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• Arthur C. Clarke Describe the Future Internet in 1974 [Video]

  - by Jason Fitzpatrick

  Arthur C. Clarke–futurist and Sci-Fi writer–talks to a reporter from the Australian Broadcasting Network about the future of computing and the internet in this 1974 interview. Clearly he had a pretty good handle on the direction information technology and networking was going–we’re certainly using computers largely in the fashion he describes. [via Neatorama] The Best Free Portable Apps for Your Flash Drive Toolkit How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC

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• Augmented Reality and Translation: Use Case in Enterprise?

  - by ultan o'broin

  Really love this iPhone app from Visual Quest: Word Lens Great to see the concept of augmented reality (a hot topic in UX) and translation coming together. Of course, I've downloaded the app and I'm trying it out already! Mashable say it all about this app in terms of how it seems like Sci-Fi is coming to life. However, the question remains: How could such an app be used in the enterprise applications space? Opinions welcome!

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• OS evaluate in bash script

  - by moata_u

  i was thinking in way that before run my script , evaluate which operating system that user use ubuntu or solaris , am using this because there is some differences in command option in each OS such as sed .. , i was trying the following : sysEval=`grep "ubuntu" | uname -a` if [ sysEval ]; then .......some command else ....... some command fi NOTE That my script will run only in ubuntu or solaris seems not working !

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• 12.0.4.1 Reboot before install

  - by Cory

  I'm trying to install 12.04.1 and after I choose install or live, it just goes to a blinking cursor or some text, then reboots the machine. I've tried nomodeset, alternate install, dvd install, and usb. Same problem with all of them. I've also tried unplugging unnecessary devices such as my webcam and 2nd monitor. Specs: gigabyte mobo AMD Phenom II 965 @ 3.7 4gb ddr2 1066 AMD Radeon HD 6870 Creative Sound Blaster X-fi xtreme gamer

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• Ruby Script Runner for Ubuntu Gedit

  - by Ygam

  I have this Java script runner installed in my gedit external tools: #!/bin/sh cd $GEDIT_CURRENT_DOCUMENT_DIR if javac $GEDIT_CURRENT_DOCUMENT_NAME; then java ${GEDIT_CURRENT_DOCUMENT_NAME%\.java} else echo "Failed to compile" fi I tried modifying to it to something like this #!/bin/sh cd $GEDIT_CURRENT_DOCUMENT_DIR ruby ${GEDIT_CURRENT_DOCUMENT_NAME%\.rb} but it doesn't work. I may have missed something, I don't know what because I don't do bash scripting. Hehe

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• The Alienware M11xR3 has arrived

  - by Enrique Lima

  A week or so ago, I mentioned my gear was evolving.  The newest member of my gear arrived yesterday, an Alienware M11xR3. Here are the specs: Intel Core i7-2617M 1.5GHz (2.6GHz Turbo Mode, 4MB Cache) NVIDIA GeForce GT540 graphics with 2.0GB Video Memory and Optimus 16GB Dual Channel DDR3 at 1333MHz 11.6in High Def (720p/1366x768) with WLED backlight 750GB 7200RPM SATA 3Gb/s Soundblaster X-Fi Hi Def Audio - Software Enabled Intel Advanced-N WiFi Link 6250 a/g/n 2x2 MIMO Technology with WiMax Gobi Mobile Broadband with GPS - supports ATT with contract Internal Bluetooth 3.0   Some pics from the unboxing event:

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• Only run CRON job if connected to specific wifi network

  - by Herbert

  I am a newbie to scripting on Linux (Lubuntu), but I would like to make a script that runs a cron job only if my laptop is connected to my home wifi. Is this possible? I guess, I could do something with iwconfig and pull the ESSID from there with grep? So far, I tried this and it seems to work: #!/bin/bash # CRON, connected to specific WIFI clear netid=HOFF216 if iwconfig | grep $netid then clear echo "True, we are connected to $netid" rsync ........... else clear echo "False, we are not connected to $netid" fi

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• Desktop Fun: Starships Wallpaper Collection Series 2

  - by Asian Angel

  The starships shown in our favorite sci-fi serials come in all shapes and sizes, serve different purposes, and make us yearn to have one to call our own. Travel among the stars on your desktop with the second in our series of Starships Wallpaper collections. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• More elegant way to avoid hard coding the format of a a CSV file?

