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  • linux script, standard directory locations.

    - by Thingomy
    I am trying to write a bash script to do a task, I have done pretty well so far, and have it working to an extent, but I want to set it up so it's distributable to other people, and will be opening it up as open source, so I want to start doing things the "conventional" way. Unfortunately I'm not all that sure what the conventional way is. Ideally I want a link to an in depth online resource that discusses this and surrounding topics in depth, but I'm having difficulty finding keywords that will locate this on google. At the start of my script I set a bunch of global variables that store the names of the dirs that it will be accessing, this means that I can modify the dir's quickly, but this is programming shortcuts, not user shortcuts, I can't tell the users that they have to fiddle with this stuff. Also, I need for individual users' settings not to get wiped out on every upgrade. Questions: Name of settings folder: ~/.foo/ -- this is well and good, but how do I keep my working copy and my development copy separate? tweek the reference in the source of the dev version? If my program needs to maintain and update library of data (gps tracklog data in this case) where should this directory be? the user will need to access some of this data, but it's mostly for internal use. I personally work in cygwin, and I like to keep this data on separate drive, so the path is wierd, I suspect many users could find this. for a default however I'm thinking ~/gpsdata/ -- would this be normal, or should I hard code a system that ask the user at first run where to put it, and stores this in the settings folder? whatever happens I'm going ot have to store the directory reference in a file in the settings folder. The program needs a data "inbox" that is a folder that the user can dump files, then run the script to process these files. I was thinking ~/gpsdata/in/ ?? though there will always be an option to add a file or folder to the command line to use that as well (it processed files all locations listed, including the "inbox") Where should the script its self go? it's already smart enough that it can create all of it's ancillary/settings files (once I figure out the "correct" directory) if run with "./foo --setup" I could shove it in /usr/bin/ or /bin or ~/.foo/bin (and add that to the path) what's normal? I need to store login details for a web service that it will connect to (using curl -u if it matters) plan on including a setting whereby it asks for a username and password every execution, but it currently stores it plane text in a file in ~/.foo/ -- I know, this is not good. The webservice (osm.org) does support oauth, but I have no idea how to get curl to use it -- getting curl to speak to the service in the first place was a hack. Is there a simple way to do a really basic encryption on a file like this to deter idiots armed with notepad? Sorry for the list of questions, I believe they are closely related enough for a single post. This is all stuff that stabbing at, but would like clarification/confirmation over.

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  • Reading and writing to SysV shared memory without synchronization (use of semaphores, C/C++, Linux)

    - by user363778
    Hi, I use SysV shared memory to let two processes communicate with each other. I do not want the code to become to complex so I wondered if I really had to use semaphores to synchronize the access to the shared memory. In my C/C++ program the parent process reads from the shared memory and the child process writes to the shared memory. I wrote two test applications to see if I could produce some kind of error like a segmentation fault, but I couldn't (Ubuntu 10.04 64bit). Even two processes writing non stop in a while loop to the same shared memory did not produce any error. I hope someone has experience concerning this matter and can tell me if I really must use semaphores to synchronize the access or if I am OK without synchronization. Thanks

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  • Best way to daemonize Java application on Linux

    - by SyBer
    Hi. While I found this question being answered here on SW several times, I didn't find a concluding answer what is the best approach. I'm not looking to use any external wrapper, as I found them launching the java process under a nice level lower then themselves which potentially lowers the performance, so it seems only the shell methods are left. I so far found 3 different shell methods: start-stop-daemon RedHat daemon init.d function nohup on start / disown after start What you people are using, and can recommend as the most reliable method? Thanks.

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  • Linux Directory Access Problem: Permission Denied """In Root"""

    - by RBA
    Hi, When login through root on HP-tru Unix server, I am trying to access a directory, it is saying "Permission Denied".. Also, an sh file is also not able to execute through same root access.. I have checked the permission of the directory as well as for sh file through ls-ltr.. It is also fine.. Root System rwx-rwx-rwx-- What could be the possible cause, and how to correct it.. Thanks.

