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  • best approah (security) to do some admin work through web page in Linux?

    - by Data-Base
    Hello, I want to build a web based admin tools that allow the system admin to run pre-configured commands and scripts through a web page (simple and limited webmin), what is the best approach? I already started with Ubuntu installing LAMP and give the user www-data root's privileges !!! as I learned (please check the link) this is a really bad move !!!, so how to build such web-based system without the security risk? cheers

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  • In a Linux user space process what is the address of the vsyscall page?

    - by TomMD
    I would like to acquire the address of the vsyscall page for my own uses. I only have two ideas here: alter the compiler to store this information in some known location after it is given to __start, or read /proc/[pid]/maps. I really don't want to read /proc/ as that is slow and shouldn't be necessary. I also don't want to make compiler modifications. Does anyone have an alternative? Is there a symbol I should know about? Its at the point I'm tempted to stuff this functionality into an ioctl call in a module I've developed as part of this work!

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  • Linux shell to restrict sftp users to their home directories?

    - by hfidgen
    I need to give SFTP access to a directory within my webroot on my server. I've set up ben_files as a user and have set his/her home directory to /var/www/vhosts/mydomain.com/files That's all fine if he/she connects with plain old FTP - he's/she's restricted just to that directory, but to enable SFTP I had to add him/her to bin/bash shell, which suddenly opens up my entire server... Is there a way of giving him/her SFTP access but without opening up all my directories? I'd really like him restricted to only his/her home ;)

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  • Linux server, locating files containing nothing but 4 specific lines.

    - by Denis
    Hi, I'm dealing with a compromised website, in which hackers injected an htaccess instruction to redirect traffic. I can easily locate .htaccess files that contain the forwarding hack, BUT in cases where the directory already contained an htaccess file, they appended the dangerous instructions, so I cannot just deleted any htaccess file or could harm the site by letting formerly pw-protected directories wide open, or urlrewrite instructions (WordPress) be deleted, etc. I could not find the way to locate files that only contain those 4 lines of redirect hack, could you shed some light ? So far, using find . -type f -exec grep -q targetpiratedomain {} \; -exec echo rm {} \; Thanks !

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  • Which technology(s) / language(s) to write linux web application/service? [closed]

    - by Lee Tickett
    I am currently playing with some open source home automation software www.domotiga.nl The software is built in Gambas2 (a graphical programming language similar to visual basic). I am considering building something similar or porting domotiga to a server based application/service. The application would need a web front end and i will likely be developing in debian (arm). But i'm not sure if php or python are suitable for server based applications which need to be always running (collecting data etc) rather than just running when accessed. Which technology(s) / language(s) would you suggest i look into? I used to do a lot of Visual Basic, then VB.NET, now C# and have played with php a few years back- but don't really want this to sway the decision too much as i should be able to pickup whatever language if i decide to proceed.

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  • How to check if a process is running or got segfaulted or terminated in linux from its pid in my mai

    - by rkbang
    Hello all, I am invoking several processes in my main and I can get the pid of that processes. Now I want to wait until all this processes have been finished and then clear the shared memory block from my parent process. Also if any of the process not finished and segfaulted I want to kill that process. So how to check from the pid of processes in my parent process code that a process is finished without any error or it gave broke down becoz of runtime error or any other cause, so that I can kill that process. Also what if I want to see the status of some other process which is not a child process but its pid is known. Code is appreciated( I am not looking for script but code ).

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  • PHP & bash; Linux; Compile my own function

    - by flienteen
    Hi. I would like to make my own program but I have no idea how.. for example I want to make a typical 'Hello $user' program. So.. +-- hi ¦   +-- hi.sh ¦   +-- hi_to.sh hi.sh #!/bin/bash ~/hi/hi_to.sh $1 hi_to.sh #!/usr/bin/php <?php echo "\nHellO ".$argv[1]."\n"; ?> Run it in terminal: me:~/hi ? ./hi.sh User HellO User and my question is: how to compile all this files into one bash program?

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  • Why do virtual memory addresses for linux binaries start at 0x8048000?

    - by muteW
    Disassembling an ELF binary on a Ubuntu x86 system I couldn't help but notice that the code(.text) section starts from the virtual address 0x8048000 and all lower memory addresses seem to be unused. This seems to be rather wasteful and all Google turns up is either folklore involving STACK_TOP or protection against null-pointer dereferences. The latter case looks like it can be fixed by using a single page instead of leaving a 128MB gap. So my question is this - is there a definitive answer to why the layout has been fixed to these values or is it just an arbitrary choice?

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  • Is there a way to inspect the current rpath on Linux?

    - by Justicle
    I'm aware that it is possible to use 'readelf -d | grep RPATH' to inspect a given binary from the shell, but is it possible to do this within a process? Something like (my completely made up system call): /* get a copy of current rpath into buffer */ sys_get_current_rpath(&buffer); I'm trying to diagnose some suspect SO linking issues in our codebase, and would like to inspect the RPATH this way if possible (I'd rather not have to spawn an external script).

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  • Why can't a bind linux service to the loop-back only?

    - by Jon Trauntvein
    I am writing a server application that will provide a service on an ephemeral port that I only want accessible on the loopback interface. In order to do this, I am writing code like the following: struct sockaddr_in bind_addr; memset(&bind_addr,0,sizeof(bind_addr)); bind_addr.sin_family = AF_INET; bind_addr.sin_port = 0; bind_addr.sin_addr.s_addr = htonl(inet_addr("127.0.0.1")); rcd = ::bind( socket_handle, reinterpret_cast<struct sockaddr *>(&bind_addr), sizeof(bind_addr)); The return value for this call to bind() is -1 and the value of errno is 99 (Cannot assign requested address). Is this failing because inet_addr() already returns its result in network order or is there some other reason?

