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• Quick, Linux-compatible unit-aware calculator

  - by endolith

  I want to be able to press a keyboard combination, start typing a mathematical expression that includes units and slightly advanced math (not just a four-function calculator), and get a result immediately, in units that I specify, that I can copy and paste. Currently I open Firefox and press Ctrl+K, type in the search box, and it usually gives me a result in the drop-down from Google Calculator. It doesn't always, though, so I press "=" at the end, wait for a result, remove the equals, wait for a result, realize it doesn't understand the way I typed a unit, open the result in a new tab, etc. it sucks. Wolfram Alpha is smarter, but very much slower, and the output is all images, not text, and I don't have a quick widget for it, if such a thing could even exist. GNU units has a ton of units, which is great, and I can define my own units, which is great, but they have to be written in specific, unintuitive ways, it doesn't handle much advanced math, and I'd need to open a terminal, start units, etc. I hate the command line. I wasted a lot of time trying to make front-ends for units in Deskbar and Launchy, but I'm not a real coder and I don't use either of those anymore. Any other solutions or enhancements of these?

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• Exporting Environment Variables in Ubuntu Linux

  - by stanigator

  I know many people have asked about environment variables before, but I am having a hard time dealing with these paths while ensuring I don't mess around with the original settings. How would you go about executing these commands in Ubuntu in terms of environment variables? Thanks in advance! Please put /home/stanley/Downloads/ns-allinone-2.34/bin:/home/stanley/Downloads/ns-allinone-2.34/tcl8.4.18/unix:/home/stanley/Downloads/ns-allinone-2.34/tk8.4.18/unix into your PATH environment; so that you'll be able to run itm/tclsh/wish/xgraph. IMPORTANT NOTICES: (1) You MUST put /home/stanley/Downloads/ns-allinone-2.34/otcl-1.13, /home/stanley/Downloads/ns-allinone-2.34/lib, into your LD_LIBRARY_PATH environment variable. If it complains about X libraries, add path to your X libraries into LD_LIBRARY_PATH. If you are using csh, you can set it like: setenv LD_LIBRARY_PATH If you are using sh, you can set it like: export LD_LIBRARY_PATH= (2) You MUST put /home/stanley/Downloads/ns-allinone-2.34/tcl8.4.18/library into your TCL_LIBRARY environmental variable. Otherwise ns/nam will complain during startup.

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• Linux command to concatenate audio files and output them to ogg

  - by hasen j

  What command-line tools do I need in order to concatenate several audio files and output them as one ogg (and/or mp3)? If you can provide the complete command to concatenate and output to ogg, that would be awesome. Edit: Input files (in my case, currently) are in wma format, but ideally it should be flexible enough to support a wide range of popular formats. Edit2: Just to clarify, I don't want to merge all wmas in a certain directory, I just want to concatenate 2 or 3 files into one. Thanks for the proposed solutions, but they all seem to require creating temporary files, if possible at all, I'd like to avoid that.

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• Linux process management

  - by tanascius

  Hello, I started a long running background-process (dd with /etc/urandom) in my ssh console. Later I had to disconnect. When I logged in, again (this time directly, without ssh), the process still seemed to to run. I am not sure what happened - I did not use disown. When I logged in later, the process was not listed in top at first, but after a while it reclaimed a high CPU percentage, as I expected. So I assume dd is still running. Now, I'd like to see the progress. I use kill -USR1 <pid> but nothing is printed. Is there any way to get the output again?

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• Linux laptop encryption

  - by kaerast

  What are my options for encrypting the /home directories of my Ubuntu laptops? They are currently setup without any encryption and some have /home as a separate partition whilst others don't. Most of these laptops are single-user standalone laptops which are out on the road a lot. Is ecryptfs and the encrypted Private directory good enough or are there better, more secure, options? If somebody got hold of the laptop, how easy would it be for them to gain access to the encrypted files? Similar questions for encrypted lvm, truecrypt and any other solution I may not be aware of.

