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• How does file compression work?

  - by Phoshi

  So, I realised today I take file compression for granted. The ability to bundle a few files together into one, and have it come out smaller than any of them, is something I just accept as a fact, but how does it actually work? I have a limited knowledge of it that includes something to do with replacing all the duplicate entries with pointers, to shrink that way, but beyond that I'm fairly clueless! As I'm always open to new knowledge, as I imagine most of us here are, I thought I'd ask. So, SuperUser, how does compression actually work?

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• Is there Linux Live USB that works with Snow Leopard macbook pro from 2010 april

  - by rofrol

  Hello, I was searching for a long time a Linux Live USB that I can boot my macbook pro from. Is there such distro so I can install it on Snow Leopard or Windows 7? UPDATE I've found this: "isohybrid" CD images (..) are special in that as well as the normal CD-based ISO9660 filesystem they also contain a valid-looking DOS-style partition table. Thus, if you simply copy one of these images raw to a USB stick a normal PC BIOS will boot the image directly. (...) Finally: I'd like to add support into xorriso for creating the nasty HFS hybrid images that are needed for booting Macs. The code that does this in cdrkit is probably some of the worst that I've ever worked with, and I'd like to get away from it. If only Apple hadn't stupidly built their proprietary platform around this shit and had used open standards instead Source

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• PHP session files have permissions of 000 - They're ununsable

  - by vanced

  I kept having issues with a Document Management System I'm trying to install as, at the first step of the installation process, it would error with: Warning: Unknown: open(/tmp/sess_d39cac7f80834b2ee069d0c867ac169c, O_RDWR) failed: Permission denied (13) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 I looked in /tmp and saw the sess_* files have the following permissions ---------- 1 vanced vanced 1240 Jan 20 08:48 sess_d39cac7f80834b2ee069d0c867ac169c All the session files look like this. So obviously, they're unusable by PHP and it's causing me lots of problems. How can I get PHP to set the correct permissions? I've tried changing the directory which php.ini uses to /tmp/phpsessions and the same thing occurs. The directories are a+rwx.

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• Custom CSV (.csv) filter for OpenOffice.org or LibreOffice?

  - by anon

  Is it possible to create a some kind of 'custom CSV filter' for OpenOffice.org or LibreOffice spreadsheet program. What I need is to have the program to use predefined CSV settings for loading and saving when I open, let's say file named 'somefile.myext'. Also I would need the loaded data to be placed in a prestyled spreadsheet. In this particular case, I would need the CSV settings to have tab as a field delimiter and no text delimiter at all. Prestyled spreadsheet would contain Blue gray coloring for every odd row (achieved with conditional formatting formula), some font styling and probably some column width definitions.

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• Outlook 2010 stopped marking messages as read after reading them

  - by dunxd

  Yesterday I noticed that Outlook 2010 had stopped marking messages as read unless I right click and select Mark as Read. I have checked the Reading Panel settings (it's set to 0 seconds), but I don't use the reading panel to read my mail. When I open a message by doubleclicking it, then close it again, the message is still marked as Read. Outlook 2010 is connecting to Exchange Server 2003. This was working fine until yesterday. As far as I know there have been no config changes at either the client or server end.

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• Does programmable hardware exist to allow hardware to be programmed by computers?

  - by agentbanks217

  I am a programmer and I have never really dealt with the hardware of anything, only software. I want to start building things that I can control from my computer using programming. My question is are there such devices on the market that have a programmable interface or API? For example, I want to build a automated window blinds opening/closing device, and I would like to be able to control it from my computer e.g. writing an app or some code to schedule them when to open and close. I would like to know if there are any devices that can be programmed to do that (the computer part)? Thanks!

