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• Tomcat dying silently on regular basis

  - by Hendrik

  My tomcat (6.0.32, Java Sun 1.6.0_22-b04 on Ubuntu 10.04) keeps crashing multiple times daily without any specific output in catalina.out. This usually happens on high load (see top output). Update: The pid-file is properly removed when this happens. Update 2: No CATALINA_OPTS set, _JAVA_OPTS are: export _JAVA_OPTIONS="-Xms128m -Xmx1024m -XX:MaxPermSize=512m \ -XX:MinHeapFreeRatio=20 \ -XX:MaxHeapFreeRatio=40 \ -XX:NewSize=10m \ -XX:MaxNewSize=10m \ -XX:SurvivorRatio=6 \ -XX:TargetSurvivorRatio=80 \ -XX:+CMSClassUnloadingEnabled \ -Djava.awt.headless=true \ -Dcom.sun.management.jmxremote \ -Dcom.sun.management.jmxremote.port=37331 \ -Dcom.sun.management.jmxremote.ssl=false \ -Dcom.sun.management.jmxremote.authenticate=true \ -Djava.rmi.server.hostname=(myhostname) \ -Dcom.sun.management.jmxremote.password.file=/etc/java-6-sun/management/jmxremote.password \ -Dcom.sun.management.jmxremote.access.file=/etc/java-6-sun/management/jmxremote.access" Top: top - 12:40:03 up 9 days, 12:15, 3 users, load average: 30.00, 22.39, 21.91 Tasks: 89 total, 4 running, 85 sleeping, 0 stopped, 0 zombie Cpu(s): 53.2%us, 9.7%sy, 0.0%ni, 34.7%id, 1.5%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 4194304k total, 3311304k used, 883000k free, 0k buffers Swap: 4194304k total, 0k used, 4194304k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 25850 tomcat6 20 0 1981m 1.2g 11m S 161 29.6 11:41.56 java 12632 mysql 20 0 393m 97m 4452 S 141 2.4 1690:05 mysqld 14932 nobody 20 0 253m 44m 9152 R 56 1.1 3:26.57 php-cgi 7011 nobody 20 0 241m 31m 9124 S 30 0.8 1:35.96 php-cgi 10093 nobody 20 0 228m 18m 8520 S 25 0.5 2:29.97 php-cgi 27071 nobody 20 0 237m 28m 8640 S 11 0.7 3:13.72 php-cgi 3306 nobody 20 0 227m 16m 6736 R 7 0.4 2:29.83 php-cgi 7756 nobody 20 0 261m 58m 15m R 5 1.4 2:22.33 php-cgi 7129 www-data 20 0 3646m 7228 1896 S 2 0.2 0:36.65 nginx 2657 nobody 20 0 228m 18m 8540 S 1 0.5 1:59.51 php-cgi 7131 www-data 20 0 3645m 6464 1960 S 1 0.2 0:34.13 nginx 7140 www-data 20 0 3652m 12m 1896 S 1 0.3 0:35.80 nginx 619 nobody 20 0 231m 29m 15m S 0 0.7 2:33.46 php-cgi 16552 nobody 20 0 250m 41m 8784 S 0 1.0 2:48.12 php-cgi 17134 nobody 20 0 239m 37m 16m S 0 0.9 2:32.86 php-cgi 21004 nobody 20 0 243m 34m 8700 S 0 0.8 1:19.85 php-cgi 26105 root 20 0 19220 1392 1060 R 0 0.0 0:00.82 top 32430 nobody 20 0 256m 47m 9196 S 0 1.2 2:19.01 php-cgi 314 nobody 20 0 256m 47m 8804 S 0 1.1 1:46.00 php-cgi 2111 nobody 20 0 253m 44m 9196 S 0 1.1 3:01.14 php-cgi 2142 root 20 0 26452 2564 868 S 0 0.1 0:00.56 screen 2144 root 20 0 19484 2012 1368 S 0 0.0 0:00.00 bash 2333 nobody 20 0 249m 41m 9160 S 0 1.0 1:10.33 php-cgi 2552 root 20 0 19484 2260 1620 S 0 0.1 0:00.01 bash 2587 nobody 20 0 258m 49m 9192 S 0 1.2 2:04.50 php-cgi 2684 root 20 0 4092 652 540 S 0 0.0 0:00.00 xvfb-run 2696 root 20 0 60720 13m 2352 S 0 0.3 0:09.12 Xvfb 2759 root 20 0 617m 12m 4676 S 0 0.3 0:00.66 node 3514 nobody 20 0 270m 61m 9216 S 0 1.5 3:13.69 php-cgi 5270 root 20 0 25164 1324 1036 S 0 0.0 0:00.01 screen 5402 nobody 20 0 227m 16m 8032 S 0 0.4 1:33.61 php-cgi 5765 root 20 0 81180 3820 3028 S 0 0.1 0:00.31 sshd 5798 nobody 20 0 242m 32m 9124 S 0 0.8 1:52.08 php-cgi 5856 root 20 0 19496 2292 1636 S 0 0.1 0:00.03 bash 6442 root 20 0 62332 20m 1960 S 0 0.5 0:30.58 mrtg 7082 root 20 0 88992 1916 1636 S 0 0.0 0:00.00 PassengerWatchd I can't find any concrete reason for it, no Exceptions or messages of a shutdown in catalina.out (and no other logs in tomcat's log dir). I can start up the service and it will run for a few days or just minutes before dying again. Is there somewhere else i could look for output? Could the kernel start killing threads due to a lack of ressources and by that bring the VM down?

