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• What type of command can I use for shortcut assignment?

  - by navie

  We all know that Ubuntu 12 has a shortcut mapper under "Keyboard" utility. I wonder when it asks for "command" in the new shortcut dialog, what type of command can I use? I used to think that commands in terminal can also be used here, but it seems xdotool is not like that. btw, if xdotool is not the right solution, how to map a key combination to a another key? for e.g.: alt+j to Down arrow key Thank you

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• How do I prevent the Sleep button from locking the screen

  - by elmicha

  My keyboard has a Sleep button. I defined a shortcut in System Settings, Keyboard Shortcuts own settings (or similar), so that the Sleep buttons runs a script. That works. But since my upgrade to Oneiric, something also locks the screen (in the same way the screen is locked when I press Ctrl+Alt+L). Can I disable that behaviour? What's the name of that lock screen? I tried hiding gnome-screensaver and /etc/acpi/ and I looked in gconf-editor /apps/gnome-power-manager/buttons. I didn't find anything related in dconf-editor.

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• Binding hotkey for toggling wireless card state - System76 Bonp3

  - by user109076

  Recently, my wireless card shut off on my laptop (System76 Bonp3 running Ubuntu 12.04 LTS). Awhile back, my keyboard had a meeting with a cup of coffee, and my F11 key no longer works. The key binding for turning my card back on happens to be Fn + F11, so I cannot turn my wifi on. The only solution I can think of is to somehow change this to be bound to another key. I'm looking for the script that handles this particular hardware switch so I can bind it elsewhere.

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• Custom keyboard shortcuts are reset. How can I make them set permanently?

  - by Awi

  I'm having a problem with both Ubuntu 12.04 and 12.10 with custom keyboard shorcuts. They are reset after a while (I can't find a pattern but it seems to be when a massive upgrade happens). It happend to me a couple of days ago, when 12.10 got about 27 updates. I've searched launchapd and askubuntu, and found no question similar. My shortucts are not lost on reboot, I still can't find a pattern to identify the problem as I said. I tried also not using Control Center app, but gnome's dconf-editor, but same result as I found on some blog post. My question is, how can I save my custom shorcuts to restore them when this happens? Can somebody help me compose a bug for launchpad, like what package could be causing this, so I can fill a bug report. Thanks in advance.

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• Is is OK to use a non-primary key as the id in a rails resource?

  - by nPn

  I am getting ready to set up a resource for some new api calls to my rails application. I am planning on calling the resource devices ie resources :devices This is going to represent a android mobile devices I know this will get me routes such as GET devices/:id In most cases :id would be an integer representing the primary key, and in the controller we would use :id as such: GET devices/1 @device = Device.find(params[:id]) In this case I would like to use :id as the google_cloud_messaging_reg_id So I would like to have requests like this: GET devices/some_long_gcm_id and then in the controller , just us params[:id] to look up the device by the gcm registration id. This seem more natural, since the device will know it's gcm id rather than it's rails integer id. Are there any reasons I should avoid doing this?

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• Disable keyboard suspend key

  - by Jcubed

  How do I disable my keyboard's suspend key? My keyboard (Logitech k800) has a key for powering off the pc, in Ubuntu its working as a suspend button. I've tried assigning another shortcut to that button, but its not preventing the computer from sleeping. Also, I'm not sure if there's a difference between suspend and sleep, but it appears to be turning the computer completely off, but when I start it back up it resumes where it left off.

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• How can I paste text by pressing the left and right mouse buttons at the same time?

  - by Badministrator

  I am coming from Ubuntu 10. I just recently upgraded to 12.04 LTS. In 10, I use to be able to cut and paste from Terminal by selecting text, and just pressing my two mouse buttons. In 12.04, I can't seem to do this. I have to highlight text, then right click to copy, then right click to paste. Or, I can do ctrl-shift-c and ctrl-shift-v. Both are okay methods, but not as fast as before. How do I configure Ubuntu to preserve 'old-school' cut and paste?

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• How can I change the percent of screen brightness that changes every time I press the shortcut?

