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• Where are my ruby gems?

  - by scrrr

  Hello, Linux newbie question I guess.. How can I find out where gem installs the gems on my Ubuntu 10 system? I want to read gem sourcecode and perhaps change things up a bit.

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• Using Python to add/remove Ubuntu login script items

  - by codebox_rob

  I have written a Python application and would like to give my users the option of having the app automatically launch itself when the user logs in. It is important that the user is able to toggle this option on/off from within the app itself, rather than having to manually edit login scripts, so this needs to be done from within the Python code rather than from a shell script. The app is deployed on Ubuntu Linux, any suggestions for the best way of doing this?

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• Which posix flavor of regex does perl use?

  - by Kyle

  Specifically, I'm using the linux command: find . -regextype posix-extended -regex '' ... I just want to make sure the posix type I'm using is the type Perl uses, since that is by far the one I am most familiar with.

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• How to detect Unix terminal character encoding?

  - by Epaga

  Is there a way to detect the character encoding set in the terminal which is calling my Java program? In Windows I can call the "chcp" tool and parse the output. But what about in Linux or Mac?

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• Downloading all files from an FTP Server

  - by Navarr

  I need to download everything from an FTP server to hosting on a different server. I have shell access only to the server I'm downloading the files to. How, using the Linux FTP comnand, can I download every file, creating the directories needed for them in the process?

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• Graphing the DAG generated by make?

  - by Robert S. Barnes

  My understanding is that when make executes, it generates a DAG internally to represent all the dependencies in the project. Is there a way to get at that DAG and graph it, say using something like graphviz? I'm using gnu make on Linux.

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• Copy the contents of one partition to another partition hardrive

  - by user326613

  if i write this command in linux "dd if=/dev/sda of=/dev/sdb" it copy the whole dev/sda partition bit by bit to dev/sdb.....is there any way that i can just only copy the contents of /dev/sda to /dev/sdb and not the whole partition bit by bit......

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• How do I build git on Red Hat EL 3?

  - by Steve Hanov

  When you try to build git on Red Hat Enterprise Linux 3, you get an error: In file included from /usr/include/openssl/ssl.h:179, from git-compat-util.h:139, from builtin.h:4, from fast-import.c:147: /usr/include/openssl/kssl.h:72:18: krb5.h: No such file or directory

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• length of captured packets more than MTU

  - by kumar

  Hi, I m running iperf between two machines (linux) and I can observe the mtu of both the interfaces connected is 1500. I ran tcpdump to capture packets and I observed some packets have "length as 2962"....how come this is possible with mtu as only 1500? Please clarify. Thanks! Note: flags field is set as DF. and proto is TCP

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• How to link a directory in Ubuntu to a directory in Windows 7?

  - by user314314

  Hey guys. I've just installed Ubuntu 10.04, trying out linux for the first time. I'm wondering if it's possible to link my documents folder in Ubuntu to my documents folder in Windows, so that when I open the folder in Ubuntu, I am linked to the folder in Windows. Any ideas?

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• Do I need to purchase a license when I will be creating a website/webapp using mono?

  - by Hanseh

  I used asp.net in a project in an old company. The vs was licensed etc. Right now, I am planning to use mono since my new company is using linux based stuff and I heard that mono uses the .net framework etc. I just want to know if I need to purchase anything or is it ok to create a webapp using mono?

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• Using a checked STL implementation, anything available for free?

  - by Dan

  Have you used a checked STL implementation? Did it find bugs you were not expecting? Is there one I can try on Linux for free?

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• How to kill a process started with a different user without being root or sudoer?

  - by ATelesca

  Hello, in a Linux environment, I need to kill a process which has been started by user2 if I am user1 without being sudoers or using root. Do you know if there is a way of setting that when launching the process? Such as a list of users allowed to kill the process? Thanks

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• Rookie file permissions question

  - by Camran

  What is the ending 'r' for and the leading 'd' for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know about the leading 'd' and the trailing 'r'. Care to explain? Thanks

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• how can i use regex to get a certain string of a file

  - by chun

  Hi with linux bash shell , how can i use regex to get a certain string of a file by example: for filename *.tgz do "get the certain string of filename (in my case, get 2010.04.12 of file 2010.01.12myfile.tgz)" done or should I turn to perl Merci frank

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• java on all platforms

  - by noname

  if you wanna code a desktop application in java for windows, mac and linux, will the code be the same for all of them? and you just change the GUI so that the Windows application will be more Windows-like and so on? how does it work without digging into details?

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• Equivalent of print "-"x20 of perl in Bash or command line

  - by khmarbaise

  In perl you can simply write print "-" x 20 and you get a line with dashes...but i need the same thing in bash/commandline on linux without perl/(g)awk etc. any ideas? The intention is to use it in the -exec of the find command and i want to prevent using simple echo "---------" ...

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• Command line CSV viewer?

  - by Benjamin Oakes

  Anyone know of a command-line CSV viewer for Linux/OS X? I'm thinking of something like less but that spaces out the columns in a more readable way. (I'd be fine with opening it with OpenOffice Calc or Excel, but that's way too overpowered for just looking at the data like I need to.) Having horizontal and vertical scrolling would be great.

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• compare two files and get the output for the same lines

  - by garconcn

  How can I get the following output using linux command by comparing two text files? Thanks. file1: site110 site120 file2: domain1.com - site110 domain2.com - site111 domain3.com - site112 domain4.com - site113 domain5.com - site120 output: domain1.com - site110 domain5.com - site120

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• Cross-platform space remaining on volume using python

  - by Justin Waddell

  I need a way to determine the space remaining on a disk volume using python on linux, Windows and OS X. I'm currently parsing the output of the various system calls (df, dir) to accomplish this - is there a better way?

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• Please recommend a Java profiler

  - by Yuval F

  I am looking for the Java equivalent of gprof. I did a little Java profiling using System.getCurrentMillis(), and saw several GUI tools which seem too much. A good compromise could be a text-based Java profiler, preferably free or low-cost, which works in either Windows XP or Linux.

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• Good book for learning Bash shell?

  - by John Isaacks

  I want to learn how to write shell scripts. Particularly I want to write a svn post-commit script to upload files from a test server to a production server. I am sure I will want to write more as I get more into it. I have very little linux/unix knowledge. Can anyone recommend a good book?

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• How to you find out what group the current user belongs to via c++?

  - by ace

  Using my c++ program how can I find out what group the current user running my program belongs to? So my program need to figure out a couple of things : The current username of the user The group the user belongs to How can do the above 2 using c++ on a RedHat / Linux machine?

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• How to build libpthread.so from source code?

  - by Tristan Su

  I need a non-stripped version of libpthread.so for debugging. How can I compile it from source code? Host is Linux 2.6.

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• LD_DEBUG and java

  - by solotim

  When I set LD_DEBUG=files and run my Java program, I found many errors like this: /linux/depot/java-1.6.0_16_32/jre/lib/i386/libjava.so: error: symbol lookup error: undefined symbol: Java_sun_java2d_loops_MaskBlit_MaskBlit (fatal) This info is horrifying, but obviously my program runs OK. Can anyone tell me why this happens?

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