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  • run multiple programs in linux

    - by Betamoo
    I am trying to write a .sh file that runs many programs simultaneously I tried this prog1 prog2 But that runs prog1 then waits until prog1 ends and then starts prog2... So how can I run them in parallel? Thanks

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  • Linux - Want To Check For Possible Duplicate Directories (Probably RegEx Needed)

    - by NoLongerHere
    Hi, I have a directory which contains several directories as follows: /Music/ /Music/JoeBlogs-Back_In_Black-1980 /Music/JoeBlogs-Back_In_Black-(Remastered)-2003 /Music/JoeBlogs-Back_In_Black-(ReIssue)-1987 /Music/JoeBlogs-Thunder_Man-1947 I want a script to go through and tell me when there are 'possible' duplicates, in the example above it would pick up the following as possible duplicates from the directory list: /Music/JoeBlogs-Back_In_Black-1980 /Music/JoeBlogs-Back_In_Black-(Remastered)-2003 /Music/JoeBlogs-Back_In_Black-(ReIssue)-1987 1) Is this possible? 2) If so please help!

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  • [Linux] domain socket "sendto" encounter "errno 111, connection refused"

    - by z.cHris
    I am using domain socket to get values from another process, like A to get a value from B, It works well for months. But recently, A is failed during "sendto" message to B with "errno 111, connection refused" occasionally. I checked the B domain socket bind file, it is exists. I also do some tests in another machine, also works well. So, does anyone encounter this problem before? Can anyone have some clues what might be probably wrong in this scenario? Thanks very much.

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  • PDF to LaTex Linux

    - by Mawnster
    I know how make a pdf from LaTex. Is there a way to extract the LaTex from a PDF I created earlier? How about if someone sends me a PDF and I like the formatting. Can I extract the LaTex from it?

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  • C++ IDE for Linux with smart reference searching

    - by Dmitry Yudakov
    Is there an IDE supporting C++ with REALLY smart searching of references? By 'reference' I mean usage of a class (or its member), variable, function in the whole Project or Workspace. There's lots of IDE providing it. Some of them seem just to search for the text with same name giving lots of stuff, others are smarter and check the context (like class boundaries, namespace) but aren't accurate enough. The best I've tried so far was Visual SlickEdit, but still there's more to wish. class C1 { int foo; }; class C2 { int foo; }; For example in this situation when searching for C1::foo references I don't want C2::foo to be shown too. So, is there an IDE that would be so smart?

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  • How to control virtual memory management in linux?

    - by chmike
    I'm writing a program that uses an mmap file to hold a huge buffer organized as an array of 64 MB blocks. The blocks are used to aggregate data received from different hosts through the network. As a consequence the total data size written in each block is not known in advance. Most of the time it is only 2MB but in some cases it can be up to 20MB or more. The data doesn't stay long in the buffer. 90% is deleted after less than a second and the rest is transmitted to another host. I would like to know if there is a way to tell the virtual memory manager that ram pages are not dirty anymore when data is deleted. Should I use mmap and munmap when a block is used and released to control the virtual memory ? What would be the overhead of doing this ? Also, some colleagues expressed concerns about the performance impact of allocating such a big mmap space. I expect it to behave like a swap file so that only dirty pages are to be considered.

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  • fopen in C(Linux) returns "Too many open files"

    - by liv2hak
    static char filename[128] = "trace.txt"; g_file = fopen(filename, "w"); if(NULL == g_file) { printf("Cannot open file %s.error %s\n",filename,strerror(errno)); exit(1); } I am trying to open a empty text file named trace.txt in write mode (in my working directory.) The program is creating an empty file trace.txt in my directory.but the check (NULL == g_file) is returning true and it is returning error code 24 (Too many open files.).Any idea why this is.This is the first file I am opening in my program.

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  • Can class of linux device be NULL?

    - by Basilevs
    Can I pass NULL pointer to the first argument of device_create function? I'm using device_create() to create character device file in sysfs. This file don't represent any physical device (it is used to provide an access to a set of devices connected to various buses). What class should I use with device_create() to create such a file?

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  • linux cron job error

    - by bell
    I have setup a cron job to run a php file every 30 minutes, lynx -source public_html/scripts/file.php the result comes through to an email but seems to get this error Can't Access `file://localhost/home/username/public_html/scripts/file.php' Alert!: Unable to access document. lynx: Can't access startfile any advice would be much appreciated

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  • Apache and linux file permissions can't browse file or directories

    - by dardub
    I just copied my magento site over to a local server running CentOS 5.4. The browser said it can't locate the location of the stylesheets. The stylesheets are within /skin/frontend/my_new_interface/design2/css. I tried to view in the browser and I can't view any of the files within the css directory. I verified a million times that I'm typing in the correct location. I can view files within /skin/frontend/my_new_interface/design2. Can't browse directories within browser however. I typed in ls -l css and get: -rwxr-xr-x 1 apache apache listed for all the files I tried chmod -R 755 and the directories I changed the apache conf Options Indexes But still when I browse the directories I get Forbidden. However, in another fresh installation of magento in the same www dir, I am able to browse directories. As far as I can tell both installations have same ownership and permissions. I also tried find . -type f -exec chmod 644 {} \; find . -type d -exec chmod 755 {} \; which was recommended in the magento wiki I've just run out of ideas.