  - by dsollen

  I know this is trivial issue, but I just feel this can be more elegant. So I need to write/read data files for my program, lets say they are CSV for now. I can implement the format as I see fit, but I may have need to change that format later. The simply thing to do is something like out.write(For.getValue()+","+bar.getMinValue()+","+fi.toString()); This is easy to write, but obviously is guilty of hard coding and the general 'magic number' issue. The format is hard-coded, requires parsing of the code to figure out the file format, and changing the format requires changing multiple methods. I could instead have my constants specifying the location that I want each variable to be saved in the CSV file to remove some of the 'magic numbers'; then save/load into the an array at the location specified by the constants: int FOO_LOCATION=0; int BAR_MIN_VAL_LOCATION=1; int FI_LOCATION=2 int NUM_ARGUMENTS=3; String[] outputArguments=new String[NUM_ARGUMENTS]; outputArguments[FOO_LOCATION] = foo.getValue(); outputArgumetns[BAR_MIN_VAL_LOCATION] = bar.getMinValue(); outptArguments[FI_LOCATOIN==fi.toString(); writeAsCSV(outputArguments); But this is...extremely verbose and still a bit ugly. It makes it easy to see the format of existing CSV and to swap the location of variables within the file easily. However, if I decide to add an extra value to the csv I need to not only add a new constant, but also modify the read and write methods to add the logic that actually saves/reads the argument from the array; I still have to hunt down every method using these variables and change them by hand! If I use Java enums I can clean this up slightly, but the real issue is still present. Short of some sort of functional programming (and java's inner classes are too ugly to be considered functional) I still have no obvious way of clearly expressing what variable is associated with each constant short of writing (and maintaining) it in the read/write methods. For instance I still need to write somewhere that the FOO_LOCATION specifies the location of foo.getValue(). It seems as if there should be a prettier, easier to maintain, manner for approaching this? Incidentally, I'm working in java at the moment, however, I am interested conceptually about the design approach regardless of language. Some library in java that does all the work for me is definitely welcome (though it may prove more hassle to get permission to add it to the codebase then to just write something by hand quickly), but what I'm really asking is more about how to write elegant code if you had to do this by hand.

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• Team seeks collaboration for 2D action adventure RPG

  - by AlchemicTempest

  not entirely sure if it's appropriate to post this here, but I'll try: We are looking for all kinds of game dev interested people for our 2D sci-fi action adventure rpg "Quantum Nucleus" This is voluntary collaboration. We are seeking programmers(Java), artists, designers, audio people and writers So basically all kinds of people. Please watch our video, for further information: Video Link Thanks ! :D http://www.Alchemic-Tempest.com

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• read file in shell script

  - by moata_u

  how can i read file in shell script , then assign each line to an variable that i can use later ,,,(am thinking in way to load an default setting from file) i already try : process (){ } FILE='' read -p "Please enter name of default file : " FILE if [ ! -f $FILE ]; then echo "$FILE : does not exists " exit 1 elif [ ! -r $FILE ]; then echo "$FILE : can not read " fi exec 0<"$FILE" n=0 while read -r line do (assign each line to an variable) done

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• How to Detect and Fix Table Corruption in Oracle?

  Oracle is an RDBMS (Relational Database Management System), developed and marketed by Oracle Corporation. It has a major presence in database computing. It stores all your valuable data in the DBF fi... [Author: Mark Willium - Computers and Internet - May 13, 2010]

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• How can I automatically restart Apache and Varnish if can't fetch a file?

