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• Searching for range overlaps in Ruby hashes

  - by mbm

  Say you have the following Ruby hash, hash = {:a => [[1, 100..300], [2, 200..300]], :b => [[1, 100..300], [2, 301..400]] } and the following functions, def overlaps?(range, range2) range.include?(range2.begin) || range2.include?(range.begin) end def any_overlaps?(ranges) # This calls to_proc on the symbol object; it's syntactically equivalent to # ranges.sort_by {|r| r.begin} ranges.sort_by(&:begin).each_cons(2).any? do |r1, r2| overlaps?(r1, r2) end end and it's your desire to, for each key in hash, test whether any range overlaps with any other. In hash above, I would expect hash[:a] to make me mad and hash[:b] to not. How is this best implemented syntactically?

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• Comparing date range quarters sql server

  - by CR41G14

  I have a policies in a system PolRef Start End POL123 22/11/2012 23/12/2014 POL212 24/09/2012 23/10/2012 POL214 23/08/2012 29/09/2012 I am asking a user for a reporting date, the user enters 24/10/2012 this becomes @StartDate From this I derive what the quarter is by the month: set @currentMonth = Month(@StartDate) if @currentMonth = 1 or @currentMonth = 2 or @currentMonth = 3 begin set @startmonth = 1 set @endmonth = 3 end if @currentMonth = 4 or @currentMonth = 5 or @currentMonth = 6 begin set @startmonth = 4 set @endmonth = 6 end if @currentMonth = 7 or @currentMonth = 8 or @currentMonth = 9 begin set @startmonth = 7 set @endmonth = 9 end if @currentMonth = 10 or @currentMonth = 11 or @currentMonth = 12 begin set @startmonth = 10 set @endmonth = 12 end I then get a date range: @quarterStartDate = CAST(CAST(YEAR(@StartDate) AS varchar) + '-' + CAST(@startMonth AS varchar) + '-' + '01') AS Date) @quarterEndDate = CAST(CAST(YEAR(@EcdDate) AS varchar) + '-' + CAST(@endMonth AS varchar) + '-' + '31') AS Date) This will give me 01-10-2012 and 31-12-2012. Basically I need a script to only bring back the policies that are in this quarter. The policy doesn't have to span the entire quarter date range, just exist in the quarter date range. The results expected would be PolRef Start End POL123 22/11/2012 23/12/2014 POL212 24/09/2012 23/10/2012 Pol123 appears because it spans over the quarterly date range. Pol212 is there because it expires in that quarter date range. Pol214 does not appear because it neither spans, expires or starts in this quarter. Any help would be greatly appreciated

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• What charectar range would this represent (regular expression)?

  - by Alex

  Recently I came across a character range that was the following: [/-+] My very simple question is, is this even a valid charectar range? If so, what range of charectars would it match?

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• What character range would this represent (regular expression)?

  - by Alex

  Recently I came across a character range that was the following: [/-+] My very simple question is, is this even a valid character range? If so, what range of characters would it match?

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• Portable, battery-powered, wireless access point, ethernet adapter

  - by Jed

  I am in need of an adapter that will convert an ethernet port into a wireless access point. I have found a handful of devices, but I'm unable to find a device that is battery powered. Does a self-powered wireless access point even exist? The particular scenario that I will be using the device for is not your typical computer/PC scenario. For the curious, here's a bit of background on the problem I'm trying to solve: I make devices (controllers) that monitor water systems. Our controllers have a Webserver that serves out web pages so that users can configure the controller's settings. Typically, the user will use a cross-over cable to connect directly to the controller's ethernet port with their laptop to gain access to the controller's web pages. Now that tablets (devices that don't have an ethernet port - iPad, for example) are becoming more common, I need to find a device that will convert the controller's ethernet port into a wireless access point so that the user can connect to the controller's web pages via Wi-Fi or Bluetooth. It's worth noting that this wireless device that I'm looking for will NOT be permanently installed on the controller. It will be a portable device that the user will use on any of his controllers when he needs to make a connection to the controller. If you know of a device that will solve the scenario that I mention above, please share your info.

