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  • Where can you find fun/educational programming challenges?

    - by tj9991
    I've searched around for different challenge sites, and most of them seem to be geared towards difficulty in problem solving logically, rather than trying to use your language of choice to do something you haven't used it for. Their center is around mathematics rather than function design. Some kind of point system for correctly solving challenges, or solving them the most efficient/smallest would be neat as well. Listed sites Project Euler TopCoder UVa Online Judge Challenges with Python Google Code Jam Programming Challenges Less Than Dot ACM's Programing Contest archive USACO problems ITA Software's puzzle page Refactor My Code Ruby Quiz

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  • Start Codeblocks project from external code

    - by Dnaiel
    I have C++ code that depends on boost and other libraries, and therefore this code has a makefile that invokes boost. I am now trying to start developing this code in codeblocks in linux, so in order to do that I have two basic questions: (1) How can I import the code into codeblocks as a codeblocks new project? (2) How do I invoke the makefile with codeblocks instead of codeblocks trying to compile the code (which it would fail since codeblocks does not know that it needs to invoke boost). Sorry if it's too basic but I am quite new to C++ and codeblocks. Thanks!

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  • Bad File descriptor

    - by Luke
    Does anyone see a problem with this, its not working saying bad file descriptor not sure why? pipe(pipefd[0]); if ((opid = fork()) == 0) { dup2(pipefd[0][1],1);/*send to output*/ close(pipefd[0][0]); close(pipefd[0][1]); execlp("ls","ls","-al",NULL); } if((cpid = fork())==0){ dup2(pipefd[0][1],0);/*read from input*/ close(pipefd[0][0]); close(pipefd[1][1]); execlp("grep","grep",".bak",NULL); } close(pipefd[0][0]); close(pipefd[0][1]);

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  • Unzipping ".xz" file with 7z and lzma

    - by neversaint
    I tried to uncompressed a "*.xz" file with both 7z and lzma. But they gave me such message: $ 7z x J_12.fq.xz 7-Zip 4.57 Copyright (c) 1999-2007 Igor Pavlov 2007-12-06 p7zip Version 4.57 (locale=C,Utf16=off,HugeFiles=on,4 CPUs) Processing archive: J_12.fq.xz Error: Can not open file as archive $ 7z x J_12.fq.xz 7-Zip 4.57 Copyright (c) 1999-2007 Igor Pavlov 2007-12-06 p7zip Version 4.57 (locale=C,Utf16=off,HugeFiles=on,4 CPUs) Processing archive: J_12.fq.xz Error: Can not open file as archive and with lzma $ lzma -d J_12.fq.xz J_12.fq.xz: unknown suffix -- unchanged

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  • Can't get websrvmng to run in Plesk SSH terminal.

    - by JohnB
    I am following this MediaTemple KB article and stuck at the last step. When I try to run the websrvmng (using the ssh terminal in Plesk) using the code the KB references: /usr/local/psa/admin/sbin/websrvmng -v -a I receive a 'File or Directory not found' error. I am a n00b when it comes to this stuff and would really appreciate any advice/suggestions for how to get websrvmng to run. I have searched through tons of articles on it but found nothing more illuminating than the above code. I am sure I'm overlooking something simple (login as root to run? something I need to replace in the code like usr?). It is a MediaTemple DV server running CentOS 5 and as I said using Plesk. I desperately need to get this to work and I am pulling my hair out, so as I said any help would be greatly appreciated.

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  • Getting javadoc for Google Wave robot programming in Eclipse

    - by Espenhh
    Hey, Does anyone know how I can get the helpful Eclipse popups with javadoc when programming for the Google Wave Robots API? I have access to the JAR-file, the HTML Javadoc, as well as the source files from here How do I set up eclipse so I get javadoc integrated? I have tried adding the source files, but things just get "messy"

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  • prepend to a file one liner shell?