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• What does S in linux file properties mean?

  - by penguin

  I'm creating directories and changing the permissions of them in perl with the following code: umask 0000; mkdir $path, 0770; chown $userid, $groupid, $path; Now when I do ls -l on a directory I've just created, they are as follows: drwxrws--- 2 user group 4096 Nov 3 15:34 test1 I notice for the group permissions, there's an s instead of x. Even if I chmod manually to remove all permissions for the user and group ("chmod g=" and "chmod u=", it's still there: d-----S--- 2 user group 4096 Nov 3 15:36 test2 The internet suggests S means everything in the folder is run as su or something? I don't quite understand what it means but I figure I should understand seeing as these are webroots so if there's a security implication, I ought to be aware of it. Many thanks for your help!

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• Linux NIC Bonding Issue (CentOS 4 / RHEL 3)

  - by jinanwow

  I am having an issue with bonding NICs on CentOS 4. It appears the bonding driver does work, but it is stuck in round-robin mode and I am trying to get to active-backup. The current config is: ifcfg-bond0 DEVICE=bond0 IPADDR=192.168.204.18 NETMASK=255.255.255.0 ONBOOT=yes BOOTPROTO=none USERCTL=no TYPE=Bonding BONDING_OPTS="mode=1 miimon=100" ifcfg-eth1 DEVICE=eth1 BOOTPROTO=none ONBOOT=yes TYPE=Ethernet MASTER=bond0 SLAVE=yes ifcfg-eth3 DEVICE=eth3 ONBOOT=yes BOOTPROTO=none TYPE=Ethernet MASTER=bond0 SLAVE=yes cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v2.6.3-rh (June 8, 2005) Bonding Mode: load balancing (round-robin) MII Status: up MII Polling Interval (ms): 0 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth1 MII Status: up Link Failure Count: 0 Permanent HW addr: 00:17:a4:8f:94:b1 Slave Interface: eth3 MII Status: up Link Failure Count: 0 Permanent HW addr: 00:1b:21:56:b8:69 cat /etc/modprobe.conf alias eth0 tg3 alias eth1 tg3 alias eth3 e1000 alias eth2 e1000 alias bond0 bonding options bond0 mode=1 miimon=100 I have tried moving the bonding information out of the ifcfg-bond0 into the modprobe configuration file. It seems that it is stuck in RR and I am trying to get it into the Active-backup (mode 1) state. Any ideas what would be causing this issue?

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• Linux Flash Player with 2 Monitors: always full-screen on primary monitor

  - by CarlF

  My setup at home uses a laptop, with a larger external monitor in addition to the built-in LCD panel, which is primary. I can see the larger monitor from the rest of the room and use it as my TV, for playing DVDs and various types of web video. However, it isn't ideal for Flash video. For instance, if I watch a video from Hulu or any other Flash-based site, I can expand it to full-screen mode. However, no matter which monitor the browser window is on, the full-screen mode is always on the laptop LCD panel, which is both too small and not visible from most of the room. Does anyone know of a way to force the Flash video to play full-screen on the monitor I select instead of the primary? My video chipset is NVidia, using kernel 2.6.31 (Ubuntu). Thanks.

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• linux grep question

  - by lepricon123

  how do i find a string in files in a directory. And these file names begin with letter a. I also want to get the number of occurrences of this string fromt he grep I run. I tried this cat * | grep -c string but it searches all files. I just want to search files that begin with letter a Thanks

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• Linux flash player settings dialog unclickable

  - by bullettime

  I'm using Slackware 13. When a flash app pops up the allow/deny dialog, I'm stuck because the buttons are unclickable. My adobe flash player version is 10,0,42,34. How can I fix this problem? Edit: I'm using fluxbox. I'm using an acer notebook with a synaptics touchpad... both the touchpad and the mouse can't interact with the dialog.

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• What Linux fits on a floppy disk?

