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• Untar with date filter

  - by Don

  Is there any way to untar and only extract those files that are above a certain date including directory structure?? I restored a backup on a play server but it was a few days old. However I have a tar archive of the entire structure that is more up to date and healthy so now I want to extract all files (including directory structure) based on a date filter on the files if possible?

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• Resolve `strace` file number to a filename

  - by Mike Pennington

  I am debugging a problem where MoinMoin on CentOS is throwing a permissions error, but I can't track down where the problematic file / directory is. I ran strace -vp <pid> on the apache pid; when I have the problem I see this: epoll_wait(10, {{EPOLLIN, {u32=3487534344, u64=140367313734920}}}, 2, 10000) = 1 accept4(6, {sa_family=AF_INET6, sin6_port=htons(52621), inet_pton (AF_INET6, "::ffff:105.193.30.91", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28], SOCK_CLOEXEC) = 11 ## Later on... read(7, 0x7fffa658ad7f, 1) = -1 EAGAIN (Resource temporarily unavailable) However, since apache is already running, I see no corresponding open() on the file referred to as 7; thus I see the permissions problem, but I still don't know which file is the problem. I know I could try to catch all the file opens when I respawn apache, but I'm hoping there is a way to map file 7 to a real filename... is there a way to do this?

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• /var/tmp and file lifetime

  - by clorz

  Hi everyone I've got a cronjob that runs every minute and checks existence of a certain file. If there's no such file, job silently ends. If there is a file, then another script is started. That script removes the file when done. Its execution time can take up to 20 minutes. My questions are: Are there any flaws in this scheme? Is it ok to store such file in tmp? Can I be shure that nothing will attempt to remove it?

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• How hard is it to use SELinux?

  - by Bill Drissel

  How hard is it to use SELinux?

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• Is it inefficient to have symbolic links to symbolic links?

  - by Ogre Psalm33

  We're setting up a series of Makefiles where we want to have a project-level include directory that will have symbolic links to sub-project-level include files. Many sub-project developers have chosen to have their include files also be symbolic links to yet another directory where the actual software is located. So my question is, is it inefficient to have a symbolic link to a symbolic link to another file (for, say, a C++ header that may be included dozens or more times during a compile)? Example directory tree: /project/include/ x_header1.h -> /project/src/csci_x/include/header1.h x_header2.h -> /project/src/csci_x/include/header2.h /project/src/csci_x/ include/ header1.h -> /project/src/csci_x/local_1/cxx/header1.h header2.h -> /project/src/csci_x/local_2/cxx/header2.h local_1/cxx/ module1.cpp header1.h local_2/cxx/ module2.cpp header2.h

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• Fastest reliable way to open the terminal?

  - by meder

  I actually had my SUPER_L ( left windows key ) binded to gnome-terminal, but for whatever reason ever since upgrading to 9.04 Ubuntu from 8.10 Intrepid it seemed to break the key binding. It was very handy because I could throw open the terminal with one key ( sorry but alt-f2 and typing gnome-terminal isn't practical for me ). Or perhaps it reset all the keybindings? I remember using xev and some gui type interface that was akin to Win32 registry editor. Anyway, I'm curious as to what you guys use to open the terminal.

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• Audio organizing via CLI

  - by Radek Šimko

  I'm looking for some software for my OpenSUSE, which with I would be able to organize my audio files. I've found one, which may be good, but it's unable to run without X server (in CLI). http://musicbrainz.org/doc/MusicBrainz_Picard I'm not looking for ID3 renamers. There're maybe hundreds of them... I'm looking for software, which has its own database, or is able to communicate with some database, like CDDB, Gracenote, last.fm etc.

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• How to verify TRIM/discard on encrypted swap?