    - by elmarco
    This is probably a complex solution. I am looking for a simple operator like "", but for prepending. I am afraid it does not exist. I'll have to do something like mv $F tmp cat header tmp $F Anything smarter? (I am not fond of tmp files)

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  • sed/awk or other: one-liner to increment a number by 1 keeping spacing characters

    - by WizardOfOdds
    EDIT: I don't know in advance at which "column" my digits are going to be and I'd like to have a one-liner. Apparently sed doesn't do arithmetic, so maybe a one-liner solution based on awk? I've got a string: (notice the spacing) eh oh 37 and I want it to become: eh oh 36 (so I want to keep the spacing) Using awk I don't find how to do it, so far I have: echo "eh oh 37" | awk '$3>=0&&$3<=99 {$3--} {print}' But this gives: eh oh 36 (the spacing characters where lost, because the field separator is ' ') Is there a way to ask awk something like "print the output using the exact same field separators as the input had"? Then I tried yet something else, using awk's sub(..,..) method: ' sub(/[0-9][0-9]/, ...) {print}' but no cigar yet: I don't know how to reference the regexp and do arithmetic on it in the second argument (which I left with '...' for now). Then I tried with sed, but got stuck after this: echo "eh oh 37" | sed -e 's/\([0-9][0-9]\)/.../' Can I do arithmetic from sed using a reference to the matching digits and have the output not modify the number of spacing characters? Note that it's related to my question concerning Emacs and how to apply this to some (big) Emacs region (using a replace region with Emacs's shell-command-on-region) but it's not an identical question: this one is specifically about how to "keep spaces" when working with awk/sed/etc.

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  • write error: Broken pipe

    - by Fahim
    Hi, I have to run a tool on around 300 directories. Each run take around 1 minute to 30 minute or even more than that. So, I wrote a python script having a loop to run the tool on all directories one after another. my python script has code something like: for directory in directories: os.popen('runtool_exec ' + directory) But when I run the python script I get the following error messages repeatedly: .. tail: write error: Broken pipe date: write error: Broken pipe .. All I do is login on a remote server using ssh where the tool, python script, and subject directories are kept. When I individually run the tool from command prompt using command like: runtool_exec directory it works fine. "broken pipe" error is coming only when I run using the python script. Any idea, workaround? Please suggest. Thanks. Fahim

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  • Fish Interactive Shell full path

    - by Milhous
    Is there a way in the Fish Interactive shell for the full path to be displayed. Currently when I navigate to a directory I get the following shell. millermj@Dodore ~/o/workspace but I would rather see millermj@Dodore ~/o-town/workspace

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  • grep a specific word and sum it

    - by Kimi
    I want to grep an environment variable env | grep ABC_IJK[1,2] currenlty defined variables are like this ABC_IJK1=123 ABC_IJK1_XYZ=sn123:345 ABC_IJK2=999 ABC_IJK2_XYZ=sn321:999 I only want to get only this ABC_IJK1=123 ABC_IJK2=999 get number of connections sum them(not 123 + 999) and save in N1 (this one has 2 connection) so N1=2 get number of connections sum them and save in N2 for other machine (if this have four) so N2=4 If the value is not there or the variable is not present then N1=1 for below: ABC_IJK1= ABC_IJK2=123 Then need to compare it with a MAX_CONNECTION variable Thanks

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  • perl issuing os command with defined variables

    - by Vinnie Biros
    I am adding functionality into my scripts so that they can use kerberos authentication to run automatically and use secure protocols when executing. I have my functionality working for shell scripts that do exactly what i want, however i am having issues porting it to perl to work within my perl scripts as i am new to perl. Here is my working shell code and trying to get the same functionality in perl: #!/bin/sh ticketFileName=`basename $0-$$` #set filename variable to name of script plus the PID krb5CacheLocation=/tmp/$ticketFileName #set ticket cache location to /tmp + script name /usr/share/centrifydc/kerberos/bin/kinit -c $krb5CacheLocation -kt /root/.ssh/someaccount.keytab someaccount #get TGT and specifiy ticket cache location on kinit export KRB5CCNAME=$krb5CacheLocation #set the KRB5CCNAME variable to tell ssh where to look What i have attempted in perl: #!/usr/bin/perl my $ticketFileName = `basename $0-$$`; my $krb5CacheLocation = '/tmp/'.$ticketFileName; `export KRB5CCNAME=$krb5CacheLocation`; `/usr/share/centrifydc/kerberos/bin/kinit -c $krb5CacheLocation -kt /root/.ssh/unixmap0000.keytab unixmap0000`; Seems it is not liking the passed variable that i am referencing in the OS command. Anyone have any ideas or suggestions?

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  • Programming Logic upgrading from VB6 to Vb.net

    - by KoolKabin
    Hi guys, I have been programming in vb6 for few time ago and i used open SQL Server connection and command objects to make database traansactions. I have been searching for similar approaches in vb.net too but not finding any starting point. How can we work similarly in vb.net application?