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• NPM not installing dependencies?

  - by neezer

  Having trouble getting NPM to install dependencies with npm install -d in my project directory with a defined package.json file. Here's my package.json: https://gist.github.com/3068312 And after wiping my project root's node modules folder (rm -rf node_modules), I run npm install -d in my project root and am greeted with this: (ssh) /vagrant git:master ? npm install -d npm info it worked if it ends with ok npm info using [email protected] npm info using [email protected] npm info preinstall [email protected] npm http GET https://registry.npmjs.org/sinon npm http GET https://registry.npmjs.org/underscore npm http GET https://registry.npmjs.org/mocha npm http GET https://registry.npmjs.org/request npm http 304 https://registry.npmjs.org/sinon npm http 304 https://registry.npmjs.org/underscore npm http 304 https://registry.npmjs.org/mocha npm http 304 https://registry.npmjs.org/request npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info unbuild /vagrant/node_modules/underscore npm info unbuild /vagrant/node_modules/mocha npm info unbuild /vagrant/node_modules/sinon npm info unbuild /vagrant/node_modules/request npm ERR! error installing [email protected] npm info unbuild /vagrant/node_modules/underscore npm ERR! error rolling back [email protected] Error: UNKNOWN, unknown error '/vagrant/node_modules/underscore' npm ERR! Error: ENOENT, no such file or directory '/vagrant/node_modules/underscore/package.json' npm ERR! You may report this log at: npm ERR! <http://bugs.debian.org/npm> npm ERR! or use npm ERR! reportbug --attach /vagrant/npm-debug.log npm npm ERR! npm ERR! System Linux 3.2.0-23-generic npm ERR! command "node" "/usr/bin/npm" "install" "-d" npm ERR! cwd /vagrant npm ERR! node -v v0.6.12 npm ERR! npm -v 1.1.4 npm ERR! path /vagrant/node_modules/underscore/package.json npm ERR! code ENOENT npm ERR! message ENOENT, no such file or directory '/vagrant/node_modules/underscore/package.json' npm ERR! errno {} npm ERR! error installing [email protected] npm info unbuild /vagrant/node_modules/request npm ERR! error rolling back [email protected] Error: UNKNOWN, unknown error '/vagrant/node_modules/request' npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /vagrant/npm-debug.log npm not ok If I rerun npm install -d, the error changes to whatever the next package is... if I keep running it it over and over again, it eventually doesn't complain anymore and outputs: (ssh) /vagrant git:master ? npm install -d npm info it worked if it ends with ok npm info using [email protected] npm info using [email protected] npm info preinstall [email protected] npm info build /vagrant npm info linkStuff [email protected] npm info install [email protected] npm info postinstall [email protected] npm info ok However, none of the dependencies for any of these packages get installed. For instance, cheerio has a few dependencies, so when I try running my test suite, I'm greeted with: (ssh) /vagrant git:master ? mocha --compilers coffee:coffee-script --watch spec/* node.js:201 throw e; // process.nextTick error, or 'error' event on first tick ^ Error: Cannot find module 'cheerio-select' at Function._resolveFilename (module.js:332:11) at Function._load (module.js:279:25) at Module.require (module.js:354:17) What gives? I'm on Ubuntu Precise64 in a Vagrant virtual box.

