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  • linux/shell: change a file's modify timestamp relatively?

    - by index
    My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this. Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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  • installing a linux iso from within a university network

    - by pepperdreamteam
    In order to install gentoo, I need to connect to a university wireless internet network. It requires a username and password login/authentication. I'm wondering if anyone has any advice in terms of how to configure the internet connection. The Gentoo installation documentation recommends the use of net-setup, pppoe, pptp, dhcp and iwconfig. I can't figure out how to configure this connection, as the only way I understand is to select the network from a list and enter in authentication data from within a browser.

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  • Linux software RAID6: rebuild slow

    - by Ole Tange
    I am trying to find the bottleneck in the rebuilding of a software raid6. ## Pause rebuilding when measuring raw I/O performance # echo 1 > /proc/sys/dev/raid/speed_limit_min # echo 1 > /proc/sys/dev/raid/speed_limit_max ## Drop caches so that does not interfere with measuring # sync ; echo 3 | tee /proc/sys/vm/drop_caches >/dev/null # time parallel -j0 "dd if=/dev/{} bs=256k count=4000 | cat >/dev/null" ::: sdbd sdbc sdbf sdbm sdbl sdbk sdbe sdbj sdbh sdbg 4000+0 records in 4000+0 records out 1048576000 bytes (1.0 GB) copied, 7.30336 s, 144 MB/s [... similar for each disk ...] # time parallel -j0 "dd if=/dev/{} skip=15000000 bs=256k count=4000 | cat >/dev/null" ::: sdbd sdbc sdbf sdbm sdbl sdbk sdbe sdbj sdbh sdbg 4000+0 records in 4000+0 records out 1048576000 bytes (1.0 GB) copied, 12.7991 s, 81.9 MB/s [... similar for each disk ...] So we can read sequentially at 140 MB/s in the outer tracks and 82 MB/s in the inner tracks on all the drives simultaneously. Sequential write performance is similar. This would lead me to expect a rebuild speed of 82 MB/s or more. # echo 800000 > /proc/sys/dev/raid/speed_limit_min # echo 800000 > /proc/sys/dev/raid/speed_limit_max # cat /proc/mdstat md2 : active raid6 sdbd[10](S) sdbc[9] sdbf[0] sdbm[8] sdbl[7] sdbk[6] sdbe[11] sdbj[4] sdbi[3](F) sdbh[2] sdbg[1] 27349121408 blocks super 1.2 level 6, 128k chunk, algorithm 2 [9/8] [UUU_UUUUU] [=========>...........] recovery = 47.3% (1849905884/3907017344) finish=855.9min speed=40054K/sec But we only get 40 MB/s. And often this drops to 30 MB/s. # iostat -dkx 1 sdbc 0.00 8023.00 0.00 329.00 0.00 33408.00 203.09 0.70 2.12 1.06 34.80 sdbd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdbe 13.00 0.00 8334.00 0.00 33388.00 0.00 8.01 0.65 0.08 0.06 47.20 sdbf 0.00 0.00 8348.00 0.00 33388.00 0.00 8.00 0.58 0.07 0.06 48.00 sdbg 16.00 0.00 8331.00 0.00 33388.00 0.00 8.02 0.71 0.09 0.06 48.80 sdbh 961.00 0.00 8314.00 0.00 37100.00 0.00 8.92 0.93 0.11 0.07 54.80 sdbj 70.00 0.00 8276.00 0.00 33384.00 0.00 8.07 0.78 0.10 0.06 48.40 sdbk 124.00 0.00 8221.00 0.00 33380.00 0.00 8.12 0.88 0.11 0.06 47.20 sdbl 83.00 0.00 8262.00 0.00 33380.00 0.00 8.08 0.96 0.12 0.06 47.60 sdbm 0.00 0.00 8344.00 0.00 33376.00 0.00 8.00 0.56 0.07 0.06 47.60 iostat says the disks are not 100% busy (but only 40-50%). This fits with the hypothesis that the max is around 80 MB/s. Since this is software raid the limiting factor could be CPU. top says: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 38520 root 20 0 0 0 0 R 64 0.0 2947:50 md2_raid6 6117 root 20 0 0 0 0 D 53 0.0 473:25.96 md2_resync So md2_raid6 and md2_resync are clearly busy taking up 64% and 53% of a CPU respectively, but not near 100%. The chunk size (128k) of the RAID was chosen after measuring which chunksize gave the least CPU penalty. If this speed is normal: What is the limiting factor? Can I measure that? If this speed is not normal: How can I find the limiting factor? Can I change that?