  - by svarni

  I am using an encrypted swap partition via ecryptfs-setup-swap on my Ubuntu 13.04 computer using a SSD. I have manually set up trim for my ext4 root partition (simply by adding the "discard" option in /etc/fstab). I also manually ran fstrim on the root partition prior to booting and using dstat I saw that for a few seconds several GB/s of data have been written to the disk. That was presumably the effect of the trim command. These high writerates are reproducable by deleting huge files and have not occured before setting up trim, so I take them as evidence for working trim/discard. Manually enabling trim on my root partition has stopped the wearout of my precious new disk from 365 used reserved blocks (out of 6176 total) within three months down to 0 additional used reserved blocks within three additional months (data from SMART attributes). Because I want to minimize the wearout of my SSD I now would like to know whether my swap partition (which is encrypted using ecryptfs-setup-swap) also makes use of the trim/discard option. I tried sudo swapon -d -v /dev/mapper/cryptswap1 but did not receive particular information ("-v") about whether trim/discard ("-d") was applied. If unsupported, i would expect a message. Then I tried sudo dd if=/dev/sda6 count=1 BS=1M | xxd | less directly after booting and when no swapspace was used but I saw not only zeroes. I assume, when looking at freshly trimmed regions, the disk would send zeroes instead of reading random sectors (and according to some forums, (unencrypted) swap space is trimmed once upon boot). Long story short: Are there any ideas on how to test if trim is effectively used for my encrypted swap? And if not, any ideas on how to - at least manually, for once - trim the whole swap space? I wouldn't want to tinker with the partition itself, because I dont know if it needs to be reinitialized as (encrypted) swap - I dont want to be left with an unbootable system :)

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• How to secure postfix to find out whether the emails are coming really from the sender?

  - by codeworxx

  Is it possible to secure postfix in a way, that incoming emails are checked on whether the email comes really from the sender? Is that possible to write php script and chose a sender, like the mail is really coming from the sender and what are the possibilities for postfix to find out that this mail is not actually coming from the real sender? What I have found out and activated are the options smtpd_sender_restrictions = reject_unknown_sender_domain unknown_address_reject_code = 554 smtpd_client_restrictions = reject_unknown_client unknown_client_reject_code = 554 Please mention, whether I have missed out on any points!

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• Rails /tmp/cache/assets permissions issue using Debian virtual machine hosted on OS X Lion

  - by Jim

  I am running Parallels Desktop 7 on OS X Lion. I have a VM with Debian installed, and inside that VM I setup a Rails development environment. I am using Parallels Tools to share out my OS X home directory to the VM - the goal here is to run the Rails server on the VM, but host the files on OS X (so they are automatically backed up, and so I can use tools like Textmate to develop with). Everything seems to work with the shared directory - my Debian user can read, write, and execute files. However, when I cloned a recent Rails project from Git, I got an error message when it tried to compile the CSS assets. My symptoms are exactly the same as in the question: http://stackoverflow.com/questions/7556774/rails-sprocket-error-compiling-css-assest-chown-issue I believe this is permissions-based, but it is really weird. My entire Rails project directory has permissions set to 777 and my Debian user owns it. If I navigate into /tmp/cache/assets, those permissions are the same. However, the three-character directories Rails is creating (DCE, DA1, D05, etc...) are being created without write permissions! If I refresh the Rails page a few times, about 4 or 5 (with Rails creating new three-character directories every time), eventually it will create one of the directories with the proper 777 permissions and everything will work! This will persist until I make a change to the CSS files and it has to recompile. Does anyone have any idea what might be going on here? I can't fathom why it is creating temp directories with incorrect permissions, or why after a few refreshes the good permissions kick in and it works... It definitely seems to be an issue with the share, since if I move the project into a different directory on the VM, it seems to work fine. On the OS X side, I've given the shared folder 777 permissions as well, but no dice...any ideas? Update I've found that the number of times I need to refresh before it works is not random - it has to do with how many assets are being compiled. For example, if I edit one of my CSS files, and there are four CSS files in the app/assets/stylesheets directory, I have to refresh four times before the app will finally work without the operation not permitted error...