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• How do I reduce the size of mlocate database?

  - by MountainX

  I'm out of space on /var 25G 25G 0 100% /var It looks like mlocate.db is the problem: # find . -printf '%s %p\n' | sort -nr | head 13140140032 ./lib/mlocate/mlocate.db.cgLMAM 12409839616 ./lib/mlocate/mlocate.db.MqGeqe cat /etc/updatedb.conf PRUNE_BIND_MOUNTS="yes" PRUNENAMES=".git .bzr .hg .svn" PRUNEPATHS="/tmp /var/spool /media" PRUNEFS="NFS nfs nfs4 rpc_pipefs afs binfmt_misc proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs shfs sysfs cifs lustre_lite tmpfs usbfs udf" I don't see anything else to prune. So how can I fix this? Thanks

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• Mount cifs on Ubuntu 11.10

  - by Renan Madeira

  I try mount some directories on my Ubuntu 11.10, but i can't it. mount -t cifs ///Renan /media/SM\ -\ Renan/ -o username=renan.madeira,password=,domain= When i open /media/SM\ -\ Renan, i received this message; bash: cd: /media/SM - Renan/: Permission denied I watch permissions on /media and see this; drwxrws--T 6 root 504 0 2011-08-21 21:35 SM - Renan 504 = GID of renan.madeira user on my samba server. Some suggestions?

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• Vim disables ibus IME -- is this a bug?

  - by misha

  I'm using ibus IME to input Japanese text into GVim. I have the following Vim script that I source when GVim starts up: autocmd InsertLeave * :call bug#onInsertLeave() function! bug#onInsertLeave() python << EOT import vim import ibus bus = ibus.Bus() ic = ibus.InputContext(bus, bus.current_input_contxt()) ic.disable() print "bug#onInsertLeave(): exiting" EOT endfunction The line that constructs the InputContext raises the exception: dbus.exception.DBusException: org.freedesktop.DBus.Error.Failed: no focused input context This happens under the following conditions: I enter insert mode I insert some Japanese text I exit insert mode If I don't enter any Japanese text through the IME, then the exception is not raised. I've also noticed that if I exit insert mode after entering some Japanese text while the IME is still enabled, then IME input is disabled (I can see the icon change in the taskbar). If I exit insert mode without entering any Japanese text, but while the IME is still enabled, then the IME stays enabled (the icon does not change). It seems like GVim is disabling the IME (or the IME is switching off) in some conditions. Could it be related to the exception? My questions are: Is this a bug? If it is, then whose bug is it? Vim, Ibus, or something else? Are there any ways to work around the exception? EDIT My system info: > misha@misha-lmd:~/git/iwait2013/lagos$ apt-cache policy ibus ibus: > Installed: 1.4.1-3ubuntu1 Candidate: 1.4.1-3ubuntu1 Version table: > *** 1.4.1-3ubuntu1 0 > 500 http://jp.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages > 100 /var/lib/dpkg/status misha@misha-lmd:~/git/iwait2013/lagos$ apt-cache policy vim vim: > Installed: 2:7.3.429-2ubuntu2.1 Candidate: 2:7.3.429-2ubuntu2.1 > Version table: *** 2:7.3.429-2ubuntu2.1 0 > 500 http://jp.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages > 100 /var/lib/dpkg/status > 2:7.3.429-2ubuntu2 0 > 500 http://jp.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages Ubuntu 12.04, Fluxbox

