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  • C signal parent process from child

    - by Gary
    I'm trying to solve a problem I've got where a child process runs execvp() and needs to let the parent know if it returns. So, after the execvp() returns (because there's been an error), how can I tell the parent that this particular event has happened so it can handle it. There's one method of writing a string of text through the pipe I'm using and then reading that from the parent.. but it seems a bit sloppy. Is there a better way? Thanks!

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  • How to make SVN ignore a folder?

    - by pg
    I want to make SVN ignore everything that is in my wordpress directory. It bring me nothing but headaches because of auto updates to plugins etc. When I... svn propedit svn:ignore ./blog It tells me... svn: None of the environment variables SVN_EDITOR, VISUAL or EDITOR is set, and no 'editor-cmd' run-time configuration option was found So I... [phil@sessions www]$ export SVN_EDITOR=emacs [phil@sessions www]$ svn propedit svn:ignore ./blog But I don't know what to put in here to make it ignore.

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  • Howto Plot "Reverse" Cumulative Frequency Graph With ECDF

    - by neversaint
    I have no problem plotting the following cumulative frequency graph plot like this. library(Hmisc) pre.test <- rnorm(100,50,10) post.test <- rnorm(100,55,10) x <- c(pre.test, post.test) g <- c(rep('Pre',length(pre.test)),rep('Post',length(post.test))) Ecdf(x, group=g, what="f", xlab='Test Results', label.curves=list(keys=1:2)) But I want to show the graph in forms of the "reverse" cumulative frequency of values x ? (i.e. something equivalent to what="1-f"). Is there a way to do it? Other suggestions in R other than using Hmisc are also very much welcomed.

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  • Which OS the binary was build

    - by Prakash
    We have recently installed RHEL 5.4 on some existing 6.2 OS and migrated our code from RH 6.2 to RHEL 5.4. We are facing a difficulty that given a binary (on both OS they have same name) how can we distinguish that which gcc and OS it was build as there are some minor differences in between binary respectively made. Please help

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  • How to print lines from a file that have repeated more than six times

    - by Mike
    I have a file containing the data shown below. The first comma-delimited field may be repeated any number of times, and I want to print only the lines after the sixth repetition of any value of this field For example, there are eight fields with 1111111 as the first field, and I want to print only the seventh and eighth of these records Input file: 1111111,aaaaaaaa,14 1111111,bbbbbbbb,14 1111111,cccccccc,14 1111111,dddddddd,14 1111111,eeeeeeee,14 1111111,ffffffff,14 1111111,gggggggg,14 1111111,hhhhhhhh,14 2222222,aaaaaaaa,14 2222222,bbbbbbbb,14 2222222,cccccccc,14 2222222,dddddddd,14 2222222,eeeeeeee,14 2222222,ffffffff,14 2222222,gggggggg,14 3333333,aaaaaaaa,14 3333333,bbbbbbbb,14 3333333,cccccccc,14 3333333,dddddddd,14 3333333,eeeeeeee,14 3333333,ffffffff,14 3333333,gggggggg,14 3333333,hhhhhhhh,14 Output: 1111111,gggggggg,14 1111111,hhhhhhhh,14 2222222,gggggggg,14 3333333,gggggggg,14 3333333,hhhhhhhh,14 What I have tried is to transponse the 2nd and 3rd fields with respect to 1st, so that I can use nawk on the field of $7 or $8 #!/usr/bin/ksh awk -F"," '{ a[$1]; b[$1]=b[$1]","$2 c[$1]=c[$1]","$3} END{ for(i in a){ print i","b[i]","c[i]} } ' file > output.txt

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  • image magick please help he

    - by Libi
    system(' convert -size 320x100 xc:lightblue -font Candice -pointsize 72 \ -fill navy -annotate +25+65 \'Anthony\' \ -distort Arc 120 -trim +repage \ -bordercolor lightblue -border 10 font_arc.jpg '); curving text like arc This code is not working please help me

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  • how can i get the file permission of a directory with java

    - by user571652
    i try to check the permission granted to a directory in linux, i mean i have a directory with permission 755 berty@berty-laptop:~$ ls -l / |grep directory drwxr-xr-x 3 root root 4096 2011-01-10 12:33 directory how can i read that permission with java? I've tried using FilePermission but though i have a directory with all the permissions (777) the FilePermission class always returns an exception java.security.AccessControlException: Access denied (java.io.FilePermission /home/directory read) at java.security.AccessController.checkPermission(AccessController.java:103) at com.snippets.Check4DirectoryPermission.checker(Check4DirectoryPermission.java:50) at com.snippets.Check4DirectoryPermission.main(Check4DirectoryPermission.java:70) is there another way to do this?

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  • reading a file that doesn't exist

    - by John
    Hi, I have got a small program that prints the contents of files using the system call - read. unsigned char buffer[8]; size_t offset=0; size_t bytes_read; int i; int fd = open(argv[1], O_RDONLY); do{ bytes_read = read(fd, buffer, sizeof(buffer)); printf("0x%06x : ", offset); for(i=0; i<bytes_read; ++i) { printf("%c ", buffer[i]); } printf("\n"); offset = offset + bytes_read; }while(bytes_read == sizeof(buffer)); Now while running I give a file name that doesn't exist. It prints some kind of data mixed with environment variables and a segmentation fault at the end. How is this possible? What is the program printing? Thanks, John

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  • Understanding EXE Internals

    - by Steve
    I was attempting to install an exe that requires a serial number before the install, which the vendor has not provided to us yet. This got my wheels turning about whether there is any information that can be gained from viewing an exe using a hex editor/VI/etc? Using VI to view an exe, I can see some sections of plain text, but it is difficult to determine what it refers to without any context around it. Is it possible to determine any information by reading an exe? Thanks

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  • Bash: Is it ok to use same input file as output of a piped command?