  - by Chriskin

  When I press Fn+F6 the change in brightness is too big. How can I make it move less than it does now? (Let's say, half that, for example.) (11.04/Gnome. I'm on proprietary nvidia drivers.) EDIT: I haven't tried what Rinzwind has written below because , after throwing a cup of coffee on my laptop, my keyboard was destroyed (so i no longer have the FN button that is needed - i'm currently writing from an external one). I have already ordered a new one and i will collect it from the service center tomorrow at noon

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• What is the keyboard shortcut to minimise a window to launcher in unity?

  - by uzi3k

  In 10.10 that I was using before 12.04 you could use alt+F9 to minimise a window to the task bar. In 12.04 meta+ctrl+ cursor up down maximises and unmaximises a window. If you have a numeric keypad you can use ctrl+alt+0 to minimise to launcher. On my netbook I don't have a numeric keypad and the normal numbers do not work with the above shortcut. How can I minimise windows with a keyboard shortcut?

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• How to set Fn+F2 to show battery's status throug OSD and not power statistics?

  - by papukaija

  In natty pressing Fn+F2 on my Samsung NC10 opened a new notification with the remaining battery power. After upgrading to Oneiric, it opens the power statistics. Is the a way to revert this change? Checking the battery status with the notification is much faster than finding it from the power statistics. I know that the remaining battery time can be set to be shown on the panel but I'm used to Fn+F2.

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• How to disable the "roll up" / "shade" keyboard shortcut in Gnome 3 (after upgrading to 12.04)?

  - by torpesco

  I am using Gnome 3. After upgrading from 11.10 to 12.04, "Ctrl-Alt-S" was reclaimed for use in toggling the shaded state of a window. I have checked the following places, and I haven't been able to find any instance of a keybinding set for toggling the shaded state. System Settings / Hardware / Keyboard / Shortcuts (as per How do I disable Ctrl+Alt+s to minimize a window?) I even tried setting a different shortcut. Made no difference. dconf-editor (now deprecated, from what I've found) gconf-editor/gsettings What am I missing?

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• How do I focus an "urgent" application?

  - by pydave

  Sometimes applications will wiggle in the launcher and have a blue triangle. (See compiz config settings for Unity.) How can I set a keyboard command to bring that application to the front in Ubuntu 11.10? I had it set in 11.04, but I don't remember how. This is useful when programs open in the background or if you activate them from another app. (I have an alias to send files to a single gvim instance from Terminal instead of opening them in their own window. When gvim gets the file, it wiggles but doesn't gain focus.)

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• Scale effect to preview and switch between windows?

  - by ycelik

  at work ive installed ubuntu 10.10 and love using the Super+a keyboard shortcut to switch between my windows. at home i use kubuntu 12.04 and miss that feature. ive seen a video on youtube and know that it is possible but couldn't figure out how. https://help.ubuntu.com/community/KeyboardShortcuts/ Super + A | Enables the 'scale' effect, it shows all windows from all workspaces. thanks for your time

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• Building a many-to-many db schema using only an unpredictable number of foreign keys

  - by user1449855

  Good afternoon (at least around here), I have a many-to-many relationship schema that I'm having trouble building. The main problem is that I'm only working with primary and foreign keys (no varchars or enums to simplify things) and the number of many-to-many relationships is not predictable and can increase at any time. I looked around at various questions and couldn't find something that directly addressed this issue. I split the problem in half, so I now have two one-to-many schemas. One is solved but the other is giving me fits. Let's assume table FOO is a standard, boring table that has a simple primary key. It's the one in the one-to-many relationship. Table BAR can relate to multiple keys of FOO. The number of related keys is not known beforehand. An example: From a query FOO returns ids 3, 4, 5. BAR needs a unique key that relates to 3, 4, 5 (though there could be any number of ids returned) The usual join table does not work: Table FOO_BAR primary_key | foo_id | bar_id | Since FOO returns 3 unique keys and here bar_id has a one-to-one relationship with foo_id. Having two join tables does not seem to work either, as it still can't map foo_ids 3, 4, 5 to a single bar_id. Table FOO_TO_BAR primary_key | foo_id | bar_to_foo_id | Table BAR_TO_FOO primary_key | foo_to_bar_id | bar_id | What am I doing wrong? Am I making things more complicated than they are? How should I approach the problem? Thanks a lot for the help.

