won't connect to Win7 Vmware Virtual machine

  - by Rodniko

  created a Virtual machine using VMware. The VM is on and i succeeded to login and work on it with the Vmware console. now i want to use the "remote desktop connection" to connect to it. i enabled the remote access on the home premium Win7 that i installed on the VM. in the Remote Desktop i entered the ip (same network (home network))). it just won't connect. i also disabled the firewall on the Win7 , but it still won;t connect. i have another VM with the same Win7 that remote desktop works fine with.

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• Installing Oracle11gr2 on redhat linux

  - by KItis

  I have basic question about installing applications on linux operating system. i am going to express my issue considering oracle db installation as a example. when installing oracle database , i created a user group called dba and and user in this group called ora112. so this users is allowed to install database. so my question is if ora112 uses umaks is set to 077, then no other uses will be able to configure oracle database. why do we need to follow this practice. is it a accepted procedure in application installation on Linux. please share your experience with me. thanks in advance for looking into this issue say i install java application on this way. then no other application which belongs to different user account won't be able use java running on this computer because of this access restriction.

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• Is looking for code examples constantly a sign of a bad developer?

  - by Newly Insecure

  I am a comp sci student with several years of experience in C and C++, and for the last few years I've been constantly working with Java/Objective C doing app dev and now I have switched to web dev and am mainly focused on ruby on rails and I came to the realization that (as with app dev, really) I reference other code wayyyy too much. I constantly google functionality for lots of things I imagine I should be able to do from scratch and it's really cracked my confidence a bit. Basic fundamentals are not an issue, I hate to use this as an example but I can run through javabat in both java/python at a sprint - obviously not an accomplishment and but what I mean to say is I have a strong base for the fundamentals I think? I know what I need to use typically but reference syntax constantly. Would love some advice and input on this, as it has been holding me back pretty solidly in terms of looking for work in this field even though I'm finishing my degree. My main reason for asking is not really about employment, but more that I don't want to be the only guy at a hackathon not hammering out nonstop code and sitting there with 20 google/github tabs open, and I have refrained from attending any due to a slight lack of confidence... Is a person a bad developer by constantly looking to code examples for moderate to complex tasks?

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• Vim digraphs is not working

  - by Hauleth

  I've tried to input digraphs in Vim (without vi compatibility), and unfortunately I can't. After using ControlKP * it should input big greek pi letter. I've also tried using PBS * with :set digraph, but no success either. My gvim --version output: VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Oct 23 2012 18:42:18) Included patches: 1-712 Compiled by ArchLinux Big version with GTK2 GUI. Features included (+) or not (-): +arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset +cindent +clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments +conceal +cryptv +cscope +cursorbind +cursorshape +dialog_con_gui +diff +digraphs +dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search +farsi +file_in_path +find_in_path +float +folding -footer +fork() +gettext -hangul_input +iconv +insert_expand +jumplist +keymap +langmap +libcall +linebreak +lispindent +listcmds +localmap +lua +menu +mksession +modify_fname +mouse +mouseshape +mouse_dec +mouse_gpm -mouse_jsbterm +mouse_netterm +mouse_sgr -mouse_sysmouse +mouse_urxvt +mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg +path_extra +perl +persistent_undo +postscript +printer -profile +python -python3 +quickfix +reltime +rightleft +ruby +scrollbind +signs +smartindent -sniff +startuptime +statusline -sun_workshop +syntax +tag_binary +tag_old_static -tag_any_white -tcl +terminfo +termresponse +textobjects +title +toolbar +user_commands +vertsplit +virtualedit +visual +visualextra +viminfo +vreplace +wildignore +wildmenu +windows +writebackup +X11 -xfontset +xim +xsmp_interact +xterm_clipboard -xterm_save system vimrc file: "/etc/vimrc" user vimrc file: "$HOME/.vimrc" user exrc file: "$HOME/.exrc" system gvimrc file: "/etc/gvimrc" user gvimrc file: "$HOME/.gvimrc" system menu file: "$VIMRUNTIME/menu.vim" fall-back for $VIM: "/usr/share/vim" Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -pthread -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -I/usr/local/include -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 Linking: gcc -L. -Wl,-O1,--sort-common,--as-needed,-z,relro -rdynamic -Wl,-export-dynamic -Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE -Wl,-O1,--sort-common,--as-needed,-z,relro -L/usr/local/lib -Wl,--as-needed -o vim -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lglib-2.0 -lSM -lICE -lXt -lX11 -lXdmcp -lSM -lICE -lm -lncurses -lnsl -lacl -lattr -lgpm -ldl -L/usr/lib -llua -Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE -Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector -L/usr/local/lib -L/usr/lib/perl5/core_perl/CORE -lperl -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc -L/usr/lib/python2.7/config -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic -lruby -lpthread -lrt -ldl -lcrypt -lm -L/usr/lib Can you tell me how to get my ControlK digraphs work? EDIT: Output of :verbose set enc? fenc? is: encoding=utf-8 Last set from ~/.vimrc fileencoding=

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• NFS users getting a laggy GUI expierence

