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• Programmatically dial a series of numbers on a modem?

  - by Nathan Long

  At work, we just got a large number exotic cellular devices that need to be programmed. To do this, you plug in a standard home telephone and dial a series of numbers, with pauses between them. To me, this is a task that begs to be automated, and we've got one Linux desktop (a test Asterisk machine) with a modem on it. Does anybody know an easy way to approach this task? I could install Ruby or Python on that desktop. I also know PHP, but I'm not sure how to run it outside of a server setup, and it seems silly to install Apache for this.

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• The best way to ensure only 1 copy of bash script is running?

  - by depesz

  What is the simplest/best way to ensure only 1 copy of given script is running - assuming it's bash on linux? At the moment I'm doing: ps -C script.name.sh > /dev/null 2>&1 || ./script.name.sh but it has several issues: it puts the check outside of script it doesn't let me run the same script from separate accounts - which I would like sometimes. -C checks only first 14 characters of process name Of course I can write my own pidfile handling, but I sense that there should be some simple way to do it.

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• Get local network interface addresses using only proc?

  - by Matt Joiner

  How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I've discovered the following: ifconfig makes use of SIOCGIFADDR, which requires open sockets and advance knowledge of all the interface names. It also isn't documented in any manual pages on Linux. proc contains /proc/net/dev, but this is a list of interface statistics. proc contains /proc/net/if_inet6, which is exactly what I need but for IPv6. Generally interfaces are easy to find in proc, but actual addresses are very rarely used except where explicitly part of some connection. There's a system call called getifaddrs, which is very much a "magical" function you'd expect to see in Windows. It's also implemented on BSD. However it's not very text-oriented, which makes it difficult to use from non-C languages.

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• How can I find out the original username a process was started with?

  - by szabgab

  There is a perl script that needs to run as root but the we must make sure the user who runs the script did not log-in originally as user foo as it will be removed during the script. So how can I find out if the user, who might have su-ed several times since she logged in has not impersonated 'foo' at any time in that chain? I found an interesting perl script that was calling the following two shell scripts, but I think that would only work on Solaris. my $shell_paren = `ps -ef | grep -v grep | awk \'{print \$2\" \"\$3}\' | egrep \"^@_\" | awk \'{print \$2}'`; my $parent_owner = `ps -ef | grep -v grep | awk \'{print \$1\" \"\$2}\' | grep @_ | awk \'{print \$1}\'`; This needs to work on both Linux and Solaris and I'd rather eliminate the repeated calls to he the shell and keep the whole thing in Perl.

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• help with installing clamav for remote apache server vs WAMP localserver

  - by Scarface

  Hey guys, I have never installed an extension before so I am not really sure where to start. I want to do 2 things: install clamav virus scanner http://sourceforge.net/projects/php-clamav/ on my remote server which is a linux apache setup using cpanel as a gui. install clamav on my localserver on my home computer which operates on windows and has WAMP server installed for server-side activity What is the difference between the two installation methods? What is required for each installation? If anyone can point me in the right direction in any way, I would really appreciate it. Even if it is just an article or tutorial on how to get started.

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• Convert a GTK python script to C

  - by Jessica

  The following script will take a screenshot on a Gnome desktop. import gtk.gdk w = gtk.gdk.get_default_root_window() sz = w.get_size() pb = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,False, 8, sz[0], sz[1]) pb = pb.get_from_drawable(w, w.get_colormap(), 0, 0, 0, 0, sz[0], sz[1]) if (pb != None): pb.save("screenshot.png", "png") print "Screenshot saved to screenshot.png." else: print "Unable to get the screenshot." Now, I've been trying to convert this to C and use it in one of the apps I am writing but so far i've been unsuccessful. Is there any what to do this in C (on Linux)? Thanks! Jess.

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• What is sys/user.h used for ?

  - by dada

  I was inspecting the code of a linux application and i saw the #include in one of the code files. I tried looking it up on opengroup.org but i couldn't find it there, this is what the sys directory looks like: http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/ . I guess it's not standard header file, but i checked it in my /usr/include/sys and it was there. What does it do and what it is used for ? If you can provide me with some manual for it, i would be grateful. Thanks.

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• How to support udev in a kernel module?

  - by Basilevs

  I'm porting a linux kernel module. It used to create a device file for itself (using dirty hacks with syscalls from kernelspace), but now I want to do this in udev. Where can I find documentation on supporting udev in in kernel module? Note that module itself is not a device driver. It serves as a multiplexor for a set of drivers. Therefor default ways of registering devices (i.e. pci ones) are not suitable for my task.

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• An MP3 parser to extract numbered frames?