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• Speed-start your Linux App: Using DB2 and the DB2 Control Center

  This article guides you through setting up and using IBM DB2 7.2 with the Command Line Processor. You'll also learn to use the graphical Control Center, which helps you explore and control your databases, and the graphical Command Center, which helps you generate SQL queries. Other topics covered include Java runtime environment setup, useful Linux utility functions, and bash profile customization.

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• Ubuntu 13.10 isn't remembering my passwords anymore, why?

  - by Nik Reiman

  Ubuntu's password management used to be working just fine for me, but around two weeks ago after running apt-get upgrade, I've noticed that now it keeps "forgetting" my passwords. For instance, I need to manually enter passwords to unlock my ssh keys to use git, which previously was done automatically on login. My workplace's 802.11x authentication also no longer works, I need to manually re-auth just to connect to internet. What's going on?

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• SubCut Scala Dependency Injection Framework

  - by kerry

  It’s no secret I am a fan of dependency injection.  So I was happy to hear that Dick Wall of the Java Posse recently released a dependency injection framework for scala.  Called SubCut, or Scala Uniquely Bound Classes Under Traits, the project is a ‘mix of service locator and dependency injection patterns designed to provide an idiomatic way of providing configured dependencies to scala applications’. It’s hosted on github, so ‘git’ (rimshot) over there and try it out: Dependency injection framework for Scala