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• Dell Vostro 3560 bluetooth doesn't work

  - by Shein

  I installed the wireless driver using this instruction How do I install BCM43142 wireless drivers for Dell Vostro 3460/3560 and I have WiFi working. No problems here. But unfortunately the bluetooth doesn't work. The ubuntu bar shows the bluetooth sign and I can turn the bluetooth on/off but I can't discover any devices. And I can't find my laptop when I turn visibility On. So, obviously bluetooth doesn't work. I couldn't find the reports that blutooth can actually work with this adapter in Ubuntu. So, my question is: Is there anyone with BCM43142 adapter that have bluetooth working? Thank You in advance. PS. Ubuntu 12.10 x64 Update: After some fiddling around with different drivers from different sources I managed to get bluetooth working. Not flawlessly but at least I can pair a device. Bluetooth started working after installation of this package bt-bcm43142-onereic_0.0+20111116somerville2_amd64.deb Originally I found this package on the disk with Ubuntu which came with the Laptop. What this package does, it installs a firmware loader and a firmware itself. This firmware needs to get bluetooth working. Still bluetooth sometimes doesn't work even with this package. But manual loading the firmware helps. brcm_patchram_plus_usb --patchram /lib/firmware/BCM43142A0_001.001.011.0028.0036.hcd hci0 Also I found it strange that this package writes all different ids into /sys/bus/usb/drivers/btusb/new_id because only one from the list matches my device ID bcm43142.conf: install btusb /sbin/modprobe --ignore-install btusb && echo '0a5c 21d3' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21d7' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21e1' > /sys/bus/usb/drivers/btusb/new_id && echo '0a5c 21e3' > /sys/bus/usb/drivers/btusb/new_id && hciconfig hci0 up && /usr/bin/brcm_patchram_plus_usb --patchram /lib/firmware/BCM43142A0_001.001.011.0028.0036.hcd hci0 & My lsusb: ... Bus 002 Device 003: ID 0a5c:21d7 Broadcom Corp. In conclusion: bluetooth works not nearly as good as in windows :( once I even got a complete crash of the system because of the btusb module. Luckily WiFi works perfectly :)

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• Internet on Ubuntu 12.04 stopped to work after installing updates from the update manager

  - by roman sukhanov

  I have wireless Internet access and it worked well on Ubuntu 12.04 LTS until today, when I installed updates from the Update Manager. After the reloading of the computer the sign of Internet disappeared and the Internet connection stopped working. I went to the Network section of the System settings and got such a message: The system network services are not compatible with this version. ping 8.8.8.8 gives the result Network is unreachable. What should I do?

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• MacBook Pro 8.2 wifi keeps disconnecting, Ubuntu 12.04

  - by Sean Isley

  I am using a MacBook Pro 8.2 with Ubuntu 12.04, and my wifi disconnects consistently. I followed the directions as detailed here here, however, and it works up to expected speeds, but after within an hours time, the wifi disconnects and the only way to solve the issue is to either reboot OR disable wireless and re-enable it. lsmod | grep cfg80211 outputs: cfg80211 178818 2 b43,mac80211 I suspect that I did not blacklist the correct driver and there are two drivers causing instability, however I have no idea if I actually did it correctly.

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• ath9k driver does not weak up