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• Is a memory upgrade a viable option to fix performance issues? [closed]

  - by ratchet freak

  I'm currently seeing my PC getting bogged down by Firefox 11.0 alone with only one hundred tabs open. Resulting in a memory use of over 530M , VM size of over 800M and an insane amount of page faults (easily reaching 100 million over the course of the day). The PF delta during normal operation easily reaches 7k with peaks to 15k sometimes reaching over 20k. This leads to a (real) deterioration to response time when switching, opening and closing tabs, opening menus, typing, ... My question is: Am I right in assuming that plugging in more RAM (either adding 2x1GB or replacing the existing RAM with 2x2GB or 4x1GB) will solve this problem? My specs: Windows XP Home Edition SP3 (32 bit) Intel Core Duo 2,4 GHz 2x512MB RAM 800MHz DDR2 (dual channel) 4MB unified cache 320GB HDD Intel G33 (X3100) onboard graphics (no graphics card but PCI express x16 slot is available)

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• Office 2007 Mail Merge: How do I view field names instead of data?

  - by One Monkey

  I've just received a document which forms the basis of a mail merge as an attachment and I need to view the field names like they display in 2003 with the double chevrons e.g. <<titles>><<initials>><<surname>> However even though I get a dialogue as I open the docx file saying that it is going to attempt to merge from a file (which I don't have) and I cancel that operation the document still displays merge data e.g. Mr A Test Instead of the field names. I have clicked on the fields which turn grey to demonstrate that they are fields but I can't find a way to make it display the field names not the data. I don't even know where it's getting the data from as I don't have the data source file for the document to use.

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• Disabled annotation tools in Skim

  - by Kit

  Here's a portion of the toolbar in Skim In the Add Note section, why are the following tools disabled (dimmed)? Add New Highlight (A in the yellow box) Add New Underline (red line under A) Add New Strike Out (A struck out by red line) However, in the Tool Mode section, there is a drop down button (shown as active in the screenshot). To illustrate, I can select and use the Add New Underline tool, as well as the other tools I mentioned above, using the drop down button. But those tools are dimmed out in the Add Note section. Why? I have observed that the drop down button is just a duplicate of the Add Note section. Why not just enable all the buttons in the Add Note section and save the user from making an extra click just to bring down a list of tools? Is this because of some property of the presently open PDF, or what?

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• Cannot Login as root

  - by Josh Moore

  At my work we ship our product on pre-installed servers as a software/hardware package. We are using open SUSE 10.3 for the OS and we setup and we always log in with the root user to do maintenance on the box. Recently we just had box returned to us that the customer said the could not longer connect to the box through the network interface. So when I started to work on the box I run into the this problem: At the command prompt to login i type the user name "root" and hit enter. Then even before it asks me for a password I get "Login incorrect". I have never seen this behavior before and could not find any information about it online. Does anybody know what is going on? Thanks.

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• Windows 7 disappearing applications and shortcuts

  - by kurkevan

  I installed a number of applications on a new laptop running Windows 7, selecting "run as administrator" wherever necessary. But after rebooting, all executable files (.exe, .bat) were missing from the program folders, and all the new desktop shortcuts were gone as well, without a trace! I can't even open any pdf's now, because the reader application I installed seemingly no longer exists. My hunch is that this has something to do with UAC virtualization, but I don't really understand how, since I was logged on as an administrator the whole time. Any help would be greatly appreciated!

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• How to Track CPU and Memory Usage Per Process

  - by Mjsk

  I have seen this question asked on here before but was unable to follow the answer which was given. I would like to monitor a processes CPU, Memory, and possibly GPU usage over a given time. The data would be useful if presented in a graph. It would be nice if I could do this using Performance Monitor, but I am open to alternative solutions as well. I have tried using Performance Monitor and my problem is that I'm not sure which performance counters to use since there are so many. I've been looking at a Process, Processor, Memory, etc. but I'm not sure which counters within those categories will be of interest to me. My OS is Windows 7.

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• RDC not working from outside

  - by Cotten

  I've set up Remote Connection according to : http://windows.microsoft.com/is-IS/windows7/allow-remote-desktop-connections-from-outside-your-home-network That is, Allow remote connections to the computer you want to access. Make sure Remote Desktop is able to communicate through your firewall. Find the IP address of the computer on your home network that you want to connect to. Open your router's configuration screen and forward TCP port 3389 to the destination computer's IP address. Find your router's public IP address so that Remote Desktop can find it on the Internet. When I'm inside the LAN, RDC works flawlessly. When I try to connect to the ip given by my ISP it cannot connect. I've setup port forwarding for 3389 on my netgear router. Thanks!