    - by Amro
    Consider something like: cat file | command > file Is this good practice? Could this overwrite the input file as the same time as we are reading it, or is it always read first in memory then piped to second command? Obviously I can use temp files as intermediary step, but I'm just wondering.. t=$(mktemp) cat file | command > ${t} && mv ${t} file

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  • What benefits can Java developer have moving to a *NIX platform?

    - by dave-keiture
    Hi everyone, A friend of mine is a Java developer, who's using *NIX for ages. He claims that *NIX is for real Java geeks, whereas WIN is for dummies (and I'm one of them, according to him) and girls. When I ask him to argue his position, and explain, what's so good for Java developer on *NIX, he starts talking about console, wget, curl and grep. But sorry, wget and curl analogues exist for the WIN platform as well. As for the console - I'm using FAR Commander, and have access to the command line when I need. Moreover, even if I decide moving to *NIX, I will certainly use Netbeans or Eclipse there, so there will be no big difference. Guys, who use Java on *NIX, could you please give me a real killer examples, when *NIX (any util or technique) dramatically increases Java development productivity (in the way the hints are given in "The Pragmatic Programmer"), or, which is also important, gives more fun from the process. Thanks in advance!

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  • Ubuntu makes noise and heat when AC charger is inserted

    - by user2263752
    I have an issue with heat and noise on my laptop with Ubuntu 14.04 installed. The thing is that when I have the AC charger plugged into the laptop, it automatically goes to "boost mode" or something. And when the laptop is on battery mode, the heat and noise is reduced shortly. I want the laptop to be on battery mode as general and "boost mode" as an option if more power is needed. Any solutions? I have installed tlp that doesn't seen to have any effect.

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  • How to (legitimately) access files after putting self into chrooted sandbox?

    - by unknown google user
    Changing a Linux C++ program which gives the user limited file access. Thus the program chroots itself to a sandbox with the files the user can get at. All worked well. Now, however, the program needs to access some files for its own needs (not the user's) but they are outside the sandbox. I know chroot allows access to files opened before the chroot but in this case the needed files could a few among many hundreds so it is obviously impractical to open them all just for the couple that might be required. Is there any way to get at the files?

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  • In a process using lots of memory, how can I spawn a shell without a memory-hungry fork()?

    - by kdt
    On an embedded platform (with no swap partition), I have an application whose main process occupies most of the available physical memory. The problem is that I want to launch an external shell script from my application, but using fork() requires that there be enough memory for 2x my original process before the child process (which will ultimately execl itself to something much smaller) can be created. So is there any way to invoke a shell script from a C program without incurring the memory overhead of a fork()? I've considered workarounds such as having a secondary smaller process which is responsible for creating shells, or having a "watcher" script which I signal by touching a file or somesuch, but I'd much rather have something simpler.

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  • Does deleting 'M'odified line in SVN Commit have an effect

    - by cdated
    When running the commandsvn ci you get a text editor that allows you to place a comment, below that is there is the text "--This line, and those below, will be ignored--", then the files modified, added, or deleted. If I were to delete a line such as: M folderA/fileA Would it remove that file from the check in, or is that just an SVN comment that has no other effect?

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  • image magick ,text arc

    - by manu
    system(' convert -size 320x100 xc:lightblue -font Courier -pointsize 72 \ -fill navy -annotate +25+65 \'Ernakulam1\' \ -virtual-pixel transparent -distort arc 120 \ -bordercolor lightblue font_arcnew.jpg'); This coe is not working Example arc the text mainly this code is not working -virtual-pixel transparent -distort arc 120

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  • How to get proper alignment when printing to file

    - by user1067334
    I have this Structure the elements of which that I need to write in a text file struct Stage3ADisplay { int nSlot; char *Item; char *Type; int nIndex; unsigned char attributesMD[17]; //the last character is \0 unsigned char contentsMD[17]; //only for regular files - //the last character is \0 }; buffer = malloc(sizeof(Stage3ADisplayVar[nIterator]->nSlot) + sizeof(Stage3ADisplayVar[nIterator]->Item) + sizeof(Stage3ADisplayVar[nIterator]->Type) + sizeof(Stage3ADisplayVar[nIterator]->nIndex) + sizeof(Stage3ADisplayVar[nIterator]->attributesMD) + sizeof(Stage3ADisplayVar[nIterator]->contentsMD) + 1); sprintf (buffer,"%d %s %s %d %x %x",Stage3ADisplayVar[nIterator]->nSlot, Stage3ADisplayVar[nIterator]->Item,Stage3ADisplayVar[nIterator]->Type,Stage3ADisplayVar[nIterator]->nIndex,Stage3ADisplayVar[nIterator]->attributesMD,Stage3ADisplayVar[nIterator]->contentsMD); How do I make sure the rows in the file are properly aligned. Thank you.

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  • echo value inside a variable ?

    - by Kimi
    x=102 y=x means when i echo $y it gives x echo $y x --and not 102 and when i echo $x it give 102 lets say I dnt know what is inside y and i want the value of x to be echoed with using y someting like this a=`echo $(echo $y)` echo $a Ans 102

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