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  • Binary files printing and desired precision

    - by yCalleecharan
    Hi, I'm printing a variable say z1 which is a 1-D array containing floating point numbers to a text file so that I can import into Matlab or GNUPlot for plotting. I've heard that binary files (.dat) are smaller than .txt files. The definition that I currently use for printing to a .txt file is: void create_out_file(const char *file_name, const long double *z1, size_t z_size){ FILE *out; size_t i; if((out = _fsopen(file_name, "w+", _SH_DENYWR)) == NULL){ fprintf(stderr, "***> Open error on output file %s", file_name); exit(-1); } for(i = 0; i < z_size; i++) fprintf(out, "%.16Le\n", z1[i]); fclose(out); } I have three questions: Are binary files really more compact than text files?; If yes, I would like to know how to modify the above code so that I can print the values of the array z1 to a binary file. I've read that fprintf has to be replaced with fwrite. My output file say dodo.dat should contain the values of array z1 with one floating number per line. I have %.16Le up in my code but I think that %.15Le is right as I have 15 precision digits with long double. I have put a dot (.) in the width position as I believe that this allows expansion to an arbitrary field to hold the desired number. Am I right? As an example with %.16Le, I can have an output like 1.0047914240730432e-002 which gives me 16 precision digits and the width of the field has the right width to display the number correctly. Is placing a dot (.) in the width position instead of a width value a good practice? Thanks a lot...

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  • How can I quickly parse large (>10GB) files?

    - by Andrew
    Hi - I have to process text files 10-20GB in size of the format: field1 field2 field3 field4 field5 I would like to parse the data from each line of field2 into one of several files; the file this gets pushed into is determined line-by-line by the value in field4. There are 25 different possible values in field2 and hence 25 different files the data can get parsed into. I have tried using Perl (slow) and awk (faster but still slow) - does anyone have any suggestions or pointers toward alternative approaches? FYI here is the awk code I was trying to use; note I had to revert to going through the large file 25 times because I wasn't able to keep 25 files open at once in awk: chromosomes=(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25) for chr in ${chromosomes[@]} do awk < my_in_file_here -v pat="$chr" '{if ($4 == pat) for (i = $2; i <= $2+52; i++) print i}' >> my_out_file_"$chr".query done

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  • Batch deletion of smaller files from group of files via unix command line

    - by artlung
    I have a large number (more than 400) of directories full of photos. What I want to do is to keep the larger sizes of these photos. Each directory has 31 to 66 files in it. Each directory has thumbnails, and larger versions, plus a file called example.jpg I dispatched the example.jpg file easily with: rm */example.jpg I initially thought that it would be easy to delete the thumbnails, but the problem is they are not consistently named. The typical pattern was photo1.jpg and photo1s.jpg. I did rm */photo*s.jpg but it ended up some of the files named photoXs.jpg were actually larger and not smaller. Argh. So what I want to do is scan each directory for filesize and delete (or move) the thumbnails. I initially thought I'd just ls -R every file and extract the size of each file and save those under a threshold. The problem? In one directory the large will be 1.1 MB and the thumb is 200k. In another the large is 200k and the small 30k. Even worse, the files really are mostly named photo1.jpg - so simply putting them all in the same folder, sorting by size, and deleting in groups would not work without renaming already, and if it's possible I'd prefer to keep them in their folders. I was almost resolved to just doing this all manually, but then thought I'd ask here. How would you do this task?

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  • I just recursively chmod'd everything under / to 750. Any tips?

    - by Ouairz
    I won't be the first and I won't be the last, I suppose. While playing around with the find command, I made a whoops and it would appear that instead of changing the permissions of the ~/web directory to 750, it changed the permissions of the entire filesystem (/) to 750, however I'm not certain, but any attempt to investigate is thwarted by Permission denied messages. For everything. This was the offending command: sudo find ~/web . type d -exec chmod 750 {} If I'm not mistaken, the Ubuntu team disabled root logins as a safety precaution so I'm out of ideas. I'm (obviously) a total newbie when it comes to file permissions so I was wondering if anyone had some good or even some bad advice to share. I've mentally prepped myself to losing everything on the computer which is only of mild consequence, since I have backups, but I did do a bit of work on this box over the week and it would be a shame to lose it all due to a boneheaded mistake. If you are reading this message, ask yourself, have you backed up any of your work recently? Thanks in advance for any insights. Feel free to scold me for using sudo carelessly

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  • How do I use Group Policy on a domain to delete Temporary Internet Files?

