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  • What does export do in BASH?

    - by Chas. Owens
    It is hard to admit, but I have never really understood what exactly export does to an environment variable. I know that if I don't export a variable I sometimes can't see it in child processes, but sometimes it seems like I can. What is really going on when I say export foo=5 and when should I not export a variable?

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  • git push not updating the cloned from repo

    - by dhaval
    I did the following git clone from another repo say Release1 made changes to cloned repo committed changes pushed changes to both master and Release1 pulled changes from cloned folder in Release1 status/log is showing my changes at both places The update is not reflected at Release1 What did I miss in the above steps? Both repo are in same server.

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  • How to deploy Java Web Application in Hostgator?

    - by Mujahid
    I have a Java Web application and I have a VPS hosting bought from Hostgator in which recently the tomcat has been installed. But I couldn't find a way to deploy my application and I talked with more than 3 Hostgator technical agents and none of them know how to deploy the Java application in tomcat in Hostgator server and they say they don't give support for hosting Java application. Does anyone have deployed any Java application in hostgator server? If you know please help me to host my application.

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  • "pull" process/job into the background

    - by Mustafa Ismail Mustafa
    I know of terminating a command with & and then moving it into the background by pressing Ctrl-Z and then bg [pid], and I also know of nohup. But say you started a process that turned out to take much longer than one expected, is there a way of pulling, so to speak, this process from another terminal screen into the background so that even if I log off from the server the process would continue?

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  • Exchange Server 2007 message tracking log tuning ?

    - by Albert Widjaja
    Hi All, what is the best practice if I want to have a retention of let say 6 months ? I'm confused which parameter that is should/can be changes. Get-ExchangeServer | where {$_.isHubTransportServer -eq $true} | Get-TransportServer | select Name, *MessageTracking* | ft -AutoSize Name MessageTrackingLogEnabled MessageTrackingLogMaxAge MessageTrackingLogMaxDirectorySize MessageTrackingLogMaxFileSize MessageTrackingLogPat h ---- ------------------------- ------------------------ ---------------------------------- ----------------------------- --------------------- ExHTServer1 True 20.00:00:00 250MB 10MB D:\Program Files\M... ExHTServer2 True 20.00:00:00 250MB 10MB D:\Program Files\M... ExHTServer3 True 20.00:00:00 250MB 10MB D:\Program Files\M... Thanks, Albert

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  • Can I disable comments by default on my YouTube videos?

    - by Philip Durbin
    Comments are unfortunately always automatically enabled when I upload a video to YouTube either via their website or iPhoto, but more often that not I later manually disable comments for each uploaded video by following the steps from the "comments on my videos" section of YouTube Help. I would much rather have comments automatically disabled, that is to say, disabled by default, for all of my uploaded videos. Is this possible? I couldn't find a setting for it.

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  • Can two Identical devices be present on the same bus in any PCI Topology

    - by vaibbhav
    As per the PCI standard, devices are identified on the basis of Vendor Id, Device Id and the bus no. All devices of same type have identical vendor id and device id. If I put two such devices on the same bus say bus 0. How will the PCI Software Subsystem distinguish between the two? If such a case is not possible in PCI, then can such thing be possible through PCI Express Switch?

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  • load-causing processes disappearing from "top" ps -o pcpu shows bogus numbers

