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  • Unix Piping using Fork and Dup

    - by Jacob
    Lets say within my program I want to execute two child processes, one to to execute a "ls -al" command and then pipe that into "wc" command and display the output on the terminal. How can I do this using pipe file descriptors so far the code I have written: An example would be greatly helpful int main(int argc, char *argv[]) { int pipefd[2]

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  • Identifying and removing null characters in UNIX

    - by fahdshariff
    I have a text file containing unwanted null characters. When I try to view it in I see ^@ symbols, interleaved in normal text. How can I: a) Identify which lines in the file contains null characters? I have tried grepping for \0 and \x0, but this did not work. b) Remove the null characters? Running strings on the file cleaned it up, but

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  • Ubuntu Equivalent of Unix Command cp -n

    - by Ted Karmel
    A software I need to install on my Ubuntu Hardy has a MAKE file which includes the command cp -n. However, I get an error stating the -n is an invalid option. The command will work on a Mac terminal but I need it to work on Ubuntu. Does anyone know the equivalent command for Ubuntu? Thanks.

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  • shell script passing arguments

    - by arav
    From the wrapper shell scripts i am calling the Java program. I want the Unix shell script to pass all the arguments to java program except the EMAIL argument. HOW Can i remove the EMAIL argument and pass the rest of the arguments to the java program. EMAIL argument can come at any position. valArgs() { until [ $# -eq 0 ]; do

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  • shell script passing subset of arguments

    - by arav
    From the wrapper shell scripts i am calling the Java program. I want the Unix shell script to pass all the arguments to java program except the EMAIL argument. HOW Can i remove the EMAIL argument and pass the rest of the arguments to the java program. EMAIL argument can come at any position. valArgs() { until [ $# -eq 0 ]; do

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  • Cleaning hanging IPCS in UNIX

    - by Sachin Chourasiya
    I knew that IPCRM is used to clean hanging IPCS and semaphores for a particumar user by passing the segment id or the semaphore id in either -m or -s option. WE NEED TO PASS INDIVIDUAL SEGMENT ID/ SEMAPHORE ID IN -m OPTION. Is there any way to clean ipcs that belongs to a particular user in just one move. I think shell script could be

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  • Passing multiple arguments to a UNIX shell script

    - by Waffles
    I have the following (bash) shell script, that I would ideally use to kill multiple processes by name. #!/bin/bash kill `ps -A | grep $* | awk '{ print $1 }'` However, while this script works is one argument is passed: end chrome (the name of the script is end) it does not work if more than one argument is passed: $end

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  • special character in UNIX

    - by Happy Mittal
    I want to add backspace character literally in my file named junk. So I did following $ ed a my name is happy\b (here b means I typed backspace so \ gets disapperaed and cursor sits sfter y) . w junk q But when I do $ od -cb junk it doesn't show backspace.

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  • Unix tree convert to recursive php array

    - by Fordnox
    I have a response from remote server like this: /home/computer/Downloads |-- /home/computer/Downloads/Apple | `-- /home/computer/Downloads/Apple/Pad |-- /home/computer/Downloads/Empty_Folder `-- /home/computer/Downloads/Subfolder |-- /home/computer/Downloads/Subfolder/Empty `--

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  • running a program in Unix vs in Windows

    - by Hristo
    I'm compiling a simple program written in C and I'm using Eclipse as an IDE, both in Windows 7 and on my MacBook Pro. Very simple program my friend wrote and asked me to help him with: int a = 0; char b[2]; printf("Input first class info:\n"); printf("Credit Hours: \n"); scanf("%d",

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  • Unix Interview Question [closed]

    - by Rachel
    I am giving some interviews right now and recently I was asked this questions in Interview and I was not sure of the answer, in your opinion are this kind of questions worthwhile for Interview process and if yes than how would you go about approaching this kind of questions. How

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  • strange behaviour of grep in UNIX

    - by Happy Mittal
    When I type a command $ grep \\h junk then shell should interpret \\h as \h as two pairs of \ become \ each, and grep in turn, should interpret \h as \h as \ becomes \, so grep should search for a pattern \h in junk, which it is doing successfully. But it's not working for \\$.

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  • Auto-Completion in Unix VI editor

    - by IllustratedInsomnia
    Hey guys, after using graphical IDE's like Visual Studio, I'm used to pressing CTRL+Space to auto-complete a variable or function name. Now, I know such a thing isn't completely possible in VI, but I heard there was a list of commands that could be mapped that allowed automatic

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  • problems with cut (unix)

    - by lego69
    hello everybody, I've got strange problem with cut I wrote script, there I have row: ... | cut -d" " -f3,4 >! out cut recieves this data (I checked it with echo) James James 033333333 0 0.00 but I recieve empty lines in out,

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  • php,unix command ,imagick not working

    - by user345804
    Hi, i am trying to bend text using imagemagik in PHP. but the commands shown in the website are not working. http://www.fmwconcepts.com/imagemagick/texteffect/index.php how can i run these scripts in PHP ? somebody please help me.. NB :-t \'SOME ARCHBOTTOM TEXT\' -s

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  • Reading into directory, unix shell script

    - by dubya
    I am trying to analyze the files/directories inside of a directory using a shell script, for example if the file is readable, if it is a file, if it is a directory, etc. My script is set up to take a directory as input. so I would type 'file.sh directoryname'. However,

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  • UNIX pipes on C block on read

    - by Toni Cárdenas
    I'm struggling to implement a shell with pipelines for class. typedef struct { char** cmd; int in[2]; int out[2]; } cmdio; cmdio cmds[MAX_PIPE + 1]; Commands in the pipeline are read and stored in cmds. cmdio[i].in is the pair of file descriptors of

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  • Combining echo and cat on Unix

    - by Dan
    Really simple question, how do I combine echo and cat in the shell, I'm trying to write the contents of a file into another file with a prepended string? If /tmp/file looks like this: this is a test I want to run this: echo "PREPENDED STRING" cat /tmp/file |

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