    - by Muhammad Ali
    I have a domain controller running on Windows 2008 Server R2 and users login to application servers on which Windows 2003 Server SP2 is installed. I have applied a Group Policy to clean temporary internet files on exit i.e to delete all temporary internet files when users close the browser. But the group policy doesn't seem to work as user profile size keeps on increasing and the major space is occupied by temporary internet files therefore increasing the disk usage. How can i enforce automatic deletion of temporary internet files?

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  • ld cannot find -limf -lsvml -lipgo -ldecimal -lirc

    - by Jaguaraci Silva
    I have installed the ICC recently, the XE composer 2013 version and I don't get success for running it because I have some errors to find libs that I don't know, however, I think that the artifact ia32-libs don't be found on the Ubuntu 12.04.1 can be the reason!. Thus, I got these dependencies: sudo apt-get install rpm build-essential sudo apt-get install libstdc++6 but these don't sudo apt-get install ia32-libs* or sudo apt-get install ia32-libs-multiarch I got this error always I'm trying compile on ICC: ld: cannot find -limf ld: cannot find -lsvml ld: cannot find -lipgo ld: cannot find -ldecimal ld: cannot find -lirc ld: cannot find -lsvml Thanks in advantage.

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  • using a "temporary files" folder in python

    - by zubin71
    I recently wrote a script which queries PyPI and downloads a package; however, the package gets downloaded to a user defined folder. I`d like to modify the script in such a way that my downloaded files go into a temporary folder, if the folder is not specified. The temporary-files folder in *nix machines is "/tmp" ; would there be any Python method I could use to find out the temporary-files folder in a particular machine? If not, could someone suggest an alternative to this problem?

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  • What is the fastest way to create a checksum for large files in C#

    - by crono
    Hi, I have to sync large files across some machines. The files can be up to 6GB in size. The sync will be done manually every few weeks. I cant take the filename into consideration because they can change anytime. My plan is to create checksums on the destination PC and on the source PC and than copy all files with a checksum, which are not already in the destination, to the destination. My first attempt was something like this: using System.IO; using System.Security.Cryptography; private static string GetChecksum(string file) { using (FileStream stream = File.OpenRead(file)) { SHA256Managed sha = new SHA256Managed(); byte[] checksum = sha.ComputeHash(stream); return BitConverter.ToString(checksum).Replace("-", String.Empty); } } The Problem was the runtime: - with SHA256 with a 1,6 GB File - 20 minutes - with MD5 with a 1,6 GB File - 6.15 minutes Is there a better - faster - way to get the checksum (maybe with a better hash function)?

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  • GNU make copy files to distro directory

    - by TheRoadrunner
    I keep my source html (and images etc.) in separate directories for source control. Part of making the distro is to have make copy files to output folder and set the attributes. Today my makefile shows (extract): %.html: /usr/bin/install -c -p -m 644 $< $@ www: $(HTMLDST)/firmware.html $(HTMLDST)/firmware_status.html $(HTMLDST)/index.html $(HTMLDST)/firmware.html: $(HTMLSRC)/firmware.html $(HTMLDST)/firmware_status.html: $(HTMLSRC)/firmware_status.html $(HTMLDST)/index.html: $(HTMLSRC)/index.html This is shown with only three html files, but in reality, there are lots. I would like to just list the filenames (without paths) and have make do the comparison between source and destination and copy the files that have been updated. Thank you in advance Søren

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  • Trying to cat files - unrecognized wildcard

    - by Barb
    Hello, I am trying to create a file that contains all of the code of an app. I have created a file called catlist.txt so that the files are added in the order I need them. A snippet of my catlist.txt: app/controllers/application_controller.rb app/views/layouts/* app/models/account.rb app/controllers/accounts_controller.rb app/views/accounts/* When I run the command the files that are explicitly listed get added but the wildcard files do not. cat catlist.txt|xargs cat > fullcode I get cat: app/views/layouts/*: No such file or directory cat: app/views/accounts/*: No such file or directory Can someone help me with this. If there is an easier method I am open to all suggestions. Barb