    - by Alec Matusis
    I administer a large number of servers, and I have this problem only with Ubuntu 10.04 LTS: I run a server under normal load (say load average 3.0 on an 8-core server). The "top" command shows processes taking certain % of CPU that cause this load average: say PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 11008 mysql 20 0 25.9g 22g 5496 S 67 76.0 643539:38 mysqld ps -o pcpu,pid -p11008 %CPU PID 53.1 11008 , everything is consistent. The all of the sudden, the process causing the load average disappears from "top", but the process continues to run normally (albeit with a slight performance decrease), and the system load average becomes somewhat higher. The output of ps -o pcpu becomes bogus: # ps -o pcpu,pid -p11008 %CPU PID 317910278 1587 This happened to at least 5 different severs (different brand new IBM System X hardware), each running different software: one httpd 2.2, one mysqld 5.1, and one Twisted Python TCP servers. Each time the kernel was between 2.6.32-32-server and 2.6.32-40-server. I updated some machines to 2.6.32-41-server, and it has not happened on those yet, but the bug is rare (once every 60 days or so). This is from an affected machine: top - 10:39:06 up 73 days, 17:57, 3 users, load average: 6.62, 5.60, 5.34 Tasks: 207 total, 2 running, 205 sleeping, 0 stopped, 0 zombie Cpu(s): 11.4%us, 18.0%sy, 0.0%ni, 66.3%id, 4.3%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 74341464k total, 71985004k used, 2356460k free, 236456k buffers Swap: 3906552k total, 328k used, 3906224k free, 24838212k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 805 root 20 0 0 0 0 S 3 0.0 1493:09 fct0-worker 982 root 20 0 0 0 0 S 1 0.0 111:35.05 fioa-data-groom 914 root 20 0 0 0 0 S 0 0.0 884:42.71 fct1-worker 1068 root 20 0 19364 1496 1060 R 0 0.0 0:00.02 top Nothing causing high load is showing on top, but I have two highly loaded mysqld instances on it, that suddenly show crazy %CPU: #ps -o pcpu,pid,cmd -p1587 %CPU PID CMD 317713124 1587 /nail/encap/mysql-5.1.60/libexec/mysqld and #ps -o pcpu,pid,cmd -p1624 %CPU PID CMD 2802 1624 /nail/encap/mysql-5.1.60/libexec/mysqld Here are the numbers from # cat /proc/1587/stat 1587 (mysqld) S 1212 1088 1088 0 -1 4202752 14307313 0 162 0 85773299069 4611685932654088833 0 0 20 0 52 0 3549 27255418880 5483524 18446744073709551615 4194304 11111617 140733749236976 140733749235984 8858659 0 552967 4102 26345 18446744073709551615 0 0 17 5 0 0 0 0 0 the 14th and 15th numbers according to man proc are supposed to be utime %lu Amount of time that this process has been scheduled in user mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). This includes guest time, guest_time (time spent running a virtual CPU, see below), so that applications that are not aware of the guest time field do not lose that time from their calculations. stime %lu Amount of time that this process has been scheduled in kernel mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). On a normal server, these numbers are advancing, every time I check the /proc/PID/stat. On a buggy server, these numbers are stuck at a ridiculously high value like 4611685932654088833, and it's not changing. Has anyone encountered this bug?

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  • Can two Identical devices be present on the same bus in any PCI Topology

    - by vaibbhav
    As per the PCI standard, devices are identified on the basis of Vendor Id, Device Id and the bus no. All devices of same type have identical vendor id and device id. If I put two such devices on the same bus say bus 0. How will the PCI Software Subsystem distinguish between the two? If such a case is not possible in PCI, then can such thing be possible through PCI Express Switch?

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  • scp : file transfer

    - by lakshmipathi
    I missed typed by scp command - didn't give target remote directory. scp file root@remote-machine It didn't say any errors and I don't know whether file is transferred or not . what happened here?

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  • Deleting another user's diretories from my own

    - by kwatford
    I am a non-root user, and have made a directory into which other users in my group can write. The directory is setgid, so files and directories within it have the same group. I can delete files placed into this directory, but if a user creates a subdirectory with files in it, I can't seem to delete those. Is there something special I can do (other than, say, bothering the user in question or the sysadmin about it) to get rid of this subdirectory?

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  • JAVA_OPTS -XX:+PrintGCDetails affect on performance?

    - by brad
    Does anyone know if the PrintGCDetails affects java performance much? I've been monitoring our java garbage collecting on a staging server with the same setup as the production server. I assumed it was safe to say that I shouldn't have this enabled on production but I don't know if there's really any affect on performance.

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  • Apache: Limit the Number of Requests/Traffic per IP?

    - by Ian Kern
    I would like to only allow one IP to use up to, say 1GB, of traffic per day, and if that limit is exceeded, all requests from that IP are then dropped until the next day. However, a more simple solution where the connection is dropped after a certain amount of requests would suffice. Is there already some sort of module that can do this? Or perhaps I can achieve this through something like iptables? Thanks

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  • Powerpoint Action Settings

    - by Shyam
    In a PowerPoint presentation, how do I make an object (say a rectangle or a circle) to disappear when I click on it? I have more than one such objects in my presentation and I have a picture behind each of these. So, when I click an object, that object must disappear and the photo behind that should be displayed. How do I do it?

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  • Generate a limited amount of random network traffic between 2 hosts

    - by Andrew S
    I'm trying to find a utility that will allow me to generate a constant flow of random network traffic at a specified rate between 2 hosts. The utility needs to run on Windows and OSX. I've tried iperf but it seems to be more oriented toward short-term testing/statistics and it really taxes the CPU even at slower rates. I want something that will generate traffic for a few weeks at say 10Mbps while I use other tools to monitor the impact of that level of traffic on the network.

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  • Firefox: substitute a font with another in any page

    - by kemp
    I'm using the stylish addon and it works great. However I would like to substitute a specific font - say Arial - with another of my choice every time it is found instead of setting a global font (which I don't like as I just want to substitute Arial) or using a stylish rule for every page. Is it possible to do this? Maybe with a greasemonkey script?

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