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• With Bash + iTerm2, how to name tabs?

  - by Problemaniac

  In iTerm2 (Build 1.0.0.20120203), I typically open several tabs, each of which has split panes , and is about one particular theme of work, for example revision control, coding, managing files, mysql terminal work. I typically need to switch between 5 or more tabs in my work flow. It is sometimes hard to remember or tell which is which by looking at the content of the screen. I'd like to name the tabs somehow, so I can quickly tell which is which by quickly glancing. Is this possible?

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• Sql database dumps failing every night

  - by chaseman36

  Hey guys, I have sql05 and my maintenance plan which backs up a database to an external storage SAN, has been failing every night. Here is my error: Executing the query "BACKUP DATABASE [master] TO DISK = N'\\192.168.x.x\vmbackup\server\dbbackup\master_backup_201004222300.bak' WITH NOFORMAT, NOINIT, NAME = N'master_backup_20100422230002', SKIP, REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "Cannot open backup device '\\192.168.x.x\vmbackup\server\dbbackup\master_backup_201004222300.bak'. Operating system error 5(Access is denied.). BACKUP DATABASE is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. I googled this error and tried adding permissions to the backup device for network service as recommended at experts exchange, no dice. Does anyone have any ideas?

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• Source File not updating Destination Files in Excel

  - by user127105

  I have one source file that holds all my input costs. I then have 30 to 40 destination files (costing sheets) that use links to data in this source file for their various formulae. I was sure when I started this system that any changes I made to the source file, including the insertion of new rows and columns was updated automatically by the destination files, such that the formula always pulled the correct input costs. Now all of a sudden if my destination files are closed and I change the structure of the source file by adding rows - the destination files go haywire? They pick up changes to their linked cells, but don't pick up changes to the source sheet that have shifted their relative positions in the sheet. Do I really need to open all 40 destination files at the same time I alter the source file structure? Further info: all the destination files are protected, and I am working on DropBox.

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• Can a DNS server return NXDOMAIN and an unresolved CNAME even though the alias exists?

  - by Martin

  I'm trying to understand why one given DNS server is not resolving our domain correctly. When I look up www.foo.com from this name server, a CNAME foo.bar.cc is correctly returned but there's no attached A record and the response status is NXDOMAIN. I understand that this could happen if the DNS server can not resolve the alias foo.bar.cc. However, if I use the same DNS server and look up foo.bar.cc directly, I always get the correct A record. When using any other DNS servers I've tested (different ISPs, Google DNS, Open DNS) our domain resolves correctly. Given this situation, is there some possible problem in our DNS that could cause this? Or does it seem like this given DNS server is to blame? The DNS server in question is used by a lot of people and it seems more likely that the problem is caused by us, but I don't see how - any clues?

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• Bringing Google Docs to the Desktop

  - by Jonathan Sampson

  Is there a stable way of accessing Google Docs (application) from my desktop without having to use a browser on Windows? On my accepted answer... While I did stipulate that I wanted to not use my browser, I didn't really mean I wanted to avoid browser technology. I meant I didn't want to open my browser, type in the web address for google docs, etc. TheTXI's answer required me to download/install nothing more than what I already had (Chrome) to acheive this. It created a desktop icon (similar to an application) that launches me right into my docs (similar to an application), without extra browser-items on the screen. This was an excellent suggestion, and won by virtue of parsimony.

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• Windows Server 2008 freezes when I run programs as administrator

  - by user5795

  I am working on a machine running Windows Server 2008. Every program I have tried to run (firefox, notepad, wordpad) works fine, but if I right-click on any item on the desktop or the start menu and select "Run as Administrator" it freezes. I can move the mouse around and open/close the start menu, but the items in the start menu do not change color when the mouse hovers over them. I googled for answers for some time but had no luck. Does anyone have any ideas that I could try? (Update: I forgot to mention that the machine is virtual and I am using VMWare Workstation. In order to answer the questions below, I have been going to the same snapshot of the system each time. This lets me start the system in the exact same place each time in order to answer your questions and test.) (Update: When I run any process as administrator and it freezes, I can start task manager, but I cannot see the new process (notepad, etc...) )

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• Encrypted TrueCrypt volume in file with decoy content?

