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  • Unix System Call in Objective-C

    - by Biranchi
    Hi all, Is it possible to make system call in Objective-C? I have the following code: if (!system("ls -l")) { NSLog(@"Successfully executed"); } else { NSLog(@"Error while executing the command"); } How to get the output? Thanks

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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 I'm just wondering if this is the best way? Thanks

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  • How can UNIX access control create compromise problems ?

    - by Berkay
    My system administrators advice me to be careful when setting access control to files and directories. He gave me an example and i got confused, here it is: a file with protection mode 644 (octal) contained in a directory with protection mode 730. so it means: File:101 100 100 (owner, group,other: r-x r-- r--) Directory:111 011 000 (owner, group,other: rwx -wx ---) How can file be compromised in this case ?

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  • Unix RPC programming

    - by Abhi
    Heyy all, I needed some help with ONC RPC programming. My task is to create two-tier client-server architecture wherein one main server (something like a directory) keeps a track of level-two servers and acts as a lookup; the level-two servers exposing some trivial functions, and finally, the clients for level-two servers. The clients ask the directory where a server is located, and then communicate with it. Using RPCGEN, we can create a pair of client-server code; however, the clients in this case need to have stubs for the directory as well as the level-two functions. Being a newbie to RPC, I'm having trouble conceptualizing the way I should code this. How can I call a function from a different server if a client is generated using a different IDL ? Any pointers would be appreciated :) Regards, Abhi

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  • Regarding Unix shell script

    - by arav
    I want to retrieve the file from the INFILE directory which are begining with the file names prefix "BBSCGG_" or "BCT_" or "ACL_" or "ASC" and do the processing inside the for loop INFILE=/ext/test/fil1/ for infile name in file prefix ... if [[ -f ${fspec} ]] ; then processing logic else processing logic done how can i do it

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  • Creating a child process on Unix systems?

    - by Hakan Svensson
    I'm trying to create a child process in another process. I am writing both the programs in C language. First I write a dummy process which will be the child process. What it is doing is only to write a string on the screen. It works well on its own. Then I write another program which will be the parent process. However, I can't make it happen. I'm trying to use fork and execl functions together, but I fail. I also want the child process does not terminate until the parent process terminates. How should I write the parent process? Thanks.

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  • Unix makefile errors " 'ake: Fatal error: Don't know how to make (c file here)"

    - by gwenger
    I've written the below makefile: hw2p1: hw2p1_main.o hw2p1_getit.o hw2p1_parseit.o hw2p1_moveit.o hw2p1_showit.o gcc hw2p1_main.o hw2p1_getit.o hw2p1_parseit.o hw2p1_moveit.o hw2p1_showit.o hw2p1_main.o: hw2p1_main.c gcc -c hw2p1_main.c hw2p1_getit.o: hw2p1_getit.c gcc -c hw2p1_getit.c hw2p1_parseit.o: hw2p1_parseit.c gcc -c hw2p1_parseit.c hw2p1_moveit.o: hw2p1_moveit.c gcc -c hw2p1_moveit.c hw2p1_showit.o: hw2p1_showit.c gcc -c hw2p1_showit.c The first time I tried to call make, I got the error: "make: Fatal error: unexpected end of line seen" I deleted the blank lines between targets and called make again, but this time I got " 'ake: Fatal error: Don't know how to make hw2p1_main.c" I've compiled all of these files separately and then linked them so I know that the errors are a result of an incorrect makefile and not a result of errors in my c files. This is the first makefile that I've ever written so I might just be doing it completely incorrectly. Either way, any suggestions on how to get rid of these errors?

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  • Hard link and Symbolic links in Unix

    - by darkie15
    Hi All, I just wanted to clarify if a hard/symbolic link is actually a file that is created ?? I ran the command: ln source hardlink ln -s source softlink -- The ls command shows this 2 links as a file. So my query is, does ln / ln -s actually create a file? Regards, Shyam

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  • Unix: How to use Bash backticks recursively

    - by HH
    Either I missed some backlash or backlashing does not seem to work with too much programmer-quote-looping. $ echo "hello1-`echo hello2-\`echo hello3-\`echo hello4\`\``" hello1-hello2-hello3-echo hello4 Wanted hello1-hello2-hello3-hello4-hello5-hello6-...

