Which command is used to reverse the action of the undo command

In Minecraft, it is necessary to construct and demolish many things. Sometimes, things do not go according to plan. There are times when you hit a button to start the massive Redstone system, or you could explode a TNT to build new objects or to let some space go. However, the wrong TNT triggers another TNT and ruins your hours of work. Now, you have to “Undo” command for your Minecraft world. It is helpful to use /Undo when you’ve made mistakes using the /fill. Everybody gets frustrated when they’re unable to reverse the mistaken command. For instance, you can command /fill xa yb zc Minecraft: Air to get Minecraft air. However, you’ve lost your way, and you can’t remember to supply a yb with Minecraft: air substitute Minecraft: iron. You now have to start everything from scratch because of the incorrect command. It’s frustrating, isn’t it? There isn’t a way to undo a command within Minecraft. However, we have a solution. These solutions allow you to add your undo to the command, and you can easily undo your errors. Table of Contents Toggle Table of Content • • • • • • • • • Do The Undo A Command in Minecraft. There isn’t a built-in Undo system. However, if you’re ready for it, you could use the command /clone. It is recommended to copy the portion of the map (periodically) that you’re working on to another remote region. If you’d like to “undo” this, simply reverse the cycle and then clone the “backup” area into the “work” area. Tips:Be sure not to duplicate from the buil...

I've created an XML editor and I'm stuck at the last phase: adding undo/redo functionality. I've only got to add undo/redo for when users add elements, attributes, or text to the JTree. I'm still quite new at this but in school today I attempted (unsuccessfully) to create two stack object []'s called undo and redo and to add the actions performed into them. For instance, I have: Action AddElement() the performElementAction just actually adds an Element to the JTree. I want to add a way to add this action performed to my undo stack. is there a simple way to just undo.push( the entire action performed) or something? TL;DR: You can support undo and redo actions by implementing the Command (p.233) and Memento (p.283) patterns ( The Memento Pattern This simple pattern allows you to save the states of an object. Simply wrap the object in a new class and whenever its state changes, update it. public class Memento Conclusion: What makes this design powerful is the fact that you can add as many commands as you like (by extending the Command class) e.g., RemoveCommand, UpdateCommand and so on. Moreover, the same pattern is applicable to any type of object, making the design reusable and modifiable across different use cases. @Atlas2k you can have a threshold (e.g., int threshhold = 30) and then remove all the "older" commands based on the current stack size. For instance, if you call insertCommand() and your commandStack.size() is bigger than 30, then you remove the first element ...

Linux (like other unices) doesn't natively provide an undo feature. The philosophy is that if it's gone, it's gone. If it was important, it should have been backed up. There is a fuse filesystem that automatically keeps copies of old versions: The best way to protect against such accidents is to use a version control system (cvs, bazaar, darcs, git, mercurial, subversion, ...). It takes a little time to learn, but it pays off awesomely in the medium and long term. backup wont give you an undo neither. Though ZFS (and other system like) that has its warts including this: a lot of alike disks in usage ? One fails ? Ok ZFS will probably protect against that .... but alike disks ie made at about the same time at the same production line ? When will the next one fail ?? No there is no magical undo in any Unix. Unix assumes that you know what you are doing. For Undo support use a VCS (your text editor probably has it built in too). Most filesystems do not have the capability of doing it transparently. Time machine and system restore on mac and windows respectively are just backup/change control systems. There is no undo in the command line. You can however, run commands as rm -i and mv -i. This will prompt you with an "are you sure?" question before they execute the command. It's also possible to add an alias for it to a startup script (e.g. ~/.bashrc or /etc/bash.bashrc): alias remove='rm -i' alias move='mv -i' Edit: by the suggestions below, I've removed my advice to alias the...