  - by Xepoch

  I am writing a streaming application for MP3 (CBR). It is all passthru, meaning I don't have to decode/encode, I just need to pass on the data as I see it come through. I want to be able to count the MP3 frames as they passthru (and some other stuff like throughput calculations). According to the MP3 frame header spec, the sync word appears to be 11 bits of 1s, however I notice (naturally) that the frame payload which I should safely assume to be binary and thus it is not odd at all to see 11 1s in sequence. My questions: Is there a Unix/Linux MP3 parser utility (dd-style) that can pull numbered frames from an MP3 file/pipe? Any perl wisdom here? How does one delineate an MP3 header block from any other binary payload data? and lastly: Is a constant bitrate (CBR) MP3 defined by payload bytes or are the header bytes included in the aggregate # of bytes/bits per any given timeslice? Thanks,

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• What are the main reasons against the Windows Registry?

  - by dbemerlin

  If i want to develop a registry-like System for Linux, which Windows Registry design failures should i avoid? Which features would be absolutely necessary? What are the main concerns (security, ease-of-configuration, ...)? I think the Windows Registry was not a bad idea, just the implementation didn't fullfill the promises. A common place for configurations including for example apache config, database config or mail server config wouldn't be a bad idea and might improve maintainability, especially if it has options for (protected) remote access. I once worked on a kernel based solution but stopped because others said that registries are useless (because the windows registry is)... what do you think?

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• How can I concatenate two mp3 files with different bit rates

  - by Scott

  I have FFmpeg installed on my linux web server. When I execute the following code, I have intermittent results. I think I have figured out that the MP3s do not compile when they have different bitrates. exec ('cat '. $pair['source_file'] . ' ' . $pair['translated_word_file'] . '>' . $temp_mp3); I might have found some articles online that reference taking them apart and then bundling them back together at a consistent bitrates. I have confirmed that this won't really work with basic "cat" function and that "sox" can be used IF they have the same sample rate. The issue now becomes "What is the best way to get them to the same sample rate?"

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• Reading TCP Sequence Number Before Sending a Packet

  - by Sadeq Dousti

  I'm writing a C/C++ client-server program under Linux. Assume a message m is to be sent from the client to the server. Is it possible for the client to read the TCP sequence number of the packet which will carry m, before sending m? In fact, I'd like to append this sequence number to m, and send the resulting packet. (Well, things are more complicated, but let's keep it that simple. In fact, I'd like to apply authentication info to this sequence number, and then append it to m.) Moreover, is it possible for the server to read the TCP sequence number of the packet carrying m?

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• may be python error!!!

  - by bahar

  Hi I'm not familiar with python, I just want to check something so I tried to run a .py code in linux so I wrote : ./waf wifi-olsr-flowmon --plot which is a .py program after that whatever I want to run just see these error: /home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/wscript: error: Traceback (most recent call last): File "/home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/.waf-1.5.16-e6d03192b5ddfa5ef2c8d65308e48e42/wafadmin/Utils.py", line 197, in load_module exec(compile(code,file_path,'exec'),module.__dict__) File "/home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/wscript", line 32, in <module> import cflags # override the build profiles from waf ImportError: No module named cflags I dont know what does it mean or why it happened, would you please tell me what is the problem . Bests

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• Plot multiple files

  - by LucaB

  Hi I'd like to make an animation that illustrates the positions of some agents I'm simulating under Linux. Basically, I have some files named file00001.dat, file00002.dat and so on. I have to generate "something" that get files in order, and output an animated gif, a dynamic graph or whatever, that simulates the moving reading data from file. I have control on the files, meaning that I can put identifiers or everything I want. How would you achieve that? What programs would you use?

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• AUTOMATING EXCEL MACRO USING PYTHON

  - by user324056

  Hi all, Here is my question... I am using python in Linux to automate an excel. I have finished writing data into excel by using pyexcelerator package. Now comes the real challenge. I have to add another tab to the existing sheet and that tab should contain the macro run in the first tab. All these things should be automated. I googled a lot and found win32come to do a job in macro, but that was only for windows. Anyone have any idea of how to do this, or can you guide me with few suggestions. Thanks in advance.

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• Extract object (*.o) files from an iPhone static library

  - by Brett

  I have a set of iPhone static libraries (a *.a file) in which I only call a few of the classes from. I have used AR in the past (with linux libraries) to extract the object files from the static library, remove the unwanted object files and rearchive. However, when I try this with an iPhone compliled static library, I get the following error: ar: CustomiPhoneLib.a is a fat file (use libtool(1) or lipo(1) and ar(1) on it) ar: CustomiPhoneLib.a: Inappropriate file type or format Does anyone know how to extract the object files from an iphone compiled static library? Doing thie could potentially reduce the final file size.

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• Under *nix, how can I find a string within a file within a directory ?

  - by roberto

  Hi all. I'm using ubuntu linux, and I use bash from with a terminal emulator every day for many tasks. I would like to know how to find a string or a substring within a file that is within a particular directory. If I was knew the file which contained my target substring, I would just cat the file and pipe it through grep, thus: cat file | grep mysubstring But in this case, the pesky substring could be anywhere within a known directory. How do I hunt down my substring ?