  - by Tyler

  I need to restart Apache and Varnish and email some logs when the script can't fetch robots.txt but I am getting an error ./healthcheck: 43 [[: not found My server is Ubuntu 12.04 64-bit #!/bin/sh # Check if can fetch robots.txt if not then restart Apache and Varnish # Send last few lines of logs with date via email PATH=/bin:/usr/bin THEDIR=/tmp/web-server-health [email protected] mkdir -p $THEDIR if ( wget --timeout=30 -q -P $THEDIR http://website.com/robots.txt ) then # we are up touch ~/.apache-was-up else # down! but if it was down already, don't keep spamming if [[ -f ~/.apache-was-up ]] then # write a nice e-mail echo -n "Web server down at " > $THEDIR/mail date >> $THEDIR/mail echo >> $THEDIR/mail echo "Apache Log:" >> $THEDIR/mail tail -n 30 /var/log/apache2/error.log >> $THEDIR/mail echo >> $THEDIR/mail echo "AUTH Log:" >> $THEDIR/mail tail -n 30 /var/log/auth.log >> $THEDIR/mail echo >> $THEDIR/mail # kick apache echo "Now kicking apache..." >> $THEDIR/mail /etc/init.d/varnish stop >> $THEDIR/mail 2>&1 killall -9 varnishd >> $THEDIR/mail 2>&1 /etc/init.d/varnish start >> $THEDIR/mail 2>&1 /etc/init.d/apache2 stop >> $THEDIR/mail 2>&1 killall -9 apache2 >> $THEDIR/mail 2>&1 /etc/init.d/apache2 start >> $THEDIR/mail 2>&1 # prepare the mail echo >> $THEDIR/mail echo "Good luck troubleshooting!" >> $THEDIR/mail # send the mail sendemail -o message-content-type=html -f [email protected] -t $EMAIL -u ALARM -m < $THEDIR/mail rm ~/.apache-was-up fi fi rm -rf $THEDIR

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• tomcat 5.5 startup script on Ubuntu server

  - by Registered User

  Can any one share their Tomcat startup script I am looking for a tomcat start up script on a Ubuntu machine. My Ubuntu is 10.04 server. The tomcat is 5.5.30. It is in /opt/apache-tomcat-5.5.31 I tried a script #!/bin/bash # # tomcat # # chkconfig: # description: Start up the Tomcat servlet engine. # Source function library. . /lib/lsb/init-functions RETVAL=$? CATALINA_HOME="/opt/apache-tomcat-5.5.31" case "$1" in start) if [ -f $CATALINA_HOME/bin/startup.sh ]; then echo $"Starting Tomcat" /opt/apache-tomcat-5.5.31/bin/startup.sh fi ;; stop) if [ -f $CATALINA_HOME/bin/shutdown.sh ]; then echo $"Stopping Tomcat" /opt/apache-tomcat-5.5.31/bin/shutdown.sh fi ;; *) echo $"Usage: $0 {start|stop}" exit 1 ;; esac exit $RETVAL but it did not worked after a reboot. But the same script works if I do /etc/init.d/tomcat start or /etc/init.d/tomcat stop I have done update-rc.d tomcat defaults as it is a Ubuntu server but on reboot all of this fails to work.

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• Postgresql base backup script