Contents • Can you undo an undo Mac? • How do you reverse Ctrl Z in Excel? • How do I undo Ctrl T? • How many worksheets can you undelete using the undo command? • What is the shortcut of undo? • Where is the undo button in notes? • What is the opposite of Ctrl Z? • How do I undo all changes in Excel? • How do I undo Excel save and close? • How do I undo an undo in Photoshop? • How do I undo all? • What is difference between undo and redo? • How does undo work? • How do I undo on my phone? • How do you bring back something you deleted while typing? • How do I turn on undo typing? • How do I undo CTRL D? • Why CTRL Z is undo? • What is the use of undo command? • Why do we need the Undo and redo features while working on a worksheet? • How many consecutive actions or commands can you reverse using the Undo feature in Word? Undo the last action: Choose Edit > Undo (from the Edit menu at the top of your screen), or press Command-Z on your keyboard. … Redo the last action you undid: Choose Edit > Redo, or press Command-Shift-Z. How do you reverse Ctrl Z in Excel? Xerox debuted the Ctrl+Z shortcut for Undo in 1974. When Excel was released for Apple computers in 1985, it used Cmd+Z for Undo. Later, Windows 3.1 introduced Alt+Backspace as the shortcut for Undo. Today, you can undo with Ctrl+Z or Alt+Backspace in Windows or Cmd+Z on a Mac. How do I undo Ctrl T? Each press of the shortcut indents the hang one more tab stop. You can also use Shift+Ctrl+T to undo the indent by one tab...

In SQL Server Management Studio, I did the query below. Unfortunately, I forgot to uncomment the WHERE clause. 1647 rows were updated instead of 4. How can I undo the last statement? Unfortunately, I've only just finished translating those 1647 rows and was doing final corrections , and thus don't have a backup. UPDATE [dbo].[T_Language] SET [LANG_DE] = 'Mietvertrag' -- ,[LANG_FR] = 'Contrat de bail' -- ,[LANG_IT] = 'Contratto di locazione' -- ,[LANG_EN] = 'Tenancy agreement' -- --WHERE [LANG_DE] like 'Mietvertrag' There is a transaction protocol, at least I hope so. You also need to check that the database isn't in auto_truncate mode (it doesn't sound like it will be which is good!) SELECT name,recovery_model_desc, CASE WHEN last_log_backup_lsn IS NULL THEN 'On' ELSE 'Off' END as AutoTruncate FROM sys.databases d join sys.database_recovery_status r ON r.database_id=d.database_id Assuming that this is the case then you should be good to use your backup and do a point in time restore (do this as a new database to be safe). More details If you already have a full backup from your database, fortunately, you have an option in SQL Management Studio. In this case, you can use the following steps: • Right click on database -> Tasks -> Restore -> Database. • In General tab, click on Timeline -> select Specific date and time option. • Move the timeline slider to before update command time -> click OK. • In the destination database name, type a new name. • In the Files tab, check...

If you want to know the keyboard shortcut for Undo and Redo in Microsoft Word, Excel, and other Windows applications, read this post. A keyboard shortcut is perhaps the easiest way to perform an action on a Windows computer. Keyboard shortcuts help us work quickly and more efficiently. When we use the keyboard instead of the mouse, we can accomplish multiple tasks with increased precision. Hence, keyboard shortcuts not only save us time but also help us to be more productive at work. If you’re a beginner, there are a lot of Before we discuss how you may Undo or Redo using your keyboard, let us first understand what actions these commands perform. The ‘Undo’ command can be used to undo an action and the ‘Redo’ command can be used to redo an undone action on a Windows PC. In other words, the Undo command helps you reverse the last action by restoring things back to their previous state. The Redo command does just the opposite. It reverses the action you’ve undone. So basically the Undo command is used to fix things up, while the Redo command is used to fix Undo, in case you change your mind. For example, if you’ve deleted some text while typing something on a Windows PC, you can bring the text back using the Undo command. If you again want to delete the text, you can use the Redo command. The Undo and Redo actions can easily be performed by clicking on the Undo/Redo icons (the left-pointing arrow and the right-pointing arrow) in the Quick Access Toolbar of an application. Ho...

I've created an XML editor and I'm stuck at the last phase: adding undo/redo functionality. I've only got to add undo/redo for when users add elements, attributes, or text to the JTree. I'm still quite new at this but in school today I attempted (unsuccessfully) to create two stack object []'s called undo and redo and to add the actions performed into them. For instance, I have: Action AddElement() the performElementAction just actually adds an Element to the JTree. I want to add a way to add this action performed to my undo stack. is there a simple way to just undo.push( the entire action performed) or something? TL;DR: You can support undo and redo actions by implementing the Command (p.233) and Memento (p.283) patterns ( The Memento Pattern This simple pattern allows you to save the states of an object. Simply wrap the object in a new class and whenever its state changes, update it. public class Memento Conclusion: What makes this design powerful is the fact that you can add as many commands as you like (by extending the Command class) e.g., RemoveCommand, UpdateCommand and so on. Moreover, the same pattern is applicable to any type of object, making the design reusable and modifiable across different use cases. @Atlas2k you can have a threshold (e.g., int threshhold = 30) and then remove all the "older" commands based on the current stack size. For instance, if you call insertCommand() and your commandStack.size() is bigger than 30, then you remove the first element ...