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• How I do VCS

  - by Wes McClure

  After years of dabbling with different version control systems and techniques, I wanted to share some of what I like and dislike in a few blog posts.  To start this out, I want to talk about how I use VCS in a team environment.  These come in a series of tips or best practices that I try to follow.  Note: This list is subject to change in the future. Always use some form of version control for all aspects of software development. Development is an evolution.  Looking back at where we were is an invaluable asset in that process.  This includes data schemas and documentation. Reverting / reapplying changes is absolutely critical for efficient development. The tools I use: Code: Hg (preferred), SVN Database: TSqlMigrations Documents: Sometimes in code repository, also SharePoint with versioning Always tag a commit (changeset) with comments This is a quick way to describe to someone else (or your future self) what the changeset entails. Be brief but courteous. One or two sentences about the task, not the actual changes. Use precommit hooks or setup the central repository to reject changes without comments. Link changesets to documentation If your project management system integrates with version control, or has a way to externally reference stories, tasks etc then leave a reference in the commit.  This helps locate more information about the commit and/or related changesets. It’s best to have a precommit hook or system that requires this information, otherwise it’s easy to forget. Ability to work offline is required, including commits and history Yes this requires a DVCS locally but doesn’t require the central repository to be a DVCS.  I prefer to use either Git or Hg but if it isn’t possible to migrate the central repository, it’s still possible for a developer to push / pull changes to that repository from a local Hg or Git repository. Never lock resources (files) in a central repository… Rude! We have merge tools for a reason, merging sucked a long time ago, it doesn’t anymore… stop locking files! This is unproductive, rude and annoying to other team members. Always review everything in your commit. Never ever commit a set of files without reviewing the changes in each. Never add a file without asking yourself, deep down inside, does this belong? If you leave to make changes during a review, start the review over when you come back.  Never assume you didn’t touch a file, double check. This is another reason why you want to avoid large, infrequent commits. Requirements for tools Quickly show pending changes for the entire repository. Default action for a resource with pending changes is a diff. Pluggable diff & merge tool Produce a unified diff or a diff of all changes.  This is helpful to bulk review changes instead of opening each file. The central repository is not your own personal dump yard.  Breaking this rule is a sure fire way to get the F bomb dropped in front of your name, multiple times. If you turn on Visual Studio’s commit on closing studio option, I will personally break your fingers. By the way, the person(s) in charge of this feature should be fired and never be allowed near programming, ever again. Commit (integrate) to the central repository / branch frequently I try to do this before leaving each day, especially without a DVCS.  One never knows when they might need to work from remote the following day. Never commit commented out code If it isn’t needed anymore, delete it! If you aren’t sure if it might be useful in the future, delete it! This is why we have history. If you don’t know why it’s commented out, figure it out and then either uncomment it or delete it. Don’t commit build artifacts, user preferences and temporary files. Build artifacts do not belong in VCS, everything in them is present in the code. (ie: bin\*, obj\*, *.dll, *.exe) User preferences are your settings, stop overriding my preferences files! (ie: *.suo and *.user files) Most tools allow you to ignore certain files and Hg/Git allow you to version this as an ignore file.  Set this up as a first step when creating a new repository! Be polite when merging unresolved conflicts. Count to 10, cuss, grab a stress ball and realize it’s not a big deal.  Actually, it’s an opportunity to let you know that someone else is working in the same area and you might want to communicate with them. Following the other rules, especially committing frequently, will reduce the likelihood of this. Suck it up, we all have to deal with this unintended consequence at times.  Just be careful and GET FAMILIAR with your merge tool.  It’s really not as scary as you think.  I personally prefer KDiff3 as its merging capabilities rock. Don’t blindly merge and then blindly commit your changes, this is rude and unprofessional.  Make sure you understand why the conflict occurred and which parts of the code you want to keep.  Apply scrutiny when you commit a manual merge: review the diff! Make sure you test the changes (build and run automated tests) Become intimate with your version control system and the tools you use with it. Avoid trial and error as much as is possible, sit down and test the tool out, read some tutorials etc.  Create test repositories and walk through common scenarios. Find the most efficient way to do your work.  These tools will be used repetitively, so inefficiencies will add up. Sometimes this involves a mix of tools, both GUI and CLI. I like a combination of both Tortoise Hg and hg cli to get the job efficiently. Always tag releases Create a way to find a given release, whether this be in comments or an explicit tag / branch.  This should be readily discoverable. Create release branches to patch bugs and then merge the changes back to other development branch(es). If using feature branches, strive for periodic integrations. Feature branches often cause forked code that becomes irreconcilable.  Strive to re-integrate somewhat frequently with the branch this code will ultimately be merged into.  This will avoid merge conflicts in the future. Feature branches are best when they are mutually exclusive of active development in other branches. Use and abuse local commits , at least one per task in a story. This builds a trail of changes in your local repository that can be pushed to a central repository when the story is complete. Never commit a broken build or failing tests to the central repository. It’s ok for a local commit to break the build and/or tests.  In fact, I encourage this if it helps group the changes more logically.  This is one of the main reasons I got excited about DVCS, when I wanted more than one changeset for a set of pending changes but some files could be grouped into both changesets (like solution file / project file changes). If you have more than a dozen outstanding changed resources, there should probably be more than one commit involved. Exceptions when maintaining code bases that require shotgun surgery, in this case, it’s a design smell :) Don’t version sensitive information Especially usernames / passwords   There is one area I haven’t found a solution I like yet: versioning 3rd party libraries and/or code.  I really dislike keeping any assemblies in the repository, but seems to be a common practice for external libraries.  Please feel free to share your ideas about this below.    -Wes

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• Today’s Performance Tip: Views are for Convenience, Not Performance!