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  • Move/copy files/folder in linux/solaris using only bash built-ins

    - by KullDox
    There was a situation when somebody moved the whole rootdir into a subdir on a remote system, thus all the system tools like cp, mv, etc didn't work anymore. We had an active session though but couldn't find a way to copy/move the files back using only bash built-ins. Do somebody know of a way to achieve this? I even thought about copy the cp or mv binary in the currentdir with while read -r; do echo $LINE; done and then redirect this to a file, but it didn't work. Guess because of all the special non printable chars in a binary file that can't be copied/displayed using echo. thanks.

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  • Linux / C++: Get Internet IP Address (not local computer's IP)

    - by Levo
    How can I programmatically get the Internet IP address? 1) If the computer is directly connected to the Internet using a USB modem. 2) If the computer is connected to the internet via another computer or a modem/router. I there a way to do both? P.S. This link gives exactly the Internet IP, but how can I use it in my program?

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  • linux ps aux command

    - by lakshmipathi
    How obtain the running process with absolute path name from ps command 13598 ? Ssl 0:00 /opt/something --run-id 2 -n /home/laks/f1 -l l.log I need the output as - /opt/something --run-id 2 -n /home/laks/f1 -l l.log

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  • Linux script to kill process listening on a particular port

    - by Evgeny
    I have a process that listens on a TCP port (?0003). From time to time it crashes - badly. It stops working, but continues hogging the port for some time, so I can't even restart it. I'm looking to automate this. What I do right now is: netstat -ntlp |grep -P "\*\:\d0003" To see what the PID is and then: kill -9 <pid> Does anyone have a script (or EXE for that matter) that would link the two steps together, ie. parse the PID from the first command and pass it to the second?

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  • How do I rename a process on Linux?

    - by jemfinch
    I'm using Python, for what it's worth, but will accept answers in any applicable language. I've tried writing to /proc/$pid/cmdline, but that's a readonly file. I've tried assigning a new string to sys.argv[0], but that has no perceptible impact. Are there any other possibilities? My program is executing processes via os.system (equivalent to system(3)) so a general, *NIX-based solution using an additional spawning process would be fine.

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  • Tools for displaying text, powerpoint style, in linux

    - by Will Mc
    I have a problem where I need a way to display a repeating series of "images" on a computer monitor. Specifically, given a series of text files, I'd like a way to display the contents of said files on a screen in a way much like a powerpoint would. My current thoughts are to find some tool that will take in a text file of some format, and then output an image which contains the text from the file. Then I'd put it in a directory and have some Slideshow program continuously go between the images in that directory. It's a very hacky solution, obviously. So, does anyone know of tools that would do such a thing? Or is there a better way to do this? I've looked into the library libgd2, but it doesn't seem to support text-wrapping for images, which is something I'd need. Thanks!

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  • Which way to go in Linux 3D programming?

    - by Tek
    I'm looking for some answers for a project I'm thinking of. I've searched and from what I understand (correct me if I'm wrong) the only way the program I want to make will work is through 3D application. Let me explain. I plan to make a studio production program but it's unique in the fact that I want to be able to make it fluid. Let me explain. Imagine Microsoft's Surface program where you're able to touch and drag pictures across the screen. Instead of pictures I want them to be sound samples (wavs,mp3,etc). Of course instead the input will be with the mouse but if I ever do finish the project I would totally add touch screen input compatibility! Anyway, I'm guessing there's "physics" to do with it which is why I'm thinking that even though it'll be a 2D application I'll need to code it in a 3D environment. Assuming that I'm correct in how I want to approach my project, where can I start learning about 3D programming? I actually come from PHP programming which will make C++ easier for me to learn. But I don't even know where to start. If I'm not wrong OpenGL is the most up to date API as far as I know. Anyway, please give me your insights guys. I could really use some guidance here since I could totally be wrong in everything that I wrote :)

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