  - by Peter Mortensen

  Which Linux'es fit on a 1.44 MB bootable floppy disk? Where can the .img image files be downloaded?

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• How to record screencast on Linux with mouse clicks and key hits shown

  - by zalun

  Basically I'm looking for an application. I know it's slightly off topic, but I'm looking for it to record a series of tutorials for a program I wrote. It's important to show the actions like mouse click, mouse right click, and all what's coming out from the keyboard. In the similar way to this video http://www.flickr.com/photos/jannis/3246408003/ which is made using OSX and ScreenFlick http://www.araelium.com/screenflick/ Is there such an option? Thanks

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• Command line tool for listing ID3 tags under Linux

  - by petersohn

  I want to write a script that manipulates ID3 tags of mp3 files. I need a tool that reads the tags and outputs it in a format in a machine-readable format. For example, if I want it to output only the title, then it outputs the title, nothing else. I tried different tools like id3 or eyeD3, but they can only be used to write tags or to output them in a human-readable format. Of course I could just filter that output through sed, but it seems unnecessarily complicated to me.

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• Dealing with different usernames when mounting removable media in Linux

  - by dimatura

  I have a laptop in which my username is, say, "foo". I have an external drive, formatted with Ext4, for which all files are owned by "foo" (at a filesystem level). Now, I have a desktop in which my username is, say, "bar". If I mount this external drive in this computer the files are considered to not be owned by "bar". This makes sense, but it is annoying because their bits mode are set so that only the owner can modify/delete them. What's the cleanest way to deal with this? Create a group with "foo" and "bar" and add group modification permissions?

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• Where is autorun in Linux(Ubuntu)?

  - by pukipuki

  I have the machine with Ubuntu desktop 7.something ... I want some server-like behavior without my participation. For example I have Azureus torrent-client there and I want it to start with the system like a service. Is it possible or I need another torrent-client?

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• Installing MySQL-Ruby on Linux and Ruby 1.9.2

  - by Klam

  I am having an absurdly difficult time getting MySQL-Ruby to install on RedHat 4 using Ruby 1.9.2. I am behind a company proxy that prevents pretty much any package tool from connecting to external repositories so "gem install mysql" isn't going to cut it. I have tried installing the mysql-ruby gem locally but it fails with a mysterious: $gem install mysql-2.8.1.gem Building native extensions. This could take a while... ERROR: Error installing mysql-2.8.1.gem: ERROR: Failed to build gem native extension. /ns/local/apps/internal/SWS/MetricsPublisher/ruby/bin/ruby extconf.rb checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. I have also tried building the module myself by following the included readme. The results: $ruby extconf.rb --with-mysql-include=/path_to_my_sql_headers/mysql/include/ --with-mysql-lib=/path_to_my_sql_lib/mysql/lib/ checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Does anybody have any ideas? Quite frankly, I don't even care if MySQL-Ruby specifically works, I just want ANY means of connecting to a MySQL DB through a ruby call in ruby 1.9. Thanks.

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• Linux file structure

  - by morpheous

  ok. I asked this question earlier(as part of another question) and got no response - so here it is again: what i the recommened directory for me to store the following: 1). my apps 2). development tools (C++ tools) 3). AMP applications for LAMP stack (Apache, MySQL, PHP) 4). files for websites that I develop on my machine - e.g. website1, website2 etc ...

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• How to block access to websites on a linux box [closed]

  - by user364952

  I'm just curious how many ways people can come up with to block access to a website. I simply intended to block (my own) access to news.ycombinator.com to stop my productivity drain. The first two methods I thought of were editing the hosts file to resolve news.ycombinator.com to 0.0.0.0 or adding a rule to iptables. iptables -A OUTPUT -d news.ycombinator.com -j REJECT Disclaimer: I do realise that the above two methods are easily by-passable. Doesn't help this is my own machine. What other ways does the internet know?