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• Natural vs surrogate keys on support tables

  - by Bugeo

  I have read many articles about the battle between natural versus surrogate primary keys. I agree in the use of surrogate keys to identify records of tables whose contents are created by the user. But in the case of supporting tables what should I use? For example, in a hypothetical table "orderStates". If you use a natural key would have the following data: TABLE ORDERSTATES {ID: "NEW", NAME: "New"} {ID: "MANAGEMENT" NAME: "Management"} {ID: "SHIPPED" NAME: "Shipped"} If I use a surrogate key would have the following data: TABLE ORDERSTATES {ID: 1 CODE: "NEW", NAME: "New"} {ID: 2 CODE: "MANAGEMENT" NAME: "Management"} {ID: 3 CODE: "SHIPPED" NAME: "Shipped"} Now let's take an example: a user enters a new order. In the case in which use natural keys, in the code I can write this: newOrder.StateOrderId = "NEW"; With the surrogate keys instead every time I have an additional step. stateOrderId_NEW = .... I retrieve the id corresponding to the recod code "NEW" newOrder.StateOrderId = stateOrderId_NEW; The same will happen every time I have to move the order in a new status. So, in this case, what are the reason to chose one key type vs the other one?

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• Keycodes of function keys with F-lock off?

  - by ak

  Many recent keyboard from Microsoft and Logitech have a so-called F-Lock key, which toggles the function keys F1 to F12 between their traditional keycodes and new meanings that are printed onto the keys: F1=Help F2=Undo F3=Redo F4=Open ... . (See also http://en.wikipedia.org/wiki/F-Lock.) This means that long-established shortcuts such as Alt+F4 no longer work if the F-lock is off, and googling shows that quite a few people are unhappy about this. So I'm wondering, what virtual key (VK) codes do the function keys send when F-lock is off? VK_F13 to VK_F24 perhaps? Or do they not trigger standard keyboard events at all? (I haven't got such a keyboard to try and find out myself, and didn't manage to dig up anything on MSDN about this.)

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• ActiveRecord fundamentally incompatible with composite keys?

  - by stimms

  I have been attempting to use subsonic for a project on which I'm working. All was going quite well until I encountered a link table with a composite primary key. That is a key made up of the primary keys of the two tables it joins. Subsonic failed to recognize both keys which was problematic. I was going to adjust subsonic to support compound keys but I stopped and though "Maybe there is a reason for this". Normally active record relies on a single primary key field for every record, even in link tables. But is this necessary? Should I just give up on active record for this project or continue with my modifications?

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• SQL multiple primary keys - localization

  - by Max Malmgren

  I am trying to implement some localization in my database. It looks something like this (prefixes only for clarification) tbl-Categories ID Language Name tbl-Articles ID CategoryID Now, in my tbl-Categories, I want to have primary keys spanning ID and language, so that every combination of ID and language is unique. In tbl-Articles I would like a foreign key to reference ID in categories, but not Language, since I do not want to bind an article to a certain language, only category. Of course, I cannot add a foreign key to part of the primary key. I also cannot have the primary key only on the ID of categories, since then there can only be one language. Having no primary keys disables foreign keys altogether, and that is also not a great solution. Do you have any ideas how I can solve this in an elegant fashion? Thanks.

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• MySQL: Changing order of auto-incremented primary keys?

  - by Tom

  Hi, I have a table with a auto-incremented primary key: user_id. For a currently theoretical reason, I might need to change a user_id to be something else than it was when originally created through auto-incrementation. This means there's a possibility that the keys will not be in incremental order anymore: PK: 1 2 3 952 // changed key 4 5 6 7 I'm wondering whether this will cause problems, and whether MySQL reads something special to the incremental order of the keys, given that they should have come to existence in incremental order (which persists even when some rows are deleted). Assuming there are no associated foreignkey issues, or that these are under control, is there a problem with "messing with" the order of MySQL's autoincremented keys? Thank you.