In Minecraft, it is necessary to construct and demolish many things. Sometimes, things do not go according to plan. There are times when you hit a button to start the massive Redstone system, or you could explode a TNT to build new objects or to let some space go. However, the wrong TNT triggers another TNT and ruins your hours of work. Now, you have to “Undo” command for your Minecraft world. It is helpful to use /Undo when you’ve made mistakes using the /fill. Everybody gets frustrated when they’re unable to reverse the mistaken command. For instance, you can command /fill xa yb zc Minecraft: Air to get Minecraft air. However, you’ve lost your way, and you can’t remember to supply a yb with Minecraft: air substitute Minecraft: iron. You now have to start everything from scratch because of the incorrect command. It’s frustrating, isn’t it? There isn’t a way to undo a command within Minecraft. However, we have a solution. These solutions allow you to add your undo to the command, and you can easily undo your errors. Table of Contents Toggle Table of Content • • • • • • • • • Do The Undo A Command in Minecraft. There isn’t a built-in Undo system. However, if you’re ready for it, you could use the command /clone. It is recommended to copy the portion of the map (periodically) that you’re working on to another remote region. If you’d like to “undo” this, simply reverse the cycle and then clone the “backup” area into the “work” area. Tips:Be sure not to duplicate from the buil...

Contents • Can you undo an undo Mac? • How do you reverse Ctrl Z in Excel? • How do I undo Ctrl T? • How many worksheets can you undelete using the undo command? • What is the shortcut of undo? • Where is the undo button in notes? • What is the opposite of Ctrl Z? • How do I undo all changes in Excel? • How do I undo Excel save and close? • How do I undo an undo in Photoshop? • How do I undo all? • What is difference between undo and redo? • How does undo work? • How do I undo on my phone? • How do you bring back something you deleted while typing? • How do I turn on undo typing? • How do I undo CTRL D? • Why CTRL Z is undo? • What is the use of undo command? • Why do we need the Undo and redo features while working on a worksheet? • How many consecutive actions or commands can you reverse using the Undo feature in Word? Undo the last action: Choose Edit > Undo (from the Edit menu at the top of your screen), or press Command-Z on your keyboard. … Redo the last action you undid: Choose Edit > Redo, or press Command-Shift-Z. How do you reverse Ctrl Z in Excel? Xerox debuted the Ctrl+Z shortcut for Undo in 1974. When Excel was released for Apple computers in 1985, it used Cmd+Z for Undo. Later, Windows 3.1 introduced Alt+Backspace as the shortcut for Undo. Today, you can undo with Ctrl+Z or Alt+Backspace in Windows or Cmd+Z on a Mac. How do I undo Ctrl T? Each press of the shortcut indents the hang one more tab stop. You can also use Shift+Ctrl+T to undo the indent by one tab...

In SQL Server Management Studio, I did the query below. Unfortunately, I forgot to uncomment the WHERE clause. 1647 rows were updated instead of 4. How can I undo the last statement? Unfortunately, I've only just finished translating those 1647 rows and was doing final corrections , and thus don't have a backup. UPDATE [dbo].[T_Language] SET [LANG_DE] = 'Mietvertrag' -- ,[LANG_FR] = 'Contrat de bail' -- ,[LANG_IT] = 'Contratto di locazione' -- ,[LANG_EN] = 'Tenancy agreement' -- --WHERE [LANG_DE] like 'Mietvertrag' There is a transaction protocol, at least I hope so. You also need to check that the database isn't in auto_truncate mode (it doesn't sound like it will be which is good!) SELECT name,recovery_model_desc, CASE WHEN last_log_backup_lsn IS NULL THEN 'On' ELSE 'Off' END as AutoTruncate FROM sys.databases d join sys.database_recovery_status r ON r.database_id=d.database_id Assuming that this is the case then you should be good to use your backup and do a point in time restore (do this as a new database to be safe). More details If you already have a full backup from your database, fortunately, you have an option in SQL Management Studio. In this case, you can use the following steps: • Right click on database -> Tasks -> Restore -> Database. • In General tab, click on Timeline -> select Specific date and time option. • Move the timeline slider to before update command time -> click OK. • In the destination database name, type a new name. • In the Files tab, check...