  - by Terry Lorber

  I'm using the following script to do a file-level backup of Postgresql. I sometimes see that the last part, to do cleanup after "pgs_backup_stop" is called, hangs while it waits for the last WAL to be created. The REF_FILE to search for is sometimes wrong. I'm also shipping these files to a different machine, every 5 minutes via rsync. What do other people do to safely remove old WAL files? #!/bin/bash PGDATA=/usr/local/pgsql/data WAL_ARCHIVE=/usr/local/pgsql/archives PGBACKUP=/usr/local/pgsqlbackup PSQL=/usr/local/pgsql/bin/psql today=`date +%Y%m%d-%H%M%S` label=base_backup_${today} echo "Executing pg_start_backup with label $label in server ... " CP=`$PSQL -q -Upostgres -d template1 -c "SELECT pg_start_backup('$label');" -P tuples_only -P format=unaligned` RVAL=$? echo "Begin CheckPoint is $CP" if [ ${RVAL} -ne 0 ] then echo "PSQL pg_start_backup failed" exit 1; fi echo "pg_start_backup executed successfully" echo "TAR begins ... " pushd $PGBACKUP tar -cjf pgdata-$today.tar.bz2 --exclude='pg_xlog' $PGDATA/* popd echo "TAR completed" echo "Executing pg_stop_backup in server ... " $PSQL -Upostgres template1 -c "SELECT pg_stop_backup();" if [ $? -ne 0 ] then echo "PSQL pg_stop_backup failed" exit 1; fi echo "pg_stop_backup done successfully" TO_SEARCH="*${CP:0:2}000000${CP:3:2}.00${CP:5}" echo "Check for ${WAL_ARCHIVE}/${TO_SEARCH}.backup" while [ ! -e ${WAL_ARCHIVE}/${TO_SEARCH}.backup ]; do echo "Waiting for ${WAL_ARCHIVE}/${TO_SEARCH}.backup" sleep 1 done REF_FILE="`echo ${WAL_ARCHIVE}/*${CP:0:2}000000${CP:3:2}`" echo "Reference file ${REF_FILE}" # "-not -newer" or "\! -newer" will also return REF_FILE # so you have to grep it out and use xargs; otherwise you # could also use the -delete action find ${WAL_ARCHIVE} -not -newer ${REF_FILE} -type f | grep -v "^${REF_FILE}$" | xargs rm -f REF_FILE="`echo ${PGBACKUP}/pgdata-$today.tar.bz2`" echo "Reference file ${REF_FILE}" find $PGBACKUP -not -newer ${REF_FILE} -type f -name pgdata* | grep -v "^${REF_FILE}$" | xargs rm -f

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• sequential SSH command execution not working in Ubuntu/Bash

  - by kumar

  My requirement is I will have a set of commands that needs to be executed in a text file. My Shell script has to read each command, execute and store the results in a separate file. Here is the snippet which does the above requirement. while read command do echo 'Command :' $command >> "$OUTPUT_FILE" redirect_pos=`expr index "$command" '>>'` if [ `expr index "$command" '>>'` != 0 ];then redirect_fn "$redirect_pos" "$command"; else $command state=$? if [ $state != 0 ];then echo "command failed." >> "$OUTPUT_FILE" else echo "executed successfully." >> "$OUTPUT_FILE" fi fi echo >> "$OUTPUT_FILE" done < "$INPUT_FILE" Sample Commands.txt will be like this ... tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt gzip /var/tmp/logs.tar rm -f /var/tmp/list.txt This is working fine for commands which needs to be executed in local machine. But When I am trying to execute the following ssh commands only the 1st command getting executed. Here are the some of the ssh commands added in my text file. ssh uname@hostname1 tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt ssh uname@hostname2 gzip /var/tmp/logs.tar ssh .. etc When I am executing this in cli it is working fine. Could anybody help me in this?

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• Bash mine script, please

  - by HomelyPoet

  The script, in and of its self, is fairly self-explanatory. Use if You so desire; any and all criticism wouldst be appreciated, as wouldst any suggestions for improvement. First iteration was writ upon OS X 10.5.8 Leopard, current iteration was run upon OS X 10.6.4 Snow Leopard with Safari 5.0.2 (6533.18.5). Also, any illumination as to why the first line ' if [ -f ] ' works, but ' if [ -f ~/Library/Safari/LocalStorage/*.localstorage ] ' generates an error? [yes, I am a bit of a Noob] Code: #! /bin/bash # SafariClear0.0.6 if [ -f ] then cat /dev/null > ~/Library/Safari/LocalStorage/*.localstorage rm -f ~/Library/Safari/LocalStorage/*.localstorage fi if [ -f ~/Library/Safari/LocalStorage/*.localstorage ] then echo "Oy vey!" fi cd ~/Library/Safari/ cat /dev/null > WebpageIcons.db cat /dev/null > TopSites.plist cat /dev/null > LocationPermissions.plist cat /dev/null > LastSession.plist cat /dev/null > History.plist echo "Clear" exit

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• How to disable auto insert notification in Windows 7?