  - by elzilrac

  I am setting up a system (ubuntu 12.04) that uses ldap, pam, and autofs to load users and their home folders from a remote server. One of the options for login is sitting down at the machine and starting a GUI session. Programs such as chormium (browser) that preform many read/write operations in the ~/.cache and ~/.config files are slowing down the GUI experience as well as putting strain of the NFS server that is causing other users to have problems. Ubuntu had the handy-dandy XDG_CONFIG_HOME and XDG_CACHE_HOME variables that can be set to change the default location of .cache and .config from the home folder to somewhere else. There are several places to set them, but most of them are not optimal. /etc/environment pros: will work across all shells cons: cannot use variables like $USER so that you can't make users have different new locations for .cache and .config. Every users' new location would be the same directory. /etc/bash.bashrc pros: $USER works, so you can place them in different folders cons: only gets run for bash compatible shells ~/.pam_environment pros: works regardless of shell cons: cannot use system variables (like $USER), has it's own syntax, and has to be created for every user

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• Is there a way to only require password on waking from sleep and not on screensaver (In Snow Leopard

  - by Vitaly Kushner

  I hate it when it asks me for password when I'm at home getting away from a computer for a while. I do like it having a screensaver though. But for some reason I see that password settings for the screensaver is merged with the password settings for waking from sleep. And waking password is an essential security feature for me. Essentially when Im not in a secured environment I close the lid when going away from the laptop even for a minute, but at home I want it to stay open. Is there a way to have it ask for password only after sleep and not after screensaver?

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• Cannot establish ssh connection to computer on local network

  - by ovangle

  I've just (re)installed ubuntu 11.10 on my main pc, and the connection times out every time I try to ssh connect to my laptop (over the local network) to retrieve the files I backed up there. The connection times out every time I try to connect. I can establish a connection in the other direction without issue. Here's the verbose output I get when I try to connect: ovangle@ruby-EP43-DS3:~$ ssh -v [email protected] OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 10.1.1.4 [10.1.1.4] port 22. debug1: connect to address 10.1.1.4 port 22: Connection timed out ssh: connect to host 10.1.1.4 port 22: Connection timed out ssh is installed on both machines, and I've tried deleting '~/.ssh/known_hosts' on both machines, still nada. I've changed the sshd logging on the laptop to VERBOSE and restarted the daemon (because I wasn't getting any relevant syslog entries otherwise), and this is the log for the most recent connection attempt. EDIT: posted wrong logs last time. They just showed that there was a connection received, they weren't actually the sshd logs (which were in auth.log as I recently discovered). Unfortunately, that log is filling up with extremely weird error messages and it gives me no information about the connection. Nov 8 16:02:18 ovangle-A6Rp pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Nov 8 16:02:18 ovangle-A6Rp pkexec: pam_ck_connector(polkit-1:session): cannot determine display-device Nov 8 16:02:18 ovangle-A6Rp pkexec[6270]: ovangle: Executing command [USER=root] [TTY=unknown] [CWD=/home/ovangle] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 2] Nov 8 16:02:19 ovangle-A6Rp pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Nov 8 16:02:19 ovangle-A6Rp pkexec: pam_ck_connector(polkit-1:session): cannot determine display-device Nov 8 16:02:19 ovangle-A6Rp pkexec[6273]: ovangle: Executing command [USER=root] [TTY=unknown] [CWD=/home/ovangle] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 7]

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• Can gedit on mac be used to edit files over ssh?

  - by Dave

  I use a linux machine at work and a mac at home. I can ssh from my machine at home to my work machine. But the only editor that I have access to on the command line then is vi, which I don't like. Is there a way to use gedit on my mac to edit files remotely over an ssh connection? This page says that it can be done, but I think that it assumes that you are using gedit on ubuntu. On my mac (os 10.5.8) I don't have the "bookmark" option when I click "connect to server". http://thecodecentral.com/2010/04/02/use-gedit-as-remote-file-editor-via-ftp-and-ssh-ubuntu/comment-page-1#comment-50558

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• Symlink across local volumes in webroot?

  - by geerlingguy

  I am looking for a good short-term solution to storage space concerns on my website. Currently, I have all uploaded files (flash video, images, etc.) inside the 'files' directory in my web root (/home/account/public_html/files). That directory is located on my high-speed main hard drive (a 15k SCSI drive). I have another drive with much more capacity, but spinning at 10k rpm (so still fast, but not as good for random reads/writes as the main drive. The entire drive is mounted at /backup Right now I'm just using it as a backup volume. I would like to create a symlink from my /home/account/public_html/files folder to /backup/files, and have all files reside on the second drive. However, if someone accesses a file at http://www.example.com/files/filename.jpg, would it still work if I symlinked to the second drive? (Basically, would Apache/PHP automatically know to follow the symlink for that directory?).

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• Why is Python used for high-performance/scientific computing (but Ruby isn't)?

  - by Cyclops

  There's a quote from a PyCon 2011 talk that goes: At least in our shop (Argonne National Laboratory) we have three accepted languages for scientific computing. In this order they are C/C++, Fortran in all its dialects, and Python. You’ll notice the absolute and total lack of Ruby, Perl, Java. It was in the more general context of high-performance computing. Granted the quote is only from one shop, but another question about languages for HPC, also lists Python as one to learn (and not Ruby). Now, I can understand C/C++ and Fortran being used in that problem-space (and Perl/Java not being used). But I'm surprised that there would be a major difference in Python and Ruby use for HPC, given that they are fairly similar. (Note - I'm a fan of Python, but have nothing against Ruby). Is there some specific reason why the one language took off? Is it about the libraries available? Some specific language features? The community? Or maybe just historical contigency, and it could have gone the other way?

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