  - by penyuan

  I've been reading about the encryption features of TrueCrypt, including the feature to have an encrypted volume inside a file with any name. For example, I can create an encrypted volume inside a file named music.mp3. However, the file won't really play when I try to open it in a music player. Is there a way to add "decoy" content to music.mp3 so that someone who doesn't know its got encrypted content can double click on it and music will play? Obviously it doesn't have to be music, but also images, decoy test document, etc. etc.

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• apache dont send me mp3 header even when use direct address to the file

  - by user1728307

  apache dont send me mp3 header even when use direct address to the file, it means i can play it with flash audio players on my web pages, but when i tried to download from direct address on my server i got "Error 101 (net::ERR_CONNECTION_RESET): The connection was reset" or sometimes gives me a file with mp3 extension that has just 13B files-size, and when i open that file in gedit/notepad there is just: <html></html> i dont have any problem with php files and images, but mp3 files never be send to browser for download or play. i added this code to httpd.conf: AddType audio/mpeg .mp3 but there is not any difference!! thanks in advance

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• Someone used my postfix smtp (port 25) to send spam mails to me

  - by Andreas

  This week, someone started to send spam-mails through my postfix-smtp access (I verified by logging in through telnet from an arbitrary pc and sending mails with any ids myself) on my server, with recipient and target being [email protected]. Since I have a catchall and mail-fowarding to my google account, I received all those (many) mails. After a lot of configuration (I lost track of what change did what, going through dozends of topics here and over the net) that hole seems fixed. Still, what hapened? Does port 25 need to be open and accepting for my catchall to work? What configuration did I do wrong? I remember the first thing I changed (that had an effect) was the inet_interface setting in main.cf, only later to find out that if this does not say "all", my mail to mydomain.com does not get forwarded any more.

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• ESXI 4.0 Slow response in opening anything accross the network on a Virtual Server running Win2008

  - by user40944

  Hi I recently installed a HP ML350G6 Server with Windows Small Business Server 200864bit, Exchange 2007. The server was running fantastically and we transferred all user data onto the new server and no problems for 2 weeks! We then installed SQL2008 and transferred the accounts package onto the server and this is where the problems started. Users are now complaining to open a work document can take 2 minutes and the same with regard to anything else. The server itself seems fine, the virtual server seems fine! No disk performance problems (doesn't go above 50% unless i really copy lots of things), no memory, (12Gb only using 7Gb) cpu (usage is low average about 15%) etc on both the VM and in Windows Task manager. I have made sure disk caching is enabled on the raid controller (which made no difference). Network cards are running 1Gb and plugged into HP GB switch. Please help!

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• Creating bootable Fedora USB with persistent storage

  - by dooffas

  I am attempting to burn the full Fedora 19 x86_64 DVD iso to a USB drive and have a separate partition on it for a kickstart file / other media that will be installed in the kickstart process. With the Ubuntu server 12 iso, you can simply dd the iso to the usb drive: dd if=/path/to/iso of=/dev/sdb Once the iso has been burnt, open gparted and create a ext2 parition in the allocated space. However, this does not seem to work with the Fedora ISO. When loading the USB drive in gparted I get a warning and an error: Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Error: The partition's data region doesn't occupy the entire partition. Ignoring both of these errors allows gparted to load the usb drive, however it shows a blank drive with no partition table. Has anyone come across this before? From what I have found, it may have something to do with the fact that Fedora use isohybrid.

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• SSL Certificate only works when session active in Server 2008

  - by CodeMonkey1

  I have a web app that uses an installed certificate to send a web request to a 3rd party web service. This has worked for a long time on Windows Server 2003, but just recently we found a problem with it on 2008 installations. When logged into the server as the same user the App Pool uses, either locally or via remote desktop, the web app and it's secure 3rd party request works fine. However, when there are no user sessions open, the 3rd party request fails, as if the certificate were not attached to the web request. Any ideas?

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