  - by White Phoenix

  Alright, here's the problem. My hard drive activity light on my custom built PC is blinking exactly once every second. Microsoft has this to say on the issue: http://support.microsoft.com/kb/138598 There has been discussion on this issue several months ago: Why does my hard drive LED light blink every second? The problem seems to stem from primarily Windows 7 polling the CD-ROM/DVD drive every second to see if something is inserted. The Windows 7 users in the thread that was linked in the superuser question, https://social.technet.microsoft.com/Forums/fi-FI/w7itprohardware/thread/4f6f63b3-4b58-4154-9298-1566100f9d00, have confirmed that this IS a known issue with Windows 7. Some people point at the motherboard circuitry causing the CD-ROM and SATA activity to both be linked to that hard drive activity, but whatever the case, the temporary solution seems to be to disable the CD/DVD-ROM drive in Device Manager. In fact, disabling the CD/DVD-ROM does stop the blinking, but of course this solution is counterproductive, because I shouldn't have to entirely disable a device to fix this problem. I've done the following suggestions in that thread: Change the autorun registry entry to 0 Completely disable autoplay in the autoplay control panel Disable autoplay in the Local Group Policy Editor. None of these stop the blinking from happening - apparently these solutions work for both XP and Vista, but it seems to be different in Windows 7. So I'm wondering if anyone has found out how to completely disable the polling in Windows 7, or if this will just have to be an issue we will have to deal with. There's no option to disable the auto insert notification when you go to the device within device manager (there was in XP), so I got no idea where this option is hidden, or if there's a registry key entry I could change to stop the polling. Anyone have any idea?

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• Vmware Workstation downloads as a txt file?

  - by George Mauer

  I just went to the vmware website because I want to try workstation over virtualbox. I signed up for a workstation trial and clicked download on the 64bit linux version. What downloaded is a 320 megabyte txt file VMware-Workstation-Full-8.0.2-591240.x86_64.txt What gives? Is anyone familiar with this pattern of delivering software? How do I run it? Here is the beginning of that file: #!/usr/bin/env bash # # VMware Installer Launcher # # This is the executable stub to check if the VMware Installer Service # is installed and if so, launch it. If it is not installed, the # attached payload is extracted, the VMIS is installed, and the VMIS # is launched to install the bundle as normal. # Architecture this bundle was built for (x86 or x64) ARCH=x64 if [ -z "$BASH" ]; then # $- expands to the current options so things like -x get passed through if [ ! -z "$-" ]; then opts="-$-" fi # dash flips out of $opts is quoted, so don't. exec /usr/bin/env bash $opts "$0" "$@" echo "Unable to restart with bash shell" exit 1 fi set -e ETCDIR=/etc/vmware-installer OLDETCDIR="/etc/vmware" ### Offsets ### # These are offsets that are later used relative to EOF. FOOTER_SIZE=52 # This won't work with non-GNU stat. FILE_SIZE=`stat --format "%s" "$0"` offset=$(($FILE_SIZE - 4)) MAGIC_OFFSET=$offset offset=$(($offset - 4)) CHECKSUM_OFFSET=$offset offset=$(($offset - 4)) VERSION_OFFSET=$offset offset=$(($offset - 4)) PREPAYLOAD_OFFSET=$offset

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• Not able to find scripts present in /etc/profile.d directory [on hold]

  - by priya

  I am using Red Hat Linux 6.0 ... using davinchi board. I have to change system clock resolution so I am changing (HZ) env var. For this I have written script so that I can change HZ = 1000 n insert that script in /etc/profile.d and write code for loop in /etc/profile so that while running as usual /etc/profile can load the scripts present in /etc/profile.d. But when I am logging into the system at root level then showing error as "-bash: ./etc/profile.d/resolution.sh(my script name): No such file or directory Also here why it is showing ./etc and not /etc . Is something related to that?? Also I tried to add script in /etc/init.d but still no change in value of HZ takes place. Please tell where to change so that this env var can get changed. The script(resolution.sh) written has :- #!/bin/bash export HZ=1000 The content of /etc/profile which I entered is: if [ -d /etc/profile.d ]; then for i in /etc/profile.d/*.sh; do if [ -r $i ]; then .$i fi done unset i fi And the output of grep command is -rw-r--r-- 1 root root 535 Feb 4 2004 profile -rwxr-xr-x 2 root root 4096 Feb 2 2004 profile.d