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• Linux Kernel IRQ Routing with irqbalance / kernel options

  - by tim

  I'm trying to get my Xen Dom0 distributing the irqs in an smp enviroment. As far as I know there are 2 Options: Use irqbalance Configure the kernel without cpu hotplug support My System is Debian Squeeze, Xen 4.0.4, Kernel 3.2.31. My Problem is: irqbalance segfaults due to a changed /proc/irq* layout or irq0 missing (this seems to be a very old bug existing since Lenny) To configure a kernel without cpu hotplug support you must disable cpu powermanagement which seems to be impossible through the standard wys (make config / make menuconfig) - the option CONFIG_PM simply defaults to "Y". Any idea anyone on how to get a debian dom0 kernel with a proper irq distribution?

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• Linux DD command partition -to- partition

  - by Ben Jackson

  I just used the DD command to copy the contents of one partition over to another partition on another drive, like this: dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=noerror sda2 partition was 66GB and sdb2 was 250GB. I read that by doing this the extra space on the drive I am copying to will be wasted, is this true? I wasn't worried about loosing the extra space for the time being however, I just ran: sudo kill -USR1 (PID) to view the current status of DD and it has written over 66GB of data, will it continue to write data until it gets to 250GB? If so, is there a way to stop the process without corrupting it as waiting for it to write blank space seems like a waste of time.

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• Is /dev in linux virtual?

  - by user973917

  Today at work a client had rm -rf /dev and ended up deleting two files in /dev/shm that forced his site to no longer work. From what I learned previously /dev is not virtual, but a fellow technician had suggested to reboot the server because /dev is virtual like /proc. Sure enough I rebooted the server and the files that the client rm -rf'd were there. So, my question is; is /dev virtual? Is it the kind of virtual like /proc? Is there more documentation on this? How can I restore the /dev files without a server reboot?

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• fdisk (linux) partitioning raid0

  - by Silverrocker

  I'm trying to create partitions for a slackware instalation on my computer (beside Windows 7) just to have a nice distro running mostly for school but when I run fdisk and print the partitiontable I get the following message: Partition x does not end on cylinder boundary. (in my case x = 1, just using x to help googlers). I must say I'm using a raid card (AMCC 3ware 9500S SATA RAID Controller). Maybe this is the problem. How can I fix this without loosing any data?

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• Change hostid in Linux

  - by user10826

  Hi, in a Ubuntu 9.10 machine, is it possible to change the hostid? Thanks

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• linux centos 5.6 someone installed irc

  - by Peter

  I need some help, my server provider contacted me to tell me my server was using 200mbit/s bandwidth. Upon investigation I found processes for a user that should not be there.. I found processes as follows: 26269 511 Nov27 ./stealth 58.22.68.253 53 775 511 Oct12 ./eggdrop -m botnick.conf I know eggdrop is IRC, my question is, where can I find out where the software has been installed for these processes?

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• Force spin-down of external hard-drive on linux (raspberry pi)

  - by user258346

  I'm currently setting up a home-server using a Raspberry Pi with an external hard-disk connected via usb. However, my hard-drive will never spin down when being idle. I tried already the hints provided at raspberrypi.org ... without any success. 1.) sudo hdparm -S5 /dev/sda returns /dev/sda: setting standby to 5 (25 seconds) SG_IO: bad/missing sense data, sb[]: 70 00 04 00 00 00 00 0a 00 00 00 00 44 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2.) sudo hdparm -y /dev/sda returns /dev/sda: issuing standby command SG_IO: bad/missing sense data, sb[]: 70 00 04 00 00 00 00 0a 00 00 00 00 44 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ...and 3.) sudo sdparm --flexible --command=stop /dev/sda returns /dev/sda: HDD 1234 ... without spin-down of the drive. I use the following hardware: Inateck FDU3C-2 dual Ports USB 3.0 HDD docking station Western Digital WD10EZRX Green 1TB Is it possible, that the sent spin-down-signals are somewhere overwritten/lost/ignored?

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