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  • rm command and regular expressions via Linux BASH shell

    - by PeanutsMonkey
    I am attempting to use regular expressions to remove set of files however the bash shell returns the message rm: cannot remove `[0-99]+ -': No such file or directory rm: cannot remove `[a-zA-Z': No such file or directory rm: cannot remove `]+.[a-z]+': No such file or directory The command is [0-99]+\ - [a-zA-Z ]+\.[a-z]+ Questions Can I use regular expressions? If yes, how do I use them with commands such as rm, mkdir, etc

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  • How to make `rm` faster on ext3/linux?

    - by depesz
    I have ext3 filesystem mounted with default options. On it I have some ~ 100GB files. Removal of any of such files takes long time (8 minutes) and causes a lot of io traffic, which increases load on server. Is there any way to make the rm not as disruptive?

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  • linux is runing slow

    - by karan
    I am using open suse 11.3 .my laptop is running to slow and dmesg is showing following error: 733.162161] psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 5 bytes away. [ 774.230841] psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 2 bytes away. [ 856.344570] psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 1 bytes away. [ 898.451626] psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 1 bytes away. is there any way i could see the problem and solve it....

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  • Linux file permissions not being preserved

    - by yellavon
    I am deploying some custom software as root (a necessity for this situation). I set the owner/group to user1:user1 and set all the files to 644 beforehand in shell, then copy and deploy with ant. However, when files get copied over from the deployment directory, the ownership changes back to root and all the files install with 666 permissions. This seems to occur whether the file is overwritten or newly created. I believe there is a way to set an option in cp, mv commands to preserve permissions, but that would be a lot of commands to change. How can I fix this? Is there some setting I can change temporarily for root so the install always preserves the file permissions?

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  • Fetch MP3 ID3 tag under linux

    - by exic
    Hi, I have a few mp3 files which are not tagged. Winamp has a nice feature which I think is called "autotag" and which is very good at finding out artist and title for files. I'd like something like this for unix, so that I could possibly get artists and titles for my untagged files. Do you know some program which does this? Thanks.

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  • Question on date and timezone in Linux

    - by LinuxPenseur
    Hi , I did the date command and it gave the following output root@localhost:~$ date Thu Dec 30 14:19:47 UTC 2010 Then i modified the date using date -s command whichn gave the following output root@localhost:~$ date -s "12/30/2010 JST 14:19:47" Thu Dec 30 05:19:47 UTC 2010 I noticed that the time changed to 9 hours behind UTC time to show exactly the JST time. But timezone as you can see is still showing UTC. Why is it showing the correct time and incorrect timezone? Thanks

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  • Question about Linux Device Drivers.

    - by smwikipedia
    I have just installed the Xubuntu. My box runs quite slower than before when installed with a Win7. I am wondering if I am missing some device drivers. I can use gnome-device-manager to list my devices. In the device list view, I saw several blue question mark on the left side of devices. Based on my windows experience, the question mark should indicate the device is not properly configured. Is it the same with gnome-device-manager? And most importantly, how could I know for sure whether or not the corresponding device drivers have been installed? Many thanks.

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  • Linux user authentication with Microsoft LDAP

    - by TusharG
    I'm trying to do following things: Login to CentOS over ssh: authentication needs to happen with Microsoft Ldap On successful login create a home directory for user in /home if directory exists take him to his home directory Put quota on /home/user directory of 5 GB Can someone please show me a link for Centos/redhat to authorize users with Microsoft Ldap? I have already tried: setup command from root - "Authentication configuration" - "[] User Information - Use Ldap" - Authentication - [] Use Ldap Authentication" - []/[*] Use TLS - Server: ldap://corporate.company.com - Base DN: dc=corporate,dc=company,dc=com" This does not authentication users with Microsoft LDAP

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  • Linux USB/Serial port won't create a tty device in /dev

    - by Dave
    I am connecting a USB to serial driver port to my system and I get about halfway to where I need to go. When it is plugged in dmesg indicates: <6>usb 2-1: new full speed USB device using sl811-hcd and address 4 <6>usb 2-1: configuration #1 chosen from 1 choice and lsusb Bus 2 Device 4: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 2 Device 1: ID 0000:0000 Bus 1 Device 1: ID 0000:0000 I get a series of usbdev2.4 (usbdev2.4, usbdev2.4_ep00, etc) devices in dev but no ttyUSB0 or anything that I can open with minicom. How do I get the system to create the /dev device? Thanks Dave