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• init.d script runs correctly but process doesn't live when booted fully up

  - by thetrompf

  I have a problem with an init.d script #!/bin/bash ES_HOME="/var/es/current" PID=$(ps ax | grep elasticsearch | grep $ES_HOME | grep -v grep | awk '{print $1}') #echo $PID #exit 0 case "$1" in start) if [ -z "$PID" ]; then echo "Starting Elasticsearch" echo "Starting Elasticsearch" /var/tmp/elasticsearch su -m elasticsearch -c "${ES_HOME}/bin/elasticsearch" exit 0; else echo "Elasticsearch already running" echo "Elasticsearch already running" /var/tmp/elasticsearch exit 0; fi ;; stop) if [ -n "$PID" ]; then echo "Stopping Elasticsearch" kill ${PID} echo "Stopped Elasticsearch" exit 0; else echo "Elasticsearch is not running" exit 0; fi ;; esac The scripts runs just file, as I can see in /var/tmp/elasticsearch a new line is added after every boot, but if I run: /etc/init.d/elasticsearch stop Just after the server is booted, I get "Elasticsearch is not running", ergo somehow the process does not stay alive. My question is why? and what am I doing wrong? Thanks in advance.

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• Solr startup script problem

  - by Camran

  I have installed solr and it works finally... I have now problems setting it up to start automatically with a start command. I have followed a tutorial and created a file called solr in the /etc/init.d/solr dir... Here is that file: #!/bin/sh -e # SOLR auto-start # # description: auto-starts solr engine # processname: solr-production # pidfile: /var/run/solr-production.pid NAME="solr" PIDFILE="/var/run/solr-production.pid" LOG_FILE="/var/log/solr-production.log" SOLR_DIR="/etc/jetty" JAVA_OPTIONS="-Xmx1024m -DSTOP.PORT=8079 -DSTOP.KEY=stopkey -jar start.jar" JAVA="/usr/bin/java" start() { echo -n "Starting $NAME... " if [ -f $PIDFILE ]; then echo "is already running!" else cd $SOLR_DIR $JAVA $JAVA_OPTIONS 2> $LOG_FILE & sleep 2 echo `ps -ef | grep -v grep | grep java | awk '{print $2}'` > $PIDFILE echo "(Done)" fi return 0 } stop() { echo -n "Stopping $NAME... " if [ -f $PIDFILE ]; then cd $SOLR_DIR $JAVA $JAVA_OPTIONS --stop sleep 2 rm $PIDFILE echo "(Done)" else echo "can not stop, it is not running!" fi return 0 } case "$1" in start) start ;; stop) stop ;; restart) stop sleep 5 start ;; *) echo "Usage: $0 (start | stop | restart)" exit 1 ;; esac Whenever I do solr -start I get this error: "Error occurred during initialization of VM Could not reserve enough space for object heap" I think this is because of the file above... Also here is where I have solr installed: var/www/solr and here is the start.jar file located: var/www/start.jar Help me out if you know whats causing this. Thanks BTW: OS is ubuntu 9.10

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• Upstart can't determine my process' pid