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• Size of modules within initrd

  - by LiKao

  I am currently trying to manually replace the kernel within ubuntu-core on an embedded device with a custom kernel. However when I try to update the initrd my initrd becomes much bigger. Here is what I did: Extract the initrd that was shipped with ubuntu Make a list of all modules within the old initrd get the same modules from the new module director at /lib/modules/new_kernel_version add these modules to the initrd and remove the old ones If I do this my initrd becomes quite bigger than the original one, so I checked the individual modules. I picked the btrfs.ko filesystem driver as an example. So by comparing these two modules I noticed the one I just picked into the initrd was much bigger, which caused the difference in size. -rw-r--r-- 1 root root 999K Nov 14 15:06 btrfs.ko For the btrfs.ko within the shipped initrd. -rw-r--r-- 1 root root 7.2M Nov 14 15:08 btrfs.ko For the new btrfs.ko. What is different between these two modules? Could this be caused by some faulty setting for the new kernel? When producing the kernel I copied /proc/config.gz and used make oldconfig to update it, so all optimisations should be the same for both kernels. Or is there something else which is being done to the modules before they are put into the initrd? Maybe is there even some better way to build a new initrd for the new kernel in ubuntu altogether. Update: I just also tested with an initrd which I created from scratch using the mkinitrfs command within ubuntu, and it has the same size difference that I found for the initrd I manually updated.

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• Does Gedit have cool keyboard shortcuts?

  - by Kelp

  I have used Vim before and I love the keyboard shortcuts, but I hate having to copy and paste, so I am looking for a text editor that makes it easier. I have been trying Gedit. It's cool. But I really miss the being to create a new line, going to the end of the line, going to the beginning of the line, deleting a line with keyboard shortcuts. I tried to look up "gedit keyboard shortcuts" but all it came up with was how to save a file. Basic things.

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• pdflush hanging on Amazon EBS drives when using multi-GB files - any workaround?

  - by rhh

  Hello, When I run gunzip on a 1.7GB file (which generates an 8GB file) on an EBS volume, pdflush freezes after gunzip runs and the CPU hangs indefinitely at 100% IO Wait. Here's the output from 'ps aux | grep pdflush'. Note the D status root 87 0.0 0.0 0 0 ? D 06:18 0:00 pdflush root 88 0.0 0.0 0 0 ? D 06:18 0:00 pdflush The only solution is to kill the pdflush processes. The processes don't die immediately either. This problem is repeatable and happens with new instances. I'm running 2xlarge instances and I have way more RAM free than is being used (i.e. /proc/meminfo shows 20+GB MemFree) Has anyone found a workaround to this problem in the past? Thanks for any thoughts. Robert

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• No rule to make target libmysql.c', needed bylibmysql.lo'. Stop

  - by user1711008

  I install mysql5.1.53, run #./configure is well, but run #make have this error. My system is centos5.8, gcc version 4.1.2 20080704 (Red Hat 4.1.2-52) make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql' make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql' Making all in libmysql_r make[1]: Entering directory /root/soft/mysql-5.1.53/libmysql_r' make all-am make[2]: Entering directory/root/soft/mysql-5.1.53/libmysql_r' make[2]: * No rule to make target libmysql.c', needed bylibmysql.lo'. Stop. make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql_r' make[1]: *** [all] Error 2 make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql_r' make: * [all-recursive] Error 1

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• How do I symlink binaries under /usr/local/util to the default searchable /bin ?

  - by apache

  There are multiple binaries under /usr/local/util so I don't want to do it by running ln -s /bin/util_i /usr/local/util/util_i multiple times. Anyway,what I want to achieve is that I don't need to type /usr/local/util/ to run binaries under it.

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• How to search a text file for strings between two tokens in Ubuntu terminal and save the output?

  - by Blue

  How can I search a text file for this pattern in Ubuntu terminal and save the output as a text file? I'm looking for everything between the string "abc" and the string "cde" in a long list of data. For example: blah blah abc fkdljgn cde blah blah blah blah blah blah abc skdjfn cde blah In the example above I would be looking for an output such as this: fkdljgn skdjfn It is important that I can also save the data output as a text file. Can I use grep or agrep and if so, what is the format?

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• Is it safe to run two instances of svnserve on one repository, or only one?

  - by fredden

  We've two nodes running heartbeat/drbd, and one of the services we're using is subversion. What I want to know is: is it safe to run svnserve on both nodes all the time, or should it only run on the active node? Does svnserve use file-level locking, or is it all in memory? What are the implications of running svnserve without its repositories accessible? Please let me know if this isn't clear, and I'll try my best to rephrase/clarify. :)

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• How do you delete an iFolder from iFolder admin interface

  - by cheshirekow

  There are only two buttons at the bottom of the screen "enable" and "disable". When I check the box next to an iFolder one of them is lit (depending on what the state of the folder is)... but there is no button to delete the folder (as it seems there should be from the documentation). There is a delete button in the "orphaned" tab but how do you "orphan" an iFolder? I'm logged in to the admin interface as admin, who is currently the owner of the folder I wish to delete.