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• Constructing a function call in C

  - by 0x6adb015

  Given that I have a pointer to a function (provided by dlsym() for example) and a linked list of typed arguments, how can I construct a C function call with those arguments? Example: struct param { enum type { INT32, INT64, STRING, BOOL } type; union { int i32; long long i64; char *str; bool b; } value; struct param *next; }; int call_this(int (*function)(), struct param *args) { int result; /* magic here that calls function(), which has a prototype of f(int, long long, char *, bool); , when args consist of a linked list of INT32, INT64, STRING, BOOL types. */ return result; } The OS is Linux. I would like the solution to be portable across MIPS, PPC and x86 (all 32 bits) architecture, using GCC as the compiler. Thanks!

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• What's the best way to build software to not require the newest glibc?

  - by ZorbaTHut

  I'm attempting to build a binary package that can be run on multiple Linux distributions. It's currently built on Ubuntu 10.04, but it fails on Ubuntu 8.04 with the following error: ./test: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.11' not found (required by ./test) ./test: /usr/lib/libstdc.so.6: version `GLIBC_2.11' not found (required by ./test) What's the preferred way to solve this problem? Is there a way to install an old glibc on a new box and build against it, or do I have to build on an old distribution? And if I build against an old glibc, will it work on a new glibc? Or, alternatively, are there just some handy compiler flags or packages I could install to solve the problem?

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• Combining several static archives into a new one

  - by knight666

  I'm making a game engine for mobile devices. I want to compile my code, link it against a few static libraries and then combine my compiled code with those static libraries to form a new static library. However, my Google Fu is abandoning me. Suppose I have static libraries a.a, b.a and c.a and my code. I want to compile all that into awesome.a. How can I do that? I'm using CodeSourcery's arm-none-linux-gnueabi-ar by the way. Thanks in advance.

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• Do you know of a C dictionary that supports COW transactions?

  - by Tim Post

  I'm looking for a key - value dictionary library written in C that supports a theoretically unlimited number of cheap transactions. I'd like to have one dictionary in memory, with hundreds of threads starting transactions, possibly modifying the dictionary, ending (completing) the transaction or potentially aborting the transaction. Only 50% of the time will these threads actually modify the dictionary. Most dictionary transaction implementations that I've seen copy always, instead of copying on write, whenever a transaction is started. Given the expected size ( 1GB) of the dictionary, I'm hoping to find something that COWs only when something is actually changed during a transaction. I'm also hoping for something that is packaged by most major GNU/Linux distributions. Any suggestions or links are very much appreciated.

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• What's the best way to build software that doesn't require the newest glibc?

  - by ZorbaTHut

  I'm attempting to build a binary package that can be run on multiple Linux distributions. It's currently built on Ubuntu 10.04, but it fails on Ubuntu 8.04 with the following error: ./test: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.11' not found (required by ./test) ./test: /usr/lib/libstdc.so.6: version `GLIBC_2.11' not found (required by ./test) What's the preferred way to solve this problem? Is there a way to install an old glibc on a new box and build against it, or do I have to build on an old distribution? And if I build against an old glibc, will it work on a new glibc? Or, alternatively, are there just some handy compiler flags or packages I could install to solve the problem?

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• Keeping track of dirty blocks on a block device

  - by mikeY

  I'm looking for a way to keep track of what blocks on a block device are modified after a point in time. How I eventually want to use this for is to keep two 2TB disks in sync, one which only comes online (connected through USB) once a month. Without knowing what blocks have been modified, I have to go through the whole 2TB every time. I'm using a recent GNU/Linux OS and have C and Python experience. I'm hoping to avoid writing kernel level code as I don't have any experience in that area whatsoever. My current theory is that there should be some hooks somewhere where my code can get called when a disk flush is performed. Any ideas?

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• Help with a cryptic error message with KGDB - Bogus trace status reply from target: E22

  - by fortran

  Hi, I'm using gdb to connect to a 2.6.31.13 linux kernel patched with KGDB over Ethernet, and when I try to detach the debugger I get this: (gdb) quit A debugging session is active. Inferior 1 [Remote target] will be killed. Quit anyway? (y or n) y Bogus trace status reply from target: E22 after that the session is still open, I can keep going on and on with ctrl+d, and the debugger doesn't exit. I've searched for that message in google and there are just 5 results (and none of them are useful :-/ ). Any idea of what could it be and how to fix it?

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• Webservice for serial port devices

  - by camx

  Hi I want to create a remote webservice for an application that is now avaliable only localy. This application controlls three devices (each is controlled separately) connected on serial port. The problem is that I don't know how to take care of passing back information that a device return requested data. For example - I send move command to the motion device (which is very slow and can take a minute or more). Can I just set a big timeout on the client side (and server side) and return for example a true/false if operation is completed or is this a bad idea? Is SOAP with big timeouts ok? And the other question is if Mono on Linux (Ubuntu 9.10, Mono 2.4) is stable enought for making a web service or should I chose Java or some other language? I'm open for recommendations. Thanks for your help!

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