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  • Creating multiple process and simulation in C via fork()

    - by Yakup OZDEN
    i want to create multiple process groups which will call different functions. i write the code below. firstly i want to get following output ./fork 4 5 I am a child: 1 PID: 22330 I am a child2: 1 PID: 22334 I am a child: 2 PID: 22331 I am a child2: 5 PID: 22338 I am a child: 4 PID: 22333 I am a child: 3 PID: 22332 I am a child2: 2 PID: 22335 I am a child2: 4 PID: 22337 I am a child2: 3 PID: 22336 ' #include <stdio.h> #include <stdlib.h> #include <unistd.h> void forkChildren (int nChildren) { int i; pid_t pid; for (i = 1; i <= nChildren; i++) { pid = fork(); if (pid == -1) { /* error handling here, if needed */ return; } if (pid == 0) { printf("I am a child: %d PID: %d\n",i, getpid()); sleep (5); wait(NULL); return; } } } void forkChildren2 (int nChildren) { int i; pid_t pid; for (i = 1; i <= nChildren; i++) { pid = fork(); if (pid == -1) { /* error handling here, if needed */ return; } if (pid == 0) { printf("I am a child2: %d PID: %d\n",i, getpid()); sleep (2); return; } } } the code gives me the output [ozdeny@hyperion ~]$ ./fork 4 5 I am a child: 1 PID: 22330 I am a child: 2 PID: 22331 I am a child: 3 PID: 22332 I am a child: 4 PID: 22333 I am a child2: 1 PID: 22334 I am a child2: 2 PID: 22335 I am a child2: 4 PID: 22337 I am a child2: 5 PID: 22338 [ozdeny@hyperion ~]$ I am a child2: 3 PID: 22336 I am a child2: 1 PID: 22339 I am a child2: 2 PID: 22340 I am a child2: 3 PID: 22341 I am a child2: 4 PID: 22342 I am a child2: 5 PID: 22343 I am a child2: 1 PID: 22345 I am a child2: 2 PID: 22346 I am a child2: 3 PID: 22347 I am a child2: 1 PID: 22349 I am a child2: 2 PID: 22350 I am a child2: 1 PID: 22344 I am a child2: 2 PID: 22352 I am a child2: 3 PID: 22353 I am a child2: 4 PID: 22354 I am a child2: 5 PID: 22355 I am a child2: 3 PID: 22351 I am a child2: 4 PID: 22356 I am a child2: 5 PID: 22357 I am a child2: 4 PID: 22348 I am a child2: 5 PID: 22358

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  • Convert Chunk of Data into Tabular Format Using Perl

    - by neversaint
    I have a data that looks like this 1:SRX000566 Submitter: WoldLab Study: RNASeq expression profiling for ENCODE project(SRP000228) Sample: Human cell line GM12878(SRS000567) Instrument: Solexa 1G Genome Analyzer Total: 4 runs, 62.7M spots, 2.1G bases Run #1: SRR002055, 11373440 spots, 375323520 bases Run #2: SRR002063, 22995209 spots, 758841897 bases Run #3: SRR005091, 13934766 spots, 459847278 bases Run #4: SRR005096, 14370900 spots, 474239700 bases 2:SRX000565 Submitter: WoldLab Study: RNASeq expression profiling for ENCODE project(SRP000228) Sample: Human cell line GM12878(SRS000567) Instrument: Solexa 1G Genome Analyzer Total: 3 runs, 51.2M spots, 1.7G bases Run #1: SRR002052, 12607931 spots, 416061723 bases Run #2: SRR002054, 12880281 spots, 425049273 bases Run #3: SRR002060, 25740337 spots, 849431121 bases 3:SRX012407 Submitter: GEO Study: GSE17153: Illumina sequencing of small RNAs from C. elegans embryos(SRP001363) Sample: Caenorhabditis elegans(SRS006961) Instrument: Illumina Genome Analyzer II Total: 1 run, 3M spots, 106.8M bases Run #1: SRR029428, 2965597 spots, 106761492 bases Is there a compact way to convert them into tabular format (tab separated). Hence 1 entry/row per chunk. In these case 3 rows. I tried this but doesn't seem to work. perl -laF/\n/ -000ne"print join chr(9),@F" myfile.txt

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  • Teach Perl as a first language?