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• How to turn off ATI adapter on Acer Timeline 4810G with ubuntu 9.10

  - by netimen

  I can't turn off my ATI adapter. I have applied the fix, but still lspci | grep VGA gives 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 01:00.0 VGA compatible controller: ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] (rev ff) and my power consumption is about 15W (Wi-Fi on). I run ubuntu 9.10, kernel 2.6.31-14-generic. BIOS version 2.30

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• Nothing is written in php5-fpm.log

  - by jaypabs

  I have two servers which is Ubuntu 12.04 and Ubuntu 14.04. When I use Ubuntu 14.04 in my new server and enabled the php-fpm log file found under /etc/php5/fpm/php-fpm.conf that reads as follows: error_log = /var/log/php5-fpm.log I noticed that most of the log that I found in Ubuntu 12.04 is not written in 14.04. For example, if I restart php5-fpm in my Ubuntu 12.04, a restart log is being written, however, this does not happen in 14.04. Another log which I missed in 14.04 are the following: [23-Aug-2014 16:23:03] NOTICE: [pool web42] child 118098 exited with code 0 after 12983.480191 seconds from start [23-Aug-2014 16:23:03] NOTICE: [pool web42] child 147653 started [23-Aug-2014 17:27:31] WARNING: [pool web8] child 76743, script '/var/www/mysite.com/web/wp-comments-post.php' (request: "POST /wp-comments-post.php") executing too slow (12.923022 sec), logging I really wanted to have this kind of log so I will know the length of time a slow script has executed. Does anyone know if there are other settings in Ubuntu 14.04 that I need to change in addition to /etc/php5/fpm/php-fpm.conf?

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• umask is being ignored on Gentoo while creating new files

  - by drcelus

  I have a server running Gentoo and hosting a drupal installation. Whenever a Drupal update is executed, the directory permissions of the updated module turn from 755 to 744 preventing the application from accessing the files. The umask is defined as 022 under /etc/profile and the Apache server is running under user and group nobody. I believe this has nothing to do with the drupal installation since if I create a directory as root, the same happens, it is created with 744 permissions, since the umask is 022 shouldn't it be created as 755 ? Why is the umask being ignored and how do I tell the server to create the directories with permission 755 ?

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• How to Create Boot CD

  - by joe

  How to Create boot CD for Dual Booting System? Just consider I am having Windows and Ubuntu, Grup is boot loader. I just want to create Dual Boot CD for the same operation.

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• Triple-Boot + 4 partition Limit

  - by dsimcha

  I just bought a new hard drive so that I could convert my XP-only machine into an XP-Ubuntu-Windows 7 triple boot machine. Since the drive is absurdly huge (1 TB) I wouldn't mind throwing ReactOS into the mix, too. I just found out that master boot records are limited to 4 entries, meaning 4 primary partitions. I had Windows XP set up on my old drive as a boot partition, a program files partition and a media partition. Since I really didn't want to install XP from scratch, I cloned this setup on my new drive. This leaves me one MBR partition entry for installing Windows 7, Ubuntu and ReactOS. I'd like to avoid having to install XP from scratch like the plague, partly because it's supposed to be a safety net in case things go wrong with my other OS's and because I've invested a lot of time getting it set up exactly the way I like it. Here are the options I've considered and why I don't like them: Install Windows 7 on my media partition. This would work, but I prefer to keep my media partition completely separate from any OS, so that I can reformat an OS partition without affecting my media partition at all. Use wubi or something to install Ubuntu in the same partition as something else. Again, this is brittle. Move all my media to a logical drive on an extended partition. Create another logical drive on this extended partition for Ubuntu. The problem here is that extended partitions are rather brittle--if you nuke one, it renders the rest useless. Just put the old drive back in my computer and run XP off it. Use the new one for the other OS's. The problem here is that the old drive is slower and uses extra power, generates extra heat, etc. Can anyone suggest any other possibilities that I may have overlooked?

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