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  • How to create a CPU spike with a bash command

    - by User1
    I want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.

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  • Good book for learning Bash shell?

    - by John Isaacks
    I want to learn how to write shell scripts. Particularly I want to write a svn post-commit script to upload files from a test server to a production server. I am sure I will want to write more as I get more into it. I have very little linux/unix knowledge. Can anyone recommend a good book?

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  • LD_DEBUG and java

    - by solotim
    When I set LD_DEBUG=files and run my Java program, I found many errors like this: /linux/depot/java-1.6.0_16_32/jre/lib/i386/libjava.so: error: symbol lookup error: undefined symbol: Java_sun_java2d_loops_MaskBlit_MaskBlit (fatal) This info is horrifying, but obviously my program runs OK. Can anyone tell me why this happens?

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  • how to see contents of a.out file?

    - by abhilashm86
    The executable file of c++ will contain linkers, modules and others, i would like to look into its contents, i'm using linux, how can i view contents of a.out? which command should use to browse a.out, text editors wont show the contents......

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  • Daemonize() issues on Debian

    - by djTeller
    Hi, I'm currently writing a multi-process client and a multi-treaded server for some project i have. The server is a Daemon. In order to accomplish that, i'm using the following daemonize() code: static void daemonize(void) { pid_t pid, sid; /* already a daemon */ if ( getppid() == 1 ) return; /* Fork off the parent process */ pid = fork(); if (pid < 0) { exit(EXIT_FAILURE); } /* If we got a good PID, then we can exit the parent process. */ if (pid > 0) { exit(EXIT_SUCCESS); } /* At this point we are executing as the child process */ /* Change the file mode mask */ umask(0); /* Create a new SID for the child process */ sid = setsid(); if (sid < 0) { exit(EXIT_FAILURE); } /* Change the current working directory. This prevents the current directory from being locked; hence not being able to remove it. */ if ((chdir("/")) < 0) { exit(EXIT_FAILURE); } /* Redirect standard files to /dev/null */ freopen( "/dev/null", "r", stdin); freopen( "/dev/null", "w", stdout); freopen( "/dev/null", "w", stderr); } int main( int argc, char *argv[] ) { daemonize(); /* Now we are a daemon -- do the work for which we were paid */ return 0; } I have a strange side effect when testing the server on Debian (Ubuntu). The accept() function always fail to accept connections, the pid returned is -1 I have no idea what causing this, since in RedHat & CentOS it works well. When i remove the call to daemonize(), everything works well on Debian, when i add it back, same accept() error reproduce. I've been monitring the /proc//fd, everything looks good. Something in the daemonize() and the Debian release just doesn't seem to work. (Debian GNU/Linux 5.0, Linux 2.6.26-2-286 #1 SMP) Any idea what causing this? Thank you

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  • Where can I find the IRQ number in request_irq function?

    - by sasayins
    Hi, Im learning device driver programming in Linux. And I'm wondering where I could the IRQ number in the request_irq function. int request_irq (unsigned int irq, void (*handler) (int, void *, struct pt_regs *), unsigned long irqflags, const char *devname, void *dev_id); In the irq parameter, what value or where could I find that value to put in the request_irq function? Thanks

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  • Using grep to find all emails

    - by AntonAL
    Hi, How to properly construct regular expression for "grep" linux program, to find all email in, say /etc directory ? Currently, my script is following: grep -srhw "[[:alnum:]]*@[[:alnum:]]*" /etc It working OK - a see some of the emails, but when i modify it, to catch the one-or-more charactes before- and after the "@" sign ... grep -srhw "[[:alnum:]]+@[[:alnum:]]+" /etc .. it stops working at all Also, it does't catches emails of form "[email protected]" Help !

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  • How to display the output of command which run in machine Y.and program is written in machine X?

    - by Rahul
    *I have two Linux Machine,1st is machine X ,other is machine Y i want to write a java program which will run in machine X..eq test.java ..and when i run that java program it should ask for login credential of machine Y and will execute some command for example ls -l in machine Y automatically after login. and it should display the output of ls -l in machine X. How to do it please help me????*

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  • LDAP c++ API choice

    - by ypnos
    I would like to write my own LDAP client under Linux, specific to our local environment. Most probably I will use QT4 to provide a shiny frontend without much hassle. I found that there seems to be no standard C++ library for this. OpenLDAP provides a C API and there should also be a C++ API (experimental?) somewhere.. Do I need to use the C stuff or is there a C++ API out there worth of recommendation?

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  • compiling java program

    - by Hulk
    If the java program is compiled as javac t1.java a //error contents redirecedt to a,file a.But a doesnt have the error contents The contents of t1.java is as: class t1{ public static void main(String[] args) { System.out.printn("Hello World!"); // Display the string. } } So now there is a error i.e, println is written as print n ,how to capture this error in file a The command is executed from linux command prompt Thanks....

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  • Maximum number of inodes in a directory?

    - by Dr. UNIX
    Is there a maximum number of inodes in a single directory? I have a directory of 2 million+ files and can't get an the ls command to work against that directory. So now I'm wondering if I've exceeded a limit on inodes in Linux. Is there a limit before a 2^64 numerical limit?

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  • How to find the real user home directory using python?

    - by nsharish
    I see that if we change the HOME(linux) or USERPROFILE(windows) environmental variable and run a python script, it returns the new value as the user home when I tried, os.environ['HOME'] os.exp Is there any way to find the real user home directory without relying on the environmental variable?. Thanx.

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