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  • cannot edit any php files using specific functions

    - by user458474
    I cannot update any txt files using php. When I write a simple code like the following: <?php // create file pointer $fp = fopen("C:/Users/jj/bob.txt", 'w') or die('Could not open file, or fike does not exist and failed to create.'); $mytext = '<b>hi. This is my test</b>'; // write text to file fwrite($fp, $mytext) or die('Could not write to file.'); $content = file("C:/Users/jj/bob.txt"); // close file fclose($fp); ?> Both files do exist in the folder. I just cannot see any updates on bob.txt. Is this a permission error in windows? It works fine on my laptop at home. I also cannot change the php files on my website, using filezilla.

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  • VSS - Solution file between multiple users

    - by BhejaFry
    Hi folks, we have a solution with multiple projects that is being developed by a team of developers. Project paths in the solution file checked in initially contains the path that are specific to that developer. Now when another dev gets latest of the solution, some of the projects won't load as the path differs. What's a better way to manage this ? TIA

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  • How to resize a /home partition in Kubuntu?

    - by Devon
    I was distro hopping for awhile in the past few months, so in order to keep all of my files secure, I made a partition of around 50 GB named Files to store all of my files in, and still have them for quick and easy access. However, now that I've found a distribution I'm comfortable with (Kubuntu 11.10), I would like to remove this partition, and have all of my files in my /home folder, in order to more easily deal with these files. I've moved all of my files in the partition to my /home folder (and still have plenty of room to spare), and now I'm trying to delete the partition and use the space for my /home folder. I can delete the partition just fine, however, I can't extend the /home folder into the unallocated space. Here's a screenshot of what I'm talking about. In order to change the size of the /home partition, I need to unmount it. But, I am unable to unmount it! How do I best extend the size of the partition?

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  • caching static files for ruby on rails application using nginx

    - by splintercell
    I have been trying for some time to serve & cache static files for my rails app using nginx. the rails app server runs mongrel_cluster and is deployed on a different host than that of nginx. following many of the available discussions I tried the following server { listen 80; server_name www.myappserver.com; ssl on; root /var/apps/myapp/current/public; location ~ ^/(images|javascripts|stylesheets)/ { root /var/apps/myapp/current; expires 10y; } location / { proxy_pass http://myapp_upstream; } } But nginx fails to find the images and to load the css and js files. Can anyone help me out here? My aim is to configure nginx in such a way that it caches the static files till expiry. Please suggest me some way to achieve this or am I missing any point here?

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  • socket.accept error 24: To many open files

    - by Creotiv
    I have a problem with open files under my Ubuntu 9.10 when running server in Python2.6 And main problem is that, that i don't know why it so.. I have set ulimit -n = 999999 net.core.somaxconn = 999999 fs.file-max = 999999 and lsof gives me about 12000 open files when server is running. And also i'm using epoll. But after some time it's start giving exeption: File "/usr/lib/python2.6/socket.py", line 195, in accept error: [Errno 24] Too many open files And i don't know how it can reach file limit when it isn't reached. Thanks for help)

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  • gem install cannot find a header file

    - by Milktrader
    Following along the github README for talib_ruby: sudo port install ta-lib Complete. Next is where the trouble begins. sudo env ARCHFLAGS="-arch PLATFORM" gem install talib_ruby -- --with-talib-include=ABSOLUTE_PATH_TO_TALIB_HEADERS --with-talib-lib=ABSOLUTE_PATH_TO_TALIB_LIBS This install fails I believe because apparently it cannot find the ta_abstract.h file talib.c:2:25: error: ta_abstract.h: No such file or directory . . . many more errors I have included in my .bash_profile file the following: export ABSOLUTE_PATH_TO_TALIB_HEADERS=/opt/local/var/macports/software/ta-lib/0.4.0_0/opt/local/include/ta-lib export ABSOLUTE_PATH_TO_TALIB_LIBS=/opt/local/var/macports/software/ta-lib/0.4.0_0/opt/local/lib And indeed the ta_abstract.h file is located where I'm saying in the ABSOLUTE_PATH variable assignment. What gives?