  - by shantanu

  I know this is common question but i found no suitable answer, so i am asking this again. I installed ubuntu 11.10. I found the bug for ath9k, so set first network boot from BIOS menu. That's worked. I have upgraded to 12.04 yesterday. Now ath9k is creating problem again. First network boot is still enable. ath9k works at start. But failed(connect again and again) after couple of minutes. dmesg show error that it can not weak up in 500us. So i tried #compat-wireless-3.5.1-1. But result is same. I have also added #nohwcrypt=1 option in /etc/modeprob.d/ath9k.conf. Still no luck. I tried #rmmod and then modprobe sudo modprobe ath9k nohwcrypt=1 dmesg shows me error: [ 400.690086] ath9k: Driver unloaded [ 406.214329] ath9k 0000:06:00.0: enabling device (0000 -> 0002) [ 406.214348] ath9k 0000:06:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17 [ 406.214368] ath9k 0000:06:00.0: setting latency timer to 64 [ 406.428517] ath9k 0000:06:00.0: Failed to initialize device [ 406.428852] ath9k 0000:06:00.0: PCI INT A disabled [ 406.428887] ath9k: probe of 0000:06:00.0 failed with error -5 dmesg error when driver fail: 355.023521] ath: Chip reset failed [ 355.023524] ath: Unable to reset channel, reset status -22 [ 355.023556] ath: Unable to set channel [ 355.088569] ath: Failed to stop TX DMA, queues=0x10f! [ 355.122708] ath: DMA failed to stop in 10 ms AR_CR=0xffffffff AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff [ 355.122714] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up [ 355.263962] ath: Chip reset failed [ 355.263966] ath: Unable to reset channel (2437 MHz), reset status -22 [ 358.996063] ath: Failed to wakeup in 500us [ 364.004182] ath: Failed to wakeup in 500us I can not install fresh ubuntu because i have lots of application installed. System : Acer Aspire 4250 AMD dual core 1.6GHZ Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01) EDITED Now i am in serious problem. No wifi device is not showing in ifconfig or lshw commands. Only ether-net interface shows. I tried (FN + WIFI) several times to enable the device but nothing helps. Now I have installed fresh ubuntu 12.04. Please help lshw -c network: *-network description: Ethernet interface product: 82566DC Gigabit Network Connection vendor: Intel Corporation physical id: 19 bus info: pci@0000:00:19.0 logical name: eth0 version: 02 serial: 00:19:d1:7a:8e:f9 size: 100Mbit/s capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.0.0-k duplex=full firmware=1.1-0 ip=192.168.1.114 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:45 memory:90300000-9031ffff memory:90324000-90324fff ioport:20c0(size=32) rfkill command does not show anything but no error.

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• Broadcom BCM4331 not working on new Mac Mini 5,1

  - by Jon

  I can't seem to get my wireless card working on my Mac Mini 5,1. Lspci returns: 03:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02) But running "additional drivers" doesn't detect anything. The nm-applet menu reads "device not ready--firmware missing." What can I do to get this to work? Note, this is with 12.04.1, so many of the previous discussions (for 11.10, etc) probably don't apply here.

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• Cannot connect to the Internet

  - by Pratap

  My desktop has Broadband wired connection - shows connected, but unable to load any web page in Ubuntu 12.04 but works fine with Windows 7. My laptop - wireless connection shows connected, but again does not load any web page. Please help. On running sudo dhclient eth1 on my laptop there is no result - see the screen output:prajna@LAPTOP:~$ sudo dhclient eth1 [sudo] password for prajna: prajna@LAPTOP:~$ sudo dhclient eth1 [sudo] password for prajna: after giving password - some time later the screen comes back to prajna@LAPTOP:~$

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• How to get D-Link DWA-547 working on Ubuntu 13.10?

  - by Tan Kah Ping

  I got a D-Link DWA-547 Wifi card which is supposed to work out-of-the-box with Linux. Says so here: http://wireless.kernel.org/en/users/Drivers/ath9k/products/external While lspci does list the device, NetworkManager doesn't seem to allow me to configure Wifi. lsmod also shows that ath9k isn't loaded. Manually loading with 'modprobe ath9k' doesn't help. How do I get this card working on Ubuntu 13.10 64-bit?

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• Packard Bell TK11 Wifi not working (Ubuntu 12.10)

  - by Ingmar

  Hardware: Packard Bell EasyNote TK11BZ, BIOS version 1.15 Broadcom BCM43227 802.11 b/n/g Problem: Everything works as it should, except the wireless connection. The Wifi device is enabled in the "Additional Drivers" section of Software Sources, but does not even show up in the network manager drop-down. sudo lshw -C network: *-network UNCLAIMED description: Network controller product: BCM43227 802.11b/g/n vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:07:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:f0100000-f0103fff

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• hotspot in ubuntu 12.10 using hostapd unable to connect other devices