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• JDO in Google App Engine: order of keys in unowned one-to-many relationship

  - by Kel

  I'm implementing web application with JDO in Google App Engine. According to documentation, in owned one-to-many relationships, order of elements in "owner" object collection is determined either by automatically created index field, or by information given in explicit ordering clause. For example: @PersistenceCapable public class Person { // ... @Order(extensions = @Extension(vendorName="datanucleus", key="list-ordering", value="country asc, city asc")) private List<ContactInfo> contacts = new List<ContactInfo>(); In unowned relationships, "owner" object contains collection of keys of "nested" objects, for example: @PersistenceCapable public class Author { // ... @Persistent private List<Key> books; Is order of keys preserved, if I use List<Key> collection in "owner" object for storing keys of "nested" elements? I could not find answer neither in JDO relationships article, nor in Data Classes article :(

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• Make Arrow and delete keys work in Korn shell Command line

  - by user66854

  Hi all, I am new to unix and am using sun solaris (v10 i think) . I have my shell set as korn shell . i am wondering how to make the arrow keys and delete key work in the command line . I have done set -o emacs and the backspace works , but not the arrow keys and the delete keys . Also is it possible to set the up and down arrow key to cycle through the command line history ? . any help is appreciated .

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• Need to get to the foreign keys of an entity marked as "Deleted" for auditing

  - by Abhijeet Patel

  I'm using v1 of EF(.NET 3.5 SP1). I'm subscribing to the SavingChanges event of the ObjectContext wherein I audit deletes for a particular entity type. I need to get to the foreign keys of the entity being deleted i.e EntityKeys of the related entities (RelatedEnds) but the EntityKeys of the related entities are nulls. Is there any way to get to the foreign keys of an entity which has been marked for deletion? Does EF null out the EntityKeys of all RelatedEnds for an entity which has been marked for deletion? If so, is there a way I can get hold of the foreign keys?

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• Enum : get the keys list

  - by Damien MATHIEU

  Hello, I'm not a java developer. But I'm currently taking a look at Android applications development so I'm doing a bit of nostalgy, doing some java again after not touching it for three years. I'm looking forward using the "google-api-translate-java" library. In which there is a Language class. It's an enum allowing to provide the language name and to get it's value for Google Translate. I can easily get all the values with : for (Language l : values()) { // Here I loop on one value } But what I'd want to get is a list of all the keys names (FRENCH, ENGLISH, ...). Is there something like a "keys()" method that'd allow me to loop through all the enum's keys ?

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• Obtain all keys of a Neo4j index

  - by MattiSG

  I have a Neo4j database whose content is generated dynamically from a big dataset. All “entry points” nodes are indexed on a named index (IndexManager.forNodes(…)). I can therefore look up a particular “entry point” node. However, I would now like to enumerate all those specific nodes, but I can't know on which key they were indexed. Is there any way to enumerate all keys of a Neo4j Index? If not, what would be the best way to store those keys, a data type that is eminently non-graph-oriented? UPDATE (thanks for asking details :) ): the list would be more than 2 million entries. The main use case would be to never update it after an initialization step, but other use cases might need it, so it has to be somewhat scalable. Also, I would really prefer avoiding killing my current resilience abilities, so storing all keys at once, as opposed to adding them incrementally, would be a last-resort solution.

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• KeyDown event is not Working for Arrow keys ,Home , End ,Pageup,Pagedown and other similar keys in s

  - by Subhen

  Hi , I want to over ride the selection behaviour of listbox Items. We can traverse through listbox items using Up and Down arrows where as I wan to traverse the list using Left and Right arrow keys. While I am trying to add the key down event for Listbox, It shows almost all key presses except for Arrow Keys, Home, End and Similar keys. I have the following Code: private void listArtist_KeyDown(object sender, System.Windows.Input.KeyEventArgs e) { if (e.Key.ToString() == "Enter") { //Go to Some Page } else { MessageBox.Show(e.Key.ToString()); } } I am clue less about it. Please help. Thanks, Subhen

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