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  • Mutual piping on linux

    - by user21919
    I would like the output of A to be input for B and at the same time the output of B to be the input for A, is that possible? I tried the naïve thing: creating named pipes for A (pipeA) and B (pipeB) and then: pipeB | A | pipeA & pipeA | B | pipeB & But that does not work (pipeB is empty and switching the order would not help either). Any help would be appreciated. Example: Command A could be compiled form of this C program: #include <stdio.h> int main() { printf("0\n"); int x = 0; while (scanf("%d", &x) != EOF) { printf("%d\n", x + 1); } return 0; } Command B could be compiled form of this C program: #include <stdio.h> int main() { int x = 0; while (scanf("%d", &x) != EOF) { printf("%d\n", x + x); } return 0; }

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  • How to prevent Linux from deleting temporary files on shutdown

    - by Rajorshi
    Hi, I am using Ubutu 10.04. I have some apps that create a few temporary files in /tmp/<file> as part of their shutdown process. I want to inspect those files when the apps are closed in the event of a system shutdown. However, when the system comes up again I find that all temporary files have been deleted. How can I ask the system not to clear the files in /tmp/ on shutdown?

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  • Audio and video streaming using Network Simulator in Linux

    - by Parth_90
    I am working on a project which is to show the simulation of streaming of audio and video data in wireless networks. I want to show the simulation that involves a base station, with few wireless stations. The base station should start sending data once it computes a certain value . On receiving the data, each wireless must begin communicating with the base station. I have gone through basic NS-2 tutorials from over here but I am not getting how to go about integrating it with my project. Can anyone tell me how to do it using NS2 or any other network simulator?

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  • linux "date -s" command not working to change date on a server

    - by nelaar
    date +%T --set="12:19:06" 12:19:06 date Mon Nov 26 12:37:32 SAST 2012 I have tried many different forms of this command but nothing seams to work. In changing the date on this computer server running as VM is not working. Our messages log show messages like thise ntpd[3496]: time correction of -1098 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time. Our server is now about 20 minutes out. It seams like our server has not been updating the time correctly for a few days. Nov 22 19:29:23 hostname ntpd[1818]: time reset -998.577519 s Nov 22 19:32:34 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:33:39 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 19:52:30 hostname ntpd[1818]: time reset -998.992426 s Nov 22 19:55:47 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:56:53 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:13:04 hostname ntpd[1818]: time reset -999.374412 s Nov 22 20:16:40 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:17:44 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:32:02 hostname ntpd[1818]: time reset -999.716832 s Nov 22 20:35:28 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:36:16 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:56:39 hostname ntpd[1818]: time correction of -1000 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time.

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  • More than 10k connections on linux vps

    - by Sash_007
    my question what is causing this and how to check? we use url masking script is the website..is it causing this?please help We could noticed that you are abusing our network, as you have made more than 10k connections in our node due to this our node became unstable and all of our customer faced down time because of your VPS. Please find the log details below for your reference. ============================== 593 src=199.231.227.56 dst=58.2.236.196 465 src=199.231.227.56 dst=192.223.243.6 396 src=199.231.227.56 dst=58.2.238.191 217 src=199.231.227.56 dst=58.2.236.197 161 src=199.231.227.56 dst=20.139.83.50 145 src=199.231.227.56 dst=192.223.163.6 136 src=199.231.227.56 dst=125.21.230.68 134 src=199.231.227.56 dst=125.21.230.132 131 src=199.231.227.56 dst=20.139.67.50 117 src=199.231.227.56 dst=110.234.29.210 112 src=199.231.227.56 dst=65.52.0.51 104 src=199.231.227.56 dst=202.46.23.55 100 src=199.231.227.56 dst=202.3.120.4 94 src=199.231.227.56 dst=117.198.39.22 69 src=203.197.253.62 dst=199.231.227.56 62 src=14.194.248.225 dst=199.231.227.56 53 src=199.231.227.56 dst=192.223.136.5 52 src=49.248.11.195 dst=199.231.227.56 51 src=199.231.227.56 dst=117.198.38.15 50 src=199.231.227.56 dst=192.71.175.2 47 src=199.231.227.56 dst=61.16.189.76 45 src=199.231.227.56 dst=122.177.222.17 43 src=199.231.227.56 dst=115.242.89.40 42 src=199.231.227.56 dst=103.22.237.215 41 src=125.16.9.2 dst=199.231.227.56 39 src=199.231.227.56 dst=117.198.35.90 38 src=199.231.227.56 dst=203.91.201.54 38 src=199.231.227.56 dst=14.139.241.89 38 src=199.231.227.56 dst=111.93.85.82 37 src=199.231.227.56 dst=65.52.0.56 Note: 1st column indicates the total number of connections to a particular IP. You have totally made more than 10k connections.