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  • How can I convert spaces to tabs in Vim or Linux?

    - by cwd
    I've looked over several questions on Stack Overflow for how to convert spaces to tabs without finding what I need. There seem to be more questions about how to convert tabs to spaces, but I'm trying to do the opposite. In Vim I've tried :retab and :retab! without luck, but I believe those are actually for going from tabs to spaces anyways. I tried both expand and unexpand at the command prompt without any luck. Here is the file in question: http://gdata-python-client.googlecode.com/hg-history/a9ed9edefd61a0ba0e18c43e448472051821003a/samples/docs/docs_v3_example.py How can I convert leading spaces to tabs using either Vim or the shell?

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  • Best practice for C++ audio capture API under Linux?

    - by braddock
    I need to create a C++ application with a simple audio recording from microphone functionality. I can't say that there aren't enough audio APIs to do this! Pulse, ALSA, /dev/dsp, OpenAL, etc. My question is what is the current "Best practice" API? Pulse seems supported by most modern distros, but seems almost devoid of documentation. Will OpenAL be supported across different distros, or is it too obscure? Have I missed any? Is there not a simple answer? thanks!

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  • Running commands though PHP/Perl scripts as a priviledged user on Linux.

    - by jtd
    Background: I am writing a script for a company that will allow users to create FTP accounts through a web interface. In the background, the script must run a bunch of commands: Add the user to the system (useradd) Open and edit various files mail the user via sendmail and a few other things... I'm basically looking for the most secure way of doing this. I've heard of the setuid method, the sudo method, and of course, running httpd as a priviledged user. There will be sanity checks on the data entered of course before any commands are executed (ie. only alphanumeric characters in usernames) What is the method used by the popular scripts out there (webmin for example), as it must be fairly secure?

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  • Linux: Find all symlinks of a given 'original' file? (reverse 'readlink')

    - by sdaau
    Hi all, Consider the following command line snippet: $ cd /tmp/ $ mkdir dirA $ mkdir dirB $ echo "the contents of the 'original' file" > orig.file $ ls -la orig.file -rw-r--r-- 1 $USER $USER 36 2010-12-26 00:57 orig.file # create symlinks in dirA and dirB that point to /tmp/orig.file: $ ln -s $(pwd)/orig.file $(pwd)/dirA/ $ ln -s $(pwd)/orig.file $(pwd)/dirB/lorig.file $ ls -la dirA/ dirB/ dirA/: total 44 drwxr-xr-x 2 $USER $USER 4096 2010-12-26 00:57 . drwxrwxrwt 20 root root 36864 2010-12-26 00:57 .. lrwxrwxrwx 1 $USER $USER 14 2010-12-26 00:57 orig.file -> /tmp/orig.file dirB/: total 44 drwxr-xr-x 2 $USER $USER 4096 2010-12-26 00:58 . drwxrwxrwt 20 root root 36864 2010-12-26 00:57 .. lrwxrwxrwx 1 $USER $USER 14 2010-12-26 00:58 lorig.file -> /tmp/orig.file At this point, I can use readling to see what is the 'original' (well, I guess the usual term here is either 'target' or 'source', but those in my mind can be opposite concepts as well, so I'll just call it 'original') file of the symlinks, i.e. $ readlink -f dirA/orig.file /tmp/orig.file $ readlink -f dirB/lorig.file /tmp/orig.file ... However, what I'd like to know is - is there a command I could run on the 'original' file, and find all the symlinks that point to it? In other words, something like (pseudo): $ getsymlinks /tmp/orig.file /tmp/dirA/orig.file /tmp/dirB/lorig.file Thanks in advance for any comments, Cheers!

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  • How can I do a 'where' clause in Linux shell?

    - by Hoa
    I have a CSV file and I would like to filter all the lines where the 19th column has two or more characters. I know the individual pieces but can't figure out how to glue them together. First I have to cat the file. The following prints the 19th column awk -F "," '{print $19}' file.txt awk also has length and ifs And I know it all has to be glued together using pipes. I'm just getting stuck at the exact syntax since I have not done much bash programming before.

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  • How to set baud rate to 307200 on Linux?

    - by cairol
    Basically I'm using the following code to set the baud rate of a serial port: struct termios options; tcgetattr(fd, &options); cfsetispeed(&options, B115200); cfsetospeed(&options, B115200); tcsetattr(fd, TCSANOW, &options); This works very well. But know I have to communicate with a device that uses a baud rate of 307200. How can I set that? cfsetispeed(&options, B307200); doesn't work, there is no B307200 defined.

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  • Linux How to print all the files with the same prefix after searching for them?

    - by Alyx
    I need to search through a directory which contains many sub directories, each which contain files. The files read as follows question1234_01, where 1234 are random digits and the suffix _01 is the number of messages that contain the prefix, meaning they are apart of the same continuing thread. find . -name 'quest*' | cut -d_ -f1 | awk '{print $1}' | uniq -c | sort -n example output: 1 quest1234 10 quest1523 This searches for all the files then sorts them in order. What I want to do is print all the files which end up having the most occurrences, in my example the one with 10 matches. So it should only output quest1523_01 - 11

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  • How to restart Linux from inside a C++ program?

    - by Dave K
    I have a Qt 4 GUI where I need to have a option in a drop-down menu that allows the user to choose to restart the computer. I realize this might seem redunant with the ability to restart the computer in other ways, but the choice needs to stay there. I've tried using system() to call the following: a suid-root shell script a non-suid shell script a suid-root binary program and all of them just cause reboot: must be superuser to be printed. Using system() to call reboot directly does the same thing. I'm not especially attached to using system() to do this, but it seemed like the most direct choice. How can I reboot the system from the GUI?

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