  - by sirlark

  I'm writing an upstart script for a small service I've written for my colleagues. My upstart job can start the service, but when it does it only outputs queryqueue start/running; note the lack of a pid as given for other services. #/etc/init/queryqueue.conf description "Query Queue Daemon" author "---" start on started mysql stop on stopping mysql expect fork env DEFAULTFILE=/etc/default/queryqueue umask 007 kill timeout 30 pre-start script #if [ -f "$DEFAULTFILE" ]; then # . "$DEFAULTFILE" #fi [ ! -f /var/run/queryqueue.sock ] || rm -rf /var/run/queryqueue.sock #exec /usr/local/sbin/queryqueue -s /var/run/queryqueue.sock -d -l /tmp/upstart.log -p $PIDFILE -n $NUM_WORKERS $CLEANCACHE $FLUSHCACHE $CACHECONN end script script #Originally this stanza didn't exist at all if [ -f "$DEFAULTFILE" ]; then . "$DEFAULTFILE" fi exec /usr/local/sbin/queryqueue -s /var/run/queryqueue.sock -d -l /tmp/upstart.log -p $PIDFILE -n $NUM_WORKERS $CLEANCACHE $FLUSHCACHE $CACHECONN end script post-start script for i in `seq 1 5` ; do [ -S /var/run/queryqueue.sock ] && exit 0 sleep 1 done exit 1 end script The service in question is a python script, which when run without error, forks using the code below right after checking command line options and basic environmental sanity, so I tell upstart to expect fork. pid = os.fork() if pid != 0: sys.exit(0) The script is executable, and has a python shebang. I can send the TERM signal to the process manually, and it quits gracefully. But running stop queryqueue claims queryqueue stop/waiting but the process is still alive and well. Also, it's logs indicate it never received the kill signal. I'm guessing this is because upstart doesn't know which pid it has. I've also tried expect daemon and leaving the expect clause out entirely, but there's no change in behaviour. How can I get upstart to determine the pid of the exec'd process

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• Hadoop initscript askes password

  - by Ramesh

  I have installed hadoop on my ubuntu 12.04 single node .I am trying to execute an init script to make the hadoop run on start up but it asks password every time i execute. #!/bin/sh ### BEGIN INIT INFO # Provides: hadoop services # Required-Start: $network # Required-Stop: $network # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Description: Hadoop services # Short-Description: Enable Hadoop services including hdfs ### END INIT INFO PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin HADOOP_BIN=/home/naveen/softwares/hadoop-1.0.3/bin NAME=hadoop DESC=hadoop USER=naveen ROTATE_SUFFIX= test -x $HADOOP_BIN || exit 0 RETVAL=0 set -e cd / start_hadoop () { set +e su $USER -s /bin/sh -c $HADOOP_BIN/start-all.sh > /var/log/hadoop/startup_log case "$?" in 0) echo SUCCESS RETVAL=0 ;; 1) echo TIMEOUT - check /var/log/hadoop/startup_log RETVAL=1 ;; *) echo FAILED - check /var/log/hadoop/startup_log RETVAL=1 ;; esac set -e } stop_hadoop () { set +e if [ $RETVAL = 0 ] ; then su $USER -s /bin/sh -c $HADOOP_BIN/stop-all.sh > /var/log/hadoop/shutdown_log RETVAL=$? if [ $RETVAL != 0 ] ; then echo FAILED - check /var/log/hadoop/shutdown_log fi else echo No nodes running RETVAL=0 fi set -e } restart_hadoop() { stop_hadoop start_hadoop } case "$1" in start) echo -n "Starting $DESC: " start_hadoop echo "$NAME." ;; stop) echo -n "Stopping $DESC: " stop_hadoop echo "$NAME." ;; force-reload|restart) echo -n "Restarting $DESC: " restart_hadoop echo "$NAME." ;; *) echo "Usage: $0 {start|stop|restart|force-reload}" >&2 RETVAL=1 ;; esac exit $RETVAL Please tell me how to run hadoop without entering password.

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• Test script if host is back online

  - by brubelsabs

  E.g. system: Ubuntu/Debian. As many of you do this probably via ping and a terminal, I always forget this terminal when switching to other task... So a noftification popup would be useful. So can I do better as this?: while; do if ping -c 1 your.host.com; expr $? = 0; then notify-send "your.host.com back online"; sleep 30s; else sleep 30s; fi; done You will need zsh and libnotify to let the snippet work. As script: #!/usr/bin/env zsh while; do if ping -c 1 $1; expr $? = 0; then notify-send "$1 back online"; sleep 30s; else sleep 30s; fi; done

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