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  • How to create file of files?

    - by TheMachineCharmer
    class Node { FooType Data; // I can save Data to file with extension .foo void Save() { // save Data to .foo file } } Now , class Graph { List<Node> Nodes; void Save() { foreach(Node node in Nodes) { node.Save(); } } } Now when I invoke someGraph.Save(); then it creates Nodes.Count number of files. I would like to appear those files as one file with extension somename.graph and be able to read it again as Nodes. How can I do this? Is there a way to bundle files into a single different file?

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  • Reason for monolithic data files

    - by Ali Lown
    Primarily this seems to be a technique used by games, where they have all the sounds in one file, textures in another etc. With these files commonly reaching the GB size. What is the reason behind doing this over maintaining it all in subdirectories as small files - one per texture which many small games use this, with the monolithic system being favoured by larger companies? Is there some file system overhead with lots of small files? Are they trying to protect their property - although most just seem to be a compressed file with a new extension?

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  • Can I share files via SAMBA while in root?

    - by user212501
    I have a couple of things going on here. I am currently running UBUNTU 10.04 in root via "STARTX" command. The reason being is that I keep getting the "LOW GRAPHICS ERROR CODE" and I cant not start up normally. Now I have researched & researched the error. I mean I got my SUDO on........, o.k. I'm really done trying to fix this error. I just wanna re-install. (funny thing. This startx command is how Im using the laptop now, so I know that it is a software issue) So here's my dilemma that is inside another dilemma. I have about 30gigs of info that I need to get off the laptop before I can re-install. Any thoughts What say you? LOTR LOL

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  • How do I get mlocate to only index certain directories?

    - by Andrew Ferrier
    I'd like to use mlocate on my Ubuntu server, but only to index certain directories (e.g. /home and /data, but not everything under /). However, mlocate's standard configuration works the opposite way; you specify the paths you want to remove (with PRUNE_PATHS). Is there any easy way to achieve this, or any similar utility that will do what I want? (note: it should maintain an index like mlocate, so find is not acceptable, for example) Thanks.

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  • On a Mac, how can I find all files on a NTFS partition that have the same name, given case *in*sensi

    - by SCdF
    Here's the deal, I have a huge mess of files on an external drive that is formatted as NTFS. I wish to copy all of these files onto my MacBook Pro. NTFS, like sane filesystems, is case sensitive. HFS is not. There is, somewhere in the mess of tens of thousands of files and directories, one or more 'duplicates' in the eyes of HFS. Theses are preventing me from copying the entire directory of data onto my mac. (MacOSX rather unhelpfully throws a general error explaining the problem, but not the exact file. It also doesn't give you an option to skip) What is the best approach to solve this? Does anyone know a tool that can find files and directories that have the same case-insensitive name?

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  • Monitor flashes black when starting video files, opening folders with video files

    - by Bob
    My entire monitor flashes black for a second or so when starting any video file. It does the same thing when closing the file. It also does this when opening a folder that has video files and a thumbnail view, or when I do anything that presumably accesses the video stream inside a video file. It happens in VLC and Windows Media Player, though it occurs to me certain video editors I have like avidemux and virtualdub don't have that issue when opening video files... It also does not happen when watching flash-based videos on web sites. It doesn't seem to happen when Quicktime. I went through and uninstalled any extraneous programs a week or so ago and didn't see any change. I also updated the graphics card driver. What can I do to troubleshoot/fix this?

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  • Recovering files that do not appear in the Recycle Bin, but are in the $Recycle.bin folder on external drive

    - by Zach Morgan
    Problem: I have an NTFS external drive with a $Recycle.bin folder on the root (E:/$Recycle.bin/) that has about 70gb worth of data. For whatever reason, the folder is no longer a hidden system file and no Windows machine I have used the drive on will show the files in the actual Recycle Bin. What I Want To Do: I want to atleast view the recycle bin files from this external, and all of the help articles I have read just talk about deleting the folder all together. I plan on reformating the drive, but first I need to see if there are any important deleted files. What Didn't Work: Recuva - didn't see any of my files Resetting the external's Recycle Bin via command prompt and moving the old $Recycle.bin files into the new external $Recycle.bin folder (I didn't read this anywhere, just made it up on my own)

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