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  • [UNIX] Sort lines of massive file by number of words on line (ideally in parallel)

    - by conradlee
    I am working on a community detection algorithm for analyzing social network data from Facebook. The first task, detecting all cliques in the graph, can be done efficiently in parallel, and leaves me with an output like this: 17118 17136 17392 17064 17093 17376 17118 17136 17356 17318 12345 17118 17136 17356 17283 17007 17059 17116 Each of these lines represents a unique clique (a collection of node ids), and I want to sort these lines in descending order by the number of ids per line. In the case of the example above, here's what the output should look like: 17118 17136 17356 17318 12345 17118 17136 17356 17283 17118 17136 17392 17064 17093 17376 17007 17059 17116 (Ties---i.e., lines with the same number of ids---can be sorted arbitrarily.) What is the most efficient way of sorting these lines. Keep the following points in mind: The file I want to sort could be larger than the physical memory of the machine Most of the machines that I'm running this on have several processors, so a parallel solution would be ideal An ideal solution would just be a shell script (probably using sort), but I'm open to simple solutions in python or perl (or any language, as long as it makes the task simple) This task is in some sense very easy---I'm not just looking for any old solution, but rather for a simple and above all efficient solution

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  • for ps aux what are Ss Sl Ssl proccess types UNIX

    - by JiminyCricket
    when doing a "ps aux" command I get some process listed as Ss, Ssl and Sl what do these mean? root 24653 0.0 0.0 2256 8 ? Ss Apr12 0:00 /bin/bash -c /usr/bin/python /var/python/report_watchman.py root 24654 0.0 0.0 74412 88 ? Sl Apr12 0:01 /usr/bin/python /var/python/report_watchman.py root 21976 0.0 0.0 2256 8 ? Ss Apr14 0:00 /bin/bash -c /usr/bin/python /var/python/report_watchman.py root 21977 0.0 0.0 73628 88 ? Sl Apr14 0:01 /usr/bin/python /var/python/report_watchman.py

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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] pipe(pipefd2); if ((fork()) == 0) { dup2(pipefd2[1],STDOUT_FILENO); close(pipefd2[0]); close(pipefd2[1]); execl("ls", "ls","-al", NULL); exit(EXIT_FAILURE); } if ((fork()) == 0){ dup2(pipefd2[0],STDIN_FILENO); close(pipefd2[0]); close(pipefd2[1]); execl("/usr/bin/wc","wc",NULL); exit(EXIT_FAILURE); } close(pipefd[0]); close(pipefd[1]); close(pipefd2[0]); close(pipefd2[1]); }

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  • Bash: using commands as parameters (specificly cd, dirname and find)

    - by sixtyfootersdude
    This command and output: % find . -name file.xml 2> /dev/null ./a/d/file.xml % So this command and output: % dirname `find . -name file.xml 2> /dev/null` ./a/d % So you would expect that this command: % cd `dirname `find . -name file.xml 2> /dev/null`` Would change the current directory to ./a/d. Strangely this does not work. When I type cd ./a/d. The directory change works. However I cannot find out why the above does not work...

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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 the way but not sure. Please help

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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 case $1 in -EMAIL) MAILFLAG=Y shift break ;; esac done } main() { valArgs "$@" $JAVA_HOME/bin/java -d64 -jar WEB-INF/lib/test.jar "$@"

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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 I'm just wondering if this is the best way? Thanks

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  • Pipeline For Downloading and Processing Files In Unix/Linux Environment With Perl

    - by neversaint
    I have a list of files URLS where I want to download them: http://somedomain.com/foo1.gz http://somedomain.com/foo2.gz http://somedomain.com/foo3.gz What I want to do is the following for each file: Download foo1,2.. in parallel with wget and nohup. Every time it complete download process them with myscript.sh What I have is this: #! /usr/bin/perl @files = glob("foo*.gz"); foreach $file (@files) { my $downurls = "http://somedomain.com/".$file; system("nohup wget $file &"); system("./myscript.sh $file >> output.txt"); } The problem is that I can't tell the above pipeline when does the file finish downloading. So now it myscript.sh doesn't get executed properly. What's the right way to achieve this?

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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 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 case $1 in -EMAIL) MAILFLAG=Y shift break ;; esac done } main() { valArgs "$@" $JAVA_HOME/bin/java -d64 -jar WEB-INF/lib/test.jar "$@"

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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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  • 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 chrome firefox grep: firefox: No such file or directory What is going on here? I thought the $* passes multiple arguments to the shell script in sequence. I'm not mistyping anything in my input - and I the programs I want to kill (chrome and firefox) are open. Any help is appreciated.

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