    - by yossale
    I need to teach a non-programmer the basics of computer programming + some basic programming skills (- He's going to be in a position between the clients and the programmers , so the company requires him to learn the basic concepts of programming). I thought of Perl - You can teach it without getting into typing and pointers and it's syntax is very close to human (precious "bless" :) ) - but I'm a bit troubled because I feel like I'm going to "spoil" him for other languages in the future (C,C++,Java - What some people call "Real" languages) - exactly because of the reasons mentioned above. What do you think?

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  • expr non-numeric argument shell script

    - by Kimi
    The below check is not working : expr non-numeric argument shell script. Always it is going to else. Please tell me what is the mistake. Earlier I was no using while so the same thing was woring fine now suddenly when I did put it in the while loop it is no working. echo "`${BOLD}` ***** Checking Memory Utilization User*****`${UNBOLD}`" echo "===================================================" IFS='|' cat configMachineDetails.txt | grep -v "^#" | while read MachineType UserName MachineName do export MEMORY_USAGE1=`ssh -f -T ${UserName}@${MachineName} prstat -t -s rss 1 2 | tr '%' ' '| awk '$5>5.0'` export LEN=`echo "$MEMORY_USAGE1"|wc -l` export CNPROC=`echo "$MEMORY_USAGE1"|grep "NPROC"|wc -l` export CTotal=`echo "$MEMORY_USAGE1"|grep "Total"|wc -l` **if [ $LEN = `expr $CNPROC + $CTotal` ] then echo "`${BOLD}`**************All usages are normal !!!!!! *************`${UNBOLD}`" else echo "`${BOLD}`**** Memory(%) is more than 5% in MachineType $MachineType UserName $UserName MachineName $MachineName *******`${UNBOLD}`" echo "====================================================" echo "$MEMORY_USAGE1" fi** done

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  • FtpWebRequest Download File

    - by pm_2
    The following code is intended to retrieve a file via FTP. However, I'm getting an error with it. serverPath = "ftp://x.x.x.x/tmp/myfile.txt"; FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverPath); request.KeepAlive = true; request.UsePassive = true; request.UseBinary = true; request.Method = WebRequestMethods.Ftp.DownloadFile; request.Credentials = new NetworkCredential(username, password); // Read the file from the server & write to destination using (FtpWebResponse response = (FtpWebResponse)request.GetResponse()) // Error here using (Stream responseStream = response.GetResponseStream()) using (StreamReader reader = new StreamReader(responseStream)) using (StreamWriter destination = new StreamWriter(destinationFile)) { destination.Write(reader.ReadToEnd()); destination.Flush(); } The error is: The remote server returned an error: (550) File unavailable (e.g., file not found, no access) The file definately does exist on the remote machine and I am able to perform this ftp manually (i.e. I have permissions). Can anyone tell me why I might be getting this error?

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  • Signal Handling in C

    - by Dave
    How can I implement signal Handling for Ctrl-C and Ctrl-D in C....So If Ctrl-C is pressed then the program will ignore and try to get the input from the user again...If Ctrl-D is pressed then the program will terminate... My program follows: int main(){ char msg[400]; while(1){ printf("Enter: "); fgets(msg,400,stdin); printf("%s\n",msg); } } Thanks, Dave

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  • What is a real world example of bad code or programming practice

    - by Luke101
    I just want to know some bad programming practice or code I should avoid to make sure it does not exist in my code. I use c# asp.net but the example you give can be in any language since the idea is still the same. I have follow many suggestions on SO that really cleaned my code up. Now I looking to launch my application and want to make sure its ready for prime time.

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  • Applications for the Church Programming Language

    - by Chris S
    Has anyone worked with the programming language Church? Can anyone recommend practical applications? I just discovered it, and while it sounds like it addresses some long-standing problems in AI and machine-learning, I'm sceptical. I had never heard of it, and was surprised to find it's actually been around for a few years, having been announced in the paper Church: a language for generative models.

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  • Options for Linux OS executable archive files - self installers

    - by Matt1776
    I am looking to create a web-project that is able to install with a program. The user should be able to download an archive file or tar file, run it (executable), and the setup script would ask for paths and configurable values and then unpack its 'payload' and sorting out the contents for deployment. This would be a Linux version of the MSI installer. Is there such a thing for Linux operating systems? This does not involve kernel level manipulations. All it needs to do is copy directories and files on the filesystem, which should cover about 80% if not more of all the *nix distributions.

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