  - by Jonathan Kehayias

  I tweeted this last week on twitter and got a lot of retweets so I thought that I’d blog the story behind the tweet. Most vendor databases have views in them, and when people want to retrieve data from a database, it seems like the most common first stop they make are the vendor supplied Views.  This post is in no way a bash against the usage or creation of Views in a SQL Server Database, I have created them before to simplify code and compartmentalize commonly required queries so that there...(read more)

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• ming 0.4.2 compilation errors on Ubuntu 12.04 when installing from source code

  - by gmuhammad

  I am trying to install ming 0.4.2 from source code and it was compilable before on Ubuntu 10.04, but now it' giving following compilation errors when I try to install using command sudo make install (libpng is already installed). /bin/bash ../libtool --tag=CC --mode=link gcc -g -O2 -Wall -DSWF_LITTLE_ENDIAN -o img2swf img2swf.o ../src/libming.la libtool: link: gcc -g -O2 -Wall -DSWF_LITTLE_ENDIAN -o .libs/img2swf img2swf.o ../src/.libs/libming.so gcc -DHAVE_CONFIG_H -I. -I../src -I../src -g -O2 -Wall -DSWF_LITTLE_ENDIAN -MT png2dbl.o -MD -MP -MF .deps/png2dbl.Tpo -c -o png2dbl.o png2dbl.c png2dbl.c: In function ‘readPNG’: png2dbl.c:64:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] mv -f .deps/png2dbl.Tpo .deps/png2dbl.Po /bin/bash ../libtool --tag=CC --mode=link gcc -g -O2 -Wall -DSWF_LITTLE_ENDIAN -o png2dbl png2dbl.o ../src/libming.la libtool: link: gcc -g -O2 -Wall -DSWF_LITTLE_ENDIAN -o .libs/png2dbl png2dbl.o ../src/.libs/libming.so png2dbl.o: In function `readPNG': /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:69: undefined reference to `png_create_read_struct' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:74: undefined reference to `png_create_info_struct' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:82: undefined reference to `png_create_info_struct' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:97: undefined reference to `png_init_io' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:98: undefined reference to `png_set_sig_bytes' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:99: undefined reference to `png_read_info' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:101: undefined reference to `png_get_IHDR' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:127: undefined reference to `png_get_valid' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:156: undefined reference to `png_read_update_info' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:158: undefined reference to `png_get_IHDR' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:162: undefined reference to `png_get_channels' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:187: undefined reference to `png_get_rowbytes' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:194: undefined reference to `png_read_image' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:128: undefined reference to `png_set_expand' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:135: undefined reference to `png_set_strip_16' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:143: undefined reference to `png_set_gray_to_rgb' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:151: undefined reference to `png_set_filler' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:125: undefined reference to `png_set_packing' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:107: undefined reference to `png_get_valid' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:117: undefined reference to `png_get_PLTE' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:78: undefined reference to `png_destroy_read_struct' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:92: undefined reference to `png_destroy_read_struct' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:86: undefined reference to `png_destroy_read_struct' png2dbl.o: In function `writeDBL': /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:278: undefined reference to `floor' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:280: undefined reference to `compress2' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:278: undefined reference to `floor' /home/gmuhammad/Downloads/ming-0.4.2/util/png2dbl.c:280: undefined reference to `compress2' collect2: ld returned 1 exit status make[1]: *** [png2dbl] Error 1 make[1]: Leaving directory `/home/gmuhammad/Downloads/ming-0.4.2/util' make: *** [install-recursive] Error 1

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• Multiple Depends/Recommends/[…] in a control file?