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  • Properly configuring Linux keyboard on my laptop

    - by antoniocs
    Hey! I have a ps/2 keyboard connected to an Acer Aspire 1694 WLMI via a ps/2 to usb converter. The laptop is running Ubuntu 9.04. The keyboard is a HP model number: SK-250C. I have configured in the 'Keyboard Preferences' the layout to HP SK-250x Multimedia Keyboard. The big problem is when I press certain keys (like for example the arrow keys) I get the 'Save Screenshot' dialog. This is really getting annoying, sometimes I am tying to write an address in browser and just want to go back a few letters and can't. There are other keys that trigger the dialog also (windows key, insert key, home key, page up and page down key, delete key, end key) All works fine If I use the laptop keyboard, but I really want to use the HP keyboard. EDIT: I was testing this and it seems that if I have the 'Num Lock' key turned off the keys work properly. Strange but true!!

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  • Creating zoom-pan video from a picture in Linux

    - by Pavel
    I would like to make a six second video using six images. Each second is sliding over one image from its top to its botom. Or some other motion effect – I would like to try several. I tried kdenlive Imagination Videoporama PhotoFilmStrip The first one has not enough settings (don't remember what exactly) and all those have rather poor quality – the resized picture is very "aliased" (like no quadratic filter was applied during resizing).

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  • Linux based Anti-virus for windows

    - by Manish Mathai
    Hi. I am currently running Windows XP along with Ubuntu 9.10. Is there any anti-virus which can scan for windows viruses , from ubuntu ? I had tried ClamAV sometime back. It didn't work very well. Is there any other alternative ? Preferably a free one :)

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  • How to create alternative linux boot without starting some services

    - by rics
    I would like to create an alternative booting possibility in my GRUB menu that does not start some services (listed by chkconfig) like cups. I would use this boot during travel where I surely does not need these services and shorter bootup time is preferable. Permanent removal of such services is not an option because I could not miss them during normal daily work. I use Mandriva 2010 with the latest updates.

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  • Running $ORIGIN linked binaries from setuid scripts on linux

    - by drscroogemcduck
    I'm using suidperl to run some programs that require root permissions. however, the runtime linker won't expand library paths which contain $ORIGIN entries so the programs i want to run (jstack from java) won't run. more info here There is one exception to the advice to make heavy use of $ORIGIN. The runtime linker will not expand tokens like $ORIGIN for secure (setuid) applications. This should not be a problem in the vast majority of cases. my program looks something like this: #!/usr/bin/perl $ENV{PATH} = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.6.0_12/bin:/root/bin"; $ENV{JAVA_HOME} = "/usr/java/jdk1.6.0_12"; open(FILE, '/var/run/kil.pid'); $pid = <FILE>; close(FILE); chomp($pid); if ($pid =~ /^(\d+)/) { $pid = $1; } else { die 'nopid'; } system( "/usr/java/jdk1.6.0_12/bin/jstack", "$pid"); is there any way to fork off a child process in a way so that the linker will work correctly.

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  • Linux - How to run Firefox with AT command

    - by conualfy
    I try to run a specified command on a desired time. I found at for this, and it seems to work fine if I run: echo "ls -al / > /home/florin/test.txt" | at 4:21am But I want to run a different thing: /usr/bin/firefox -new-tab http://google.ro I tried adapting the first line with my action (running it in terminal opens a new Firefox tab with http://google.ro, so the command is correct), but with at, it does not work: echo "firefox -new-tab http://google.ro" | at 4:23am The task seems to be scheduled, but it does not run. When running the previous line I get the default reply from at: warning: commands will be executed using /bin/sh Should my Firefox command be differently run in sh? Is there a way to do my action with at, or some other way? Thanks a lot!

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  • COnditional mount in LInux

    - by o_O Tync
    I have a mount point — let it be /media/question — and two possible devices: a physical HDD and a remote NFS folder. Sometimes I plug the device in physically, in other cases I mount it via NFS. Is there a way to specify both of them in fstab so that executing mount /media/question will preferably choose physical volume, and when it's not available — NFS?

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