  - by MuffinStateWide

  I've created a hotspot using hostapd ad I cant connect any other device to it.all i get are a mixture of 3 errors unable to connect to kernel driver unable to set beacon parameters (which are set in my config file) or I get stuck at the authentication stage and it times out I'm using a TP-Link wireless N PCI card WN-951N (which does not support master mode) and the version provided by ubuntu in the repos. ps. this setup worked flawlessly in 12.04 LTS Any extra information, just let me know and i'll get it to you ASAP

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• Ubuntu 13.10 - Wifi not re-connecting after suspend

  - by Matthew

  I upgraded the other day from Ubuntu 13.04 to 13.10 on my ZaReason laptop, and the WiFi doesn't reconnect after suspend. In 13.04, pressing Fn+F2 turned network connections back on after suspend. The 'soft' wireless hardware switch. But in 13.10, that doesn't work, and trying to enable networking in the networking menu doesn't work either. So I have to restart every time. Any suggestions to make it work?

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• WIfi Problems Ubuntu 13.10

  - by user289429

  i've been searching the forums for two days now but none of the answers seems to work for me. I have an acer extensa 5630 which has an Intel WIfi 5100. But even when i am right next to my router i cannot detect the wireless network. The weird thing is, that when i create a hotspot from my mobile phone it automatically detects it and connects to it.I think i do have the correct drivers installed. Thanks

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• Is there a way to get my NETGEAR N900 to work with ubuntu?

  - by user208088

  I'm using a NETGEAR N900 USB Wireless Adapter to pick up our home network connection while running Windows 7. I have Ubuntu 12.04.3 running on a second hard drive in my computer that is not compatible with my adapter. I'm not very familiar with how to work around in Ubuntu yet and this is the only thing keeping me from using it. I've seen this asked before but the instructions were very confusing to me! Help is appreciated

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• WiFi on Ubuntu 12.04 custom: downloading unbearably slow

  - by Mark

  iwconfig reports 11 Mbps, yet I've seen as low as <1 KBps. This is the latest in my laundry list of Ubuntu problems in a dual-boot machine (cyberpowerpc custom, intel i7-3820, nvidia gtx 570). I received it two days ago, Windows 7 running fine, still having problems with Ubuntu. The browsing is intermittent but unacceptable. e.g. I could get to this site last night but I couldn't post this question. The downloading is unbearably slow, I can't download anything or install any packages because the speed is so slow. e.g. I am trying to install vim which is inexplicably missing from my 12.04 install (add another one to the problems list) and my download speed reported in the terminal was 241 B/s. Yes, bytes. iwconfig reports 11 Mbps, which further adds to the confusion. User@ubuntu:~$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"linksys" Mode:Managed Frequency:2.437 GHz Access Point: 00:18:39:76:2C:A1 Bit Rate=11 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=36/70 Signal level=-74 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:54 Invalid misc:18 Missed beacon:0 eth0 no wireless extensions. Any ideas? I see this is a problem a lot of people, but none of the on line solutions have worked for me so far. e.g. one site recommends editing the ath9k.conf file in /etc/modprobe.d, yet this file isn't even in the folder: User@ubuntu:/$ cd etc/modprobe.d User@ubuntu:/etc/modprobe.d$ ls alsa-base.conf blacklist-oss.conf blacklist-ath_pci.conf blacklist-rare-network.conf blacklist.conf blacklist-watchdog.conf blacklist-firewire.conf dkms.conf blacklist-framebuffer.conf nvidia-current_hybrid.conf blacklist-modem.conf nvidia-graphics-drivers.conf I think the nvidia gpu might be mucking things up. I had the "blinking cursor" problem when installing in the first place, and then I had the monitor out of range problem as well. I have my faithful Asus laptop, which is running Ubuntu 12.04 just fine. The only difference is executing host -t SOA local in the terminal gives User@ubuntu:~$ host -t SOA local local has SOA record local. nobody.localhost. 42 86400 43200 604800 10800 in my new machine, and the command reports Host local. not found in the laptop. Help would be most welcome, as I am in danger of reverting back to Windows. I'm seriously considering it. Sorry for the length, trying to show my effort in resolving the issue and include terminal snippets that might be helpful.