  - by miK

  Is it possible to have multiple lines for any type of field in a dpkg control file? This is not about line continuation, but e.g. Depends interspersed with Recommends like so: Depends: git, etckeeper, apt-file Recommends: equivs Depends: mplayer, pidgin, dlocate, pwsafe, ciso Recommends: aria2 And so on. Is this allowed, is it unspecified (and some tool is going to cough on it) or is it explicitly forbidden? (Couldn't find anything in debian-policy, either)

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• Best IDE for HTML, CSS, and Javascript for mac [closed]

  - by jon2512chua

  I'm currently looking to move to using an IDE for web development. The options I'm considering are: Aptana Studio Coda Expresso Please base your answers on the following criteria, in descending order of importance: Supports HTML, CSS, JavaScript Powerful (having good code completion, good debugger, great syntax highlighting etc) Fast and light Supports HTML5, CSS3, and major JavaScript frameworks (JQuery or YUI) Great design (both usability and aesthetics) Supports PHP, Ruby, and Python Has Git integrated I've updated the question to be more objective. I'm mainly looking for an answer that addresses how well each of the IDEs addresses my criteria.

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• Stairway to XML: Level 8 - Deleting Data from an XML Instance

  in order to use the modify() method to delete data from typed and untyped XML instances, you must pass an XML DML expression as an argument to the method. That expression must include the delete keyword, along with an XQuery expression that defines the XML component to be deleted. Robert makes it seem simple, as usual. The best way to version control T-SQLSSMS plug-in SQL Source Control connects SVN, TFS, Git, Hg and all others to SQL Server. Learn more.

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• execute script with sudo after login

  - by Kalamalka Kid

  i need to execute the following commands AFTER login. sudo hdparm -y /dev/disk/by-uuid/443AFBAD7FE50945 sudo hdparm -y /dev/disk/by-uuid/7ABB49654B799D40 (trying to edit rc.local does not work nor does using hdparm.conf because as soon as I log in the disks start up again). I have tried numerous things like bash files and autossh entries in the startup applications with no luck because sudo is involved.

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• What do you think was a poor design choice in Java

  - by Phobia

  Java has been one of the most (the most?) popular programming languages till this day, but this also brought controversy as well. A lot of people now like to bash Java simply because "it's slow", or simply because it's not language X, for example. My question isn't related to any of these arguments at all, I simply want to know what you consider a design flaw, or a poor design choice in Java, and how it might be improved from your point of view. Something like this.

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• Execute command from file in current shell

  - by Pandya

  I want to executed command from file (which is script) in current shell in terminal. Example: I have file ch_dir contains following: #!/bin/bash cd /usr Now if I execute file usually as following then it executes commands in different shell: pandya@pandya-desktop:~$ ./ch_dir pandya@pandya-desktop:~$ Here cd /user is executed in different shell. But I want to execute in Current shell. How do I do that? Note: Here cd is only used to explain. Question's aim is to execute any command in current shell

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• ERROR: GNU libc not found!

  - by deneme

  While using make.sh command for toolchain, I encountered the following error: Checking for toolchain prerequisites Checking for GNU bash [ DONE ] Checking for GNU binutils [ DONE ] Checking for GNU bison [ DONE ] Checking for GNU bzip2 [ DONE ] Checking for GNU coreutils [ DONE ] Checking for GNU diffutils [ DONE ] Checking for GNU findutils [ DONE ] Checking for GNU awk [ DONE ] Checking for GNU CC [ DONE ] Checking for GNU libc [ FAIL ] ERROR: GNU libc not found! How can I solve this problem ?

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• Commit Review Questions

  - by Wes McClure

  Note: in this article when I refer to a commit, I mean the commit you plan to share with the rest of the team, if you have local commits that you plan to amend/combine, I am referring to the final result. In time you will find these easier to do as you develop, however, all of these are valuable before checking in!  The pre commit review is a nice time to polish what might have been several hours of intense work, during which these things were the last things on your mind!  If you are concerned about losing your work in the process of responding to these questions, first do a check-in and amend it as you go (assuming you are using a tool such as git that supports this), rolling the result into one nice commit for everyone else.  Did you review your commit, change by change, with a diff utility? If not, this is a list of reasons why you might want to start! Did you test your changes? If the test is valuable to be automated, is it? If it’s a manual testing scenario, did you at least try the basics manually? Are the additions/changes formatted consistently with the rest of the project? Lots of automated tools can help here, don’t try to manually format the code, that’s a waste of time and as a human you will fail repeatedly. Are these consistent: tabs versus spaces, indentation, spacing, braces, line breaks, etc Resharper is a great example of a tool that can automate this for you (.net) Are naming conventions respected? Did you accidently use abbreviations, unless you have a good reason to use them? Does capitalization match the conventions in the project/language? Are files partitioned? Sometimes we add new code in existing files in a pinch, it’s a good idea to split these out if they don’t belong ie: are new classes defined in new files, if this is something your project values? Is there commented out code? If you are removing an existing feature, get rid of it, that is why we have VCS If it’s not done yet, then why are you checking it in? Perhaps a stash commit (git)? Did you leave debug or unnecessary changes? Do you understand all of the changes? http://geekswithblogs.net/wesm/archive/2012/04/11/programming-doesnrsquot-have-to-be-magic.aspx Are there spelling mistakes? Including your commit message! Is your commit message concise? Is there follow up work? Are there tasks you didn’t write down that you need to follow up with? Are readability or reorganization changes needed? This might be amended into the final commit, or it might be future work that needs added to the backlog. Are there other things your team values that you should review?

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• How can I run unity with Slim with sound

  - by Samir

  I'm trying to start the unity environment from slim display manager, everything goes fine, except by the sound that don't work, the device just dont appear in the device list I already changed the slim config file to start with this code below, but it didnt solve the problem.... login_cmd exec ck-launch-session dbus-launch /bin/bash -login /etc/X11/Xsession %session I believe the it is related with some thing that the gdm/lighdm start with the session and slim dont do that When I use the lighdm or gdm to start the environment everything works fine

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• Linux kernel regression on power usage

  - by dago

  Webupd8 reported this power management fix for the 2.6.38 Linux kernel regression: Add the following to the boot grub line "pcie_aspm=force" My question - how does this suggested fix differ from this hint from powertop: Suggestion: Enable Device Power Management by pressing the P key, which execute the following action: find /sys/devices/pci* -path "*power/control" -exec bash -c "echo auto > '{}'" \;

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• What version control system can manage all aspects?

  - by Andy Canfield

  A few months ago I dug into Subversion and GIT and was disappointed. They handle SOURCE CODE fine but not other aspects. For example, a web site under version control needs to manage file/directory ownership, file/directory read & write access, Access Control Lists, timestamps, database contents. and external links. Is there a version control system that can do as perfect a reversion as reloading from a month-old backup?

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• "No such file or directory" when invoking java

  - by Andrey Botalov

  I'm trying to re-install Oracle JDK 7 32 bit to 64 bit Ubuntu (previously 64 bit JDK was installed). JDK is currently present at /usr/lib/jvm/jdk1.7.0. I invoke sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk1.7.0/bin/java" sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1 And then: /usr/lib/jvm/jdk1.7.0/bin$ java bash: /usr/bin/java: No such file or directory Why java can't be invoked?

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• Installing a minimal GUI + VNC

  - by Malachi

  I have a fresh install of Ubuntu 10.04 Server on my VPS and would like to install a minimal GUI onto this and allow VNC access to. Please could someone outline the steps required to set this up so that I can VNC to my machine under a newly created user account. Create the user: useradd -m -s /bin/bash -p password -d /home/usera userA chown userA:users /home/usera Install the GUI sudo apt-get install --no-install-recommends ubuntu-desktop Setup VNC ?

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• How to make a directory with permanent permissions different from default

  - by Carlos Fernández San Millán

  I have system-wide default permissions set with umask 027. I am in the need to make a directory whose sub-directories would need 775 permission and whose files would need 664 permissions and make these permissions permanent after booting the system. I am looking for the best options out there without compromising security. Any ideas? Thank you. Some research done: sudo chfn -o "umask=002" daemon_username bash script running at boot with umask 022 on the desired directory

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