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• why there is a lot change in the hardware support features in different linux os?

  - by TrazerWalker

  i am using lenovo b460 with 3 GB ram and 500 GB hard disk,(no graphics card). when i live boot Linux mint i was able to connect to WiFi.but when i booted up Ubuntu 11.4 i was not able to connect through WiFi.then later i installed Ubuntu 12.4 and then i got connected with WiFi, but after installing icons and themes through my unity i am not able to view the content in the terminal and the WiFi is also not connecting now even after i changed them all back. wireless connectivity

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• How do I install Inventel UR056g usb wifi?

  - by kuberprok

  I am am using a Inventel UR054g (R01) usb wireless adaptor on my desktop. I had quite trouble setting it up but after installing ndiswrapper and prism2 drivers I got it up and running. However, I need to run in the command line the following to get it started; sudo dhcpcd wlan0 I want this top start automatically when I restart the PC. Further, I aslo want this connection to be available to other users. Any help would be appreciated.

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• Subnet mask and how to resolve IP range [duplicate]

  - by user2789433

  This question already has an answer here: How does IPv4 Subnetting Work? 5 answers If you click on this link WHO IS query You will see the results from a who is query for a random IP address. On the line "inetnum": "122.4.0.0/14", What does it mean for the prefix to be 14? I am using this as a reference Subnet Mask Cheatsheet While resolving it, I get a very wide range which is something like 122.7.0.0-122.4.0.0 I am not able to understand how the IP range is calculate from the subnet mask and I am only able to find calculators online and not a method to solve it.

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• Use MacBook Pro airport for injection with kismac

  - by Am1rr3zA

  Hi, I want use kismac to break my WEP wireless password with my MacBook Pro but when I go to step that want to inject packets it's doesn't do anything! I some where read that MacBook Pro wireless cards don't support injection! Is that right? How can I solve this? If I must buy USB Wireless Modem which one is better ?

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• excel chart dynamic range based on values

  - by andrewk

  I'm trying to create a chart that auto updates itself from a data provided. The range of the chart is always fixed/locked. The issue I'm facing is that when a value for a certain month is 0, I want it to skip to the last non-zero month . Meaning the ranges selected forming the chart should exclude the month with the value zero. Which in most cases is the top month. The image below should clear it up. Is there a way to have the chart range be dynamic based on certain values?

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• Get IP network range after reverse DNS?

  - by Max

  For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of IPs resolve to corporations, schools, government, international etc. Despite a bunch of optimizations, individually reverse-DNS'ing every IP address still appears to be fairly expensive though. So - is there any way to obtain an entire range of IPs from a reverse-DNS? If yes, this could greatly reduce the number of actual reverse-DNS lookups. Example (numbers slightly obfuscated): Log file contains a request from an IP 128.151.162.17 Reverse DNS resolves to 11.142.152.128.in-addr.arpa 21599 IN PTR alamo.ceas.rochester.edu (So this is a visitor from Rochester University, rochester.edu) Now, would it be safe to assume that all at least all IPs from 128.151.162.* will also resolve to rochester.edu? What about 128.151.*.*? Is there a way to get the exact IP range?

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• Router's ssid changes from infrastructure to ad-hoc

  - by waldo

  For a period of time the router's ssid is shown (on various computers) as a normal infrastructure network - computers connect fine and everything works however after a few minutes / hours all computers see the same ssid as an ad-hoc network (not infrastructure). At this point a computer that was already connected continues to work - a computer that isn't cannot connect. Rebooting the router temporarily restores the visibility of the correct infrastructure ssid. Is something interfering? Connecting computers: macbook (2009), iphone 3g, windows vista desktop, windows xp desktop. Details: - D-Link DSL-2740B router set to WPA2-PSK (Personal) - Enable Wireless : Yes - Wireless Network Name (SSID) : ###### - Country : Australia - Wireless Channel : 1 - 802.11 Mode : Mixed 802.11n, 802.11g and 802.11b - Channel Width : Auto 20/40 MHz - Transmission Rate : Best (automatic) - Hide Wireless Network : No - Group Key Update Interval : 0 (seconds)

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