A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Vim reads initialization commands from a file called vimrc on startup. This can be used to set settings, define functions, execute autocommands, and more.
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Doing an action when pressing a key. These are also called key mappings or mappings. For questions about default key bindings, as well as creating or redefining key bindings.
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A scripting language embedded into Vim. It can be used to customize Vim to suit your needs and to create plugins. Also called VimL.
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A project that seeks to refactor Vim. Use this tag for questions specifically regarding Neovim-only features (i.e. features not found in Vim and other Vi-like editors).
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the use of colours, size, typeface, or other attributes to visually indicate it has a special meaning and therefore make it easier to understand the text. For example, marking l…
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Regular expressions (often shortened to "regex") are expressions written in a declarative language used for matching patterns within strings.
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Searching for text with / or search(). For find/replace operations, use tag [substitute] instead.
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Questions on ex- or colon-commands. For questions about command-line options used to launch the editor, use the [invocation] tag.
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Prefixing lines with whitespace to aid in readability.
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the GUI version of Vim (opposed to Vim running in a terminal emulator). It behaves exactly the same, but has additional graphical features.
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The representation of a file loaded into memory. Edits are performed on buffers.
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Questions about cutting, copying, and pasting text. In Vim, "cut" is also called "delete", "copy" is also called "yank", and "paste" is also called "put".
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A terminal emulator (or terminal, for short) displays characters, colours, and the cursor on the screen. Vi & Vim are run inside of a terminal, gVim is not.
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For questions about the several commands to complete part of a keyword or line that has been typed.
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Any operation involving regular expression based substitution of text, such as the ex-mode `:s` command. Not to be confused with the [replace] tag.
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commands executed automatically on certain events. Questions on creating or modifying `autocmd` definitions are appropriate for this tag.
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Moving the cursor another place in the buffer.
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a flexible and easy way to select a piece of text for an operator.
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The mode in Vi and Vim in which you can insert text to the open document.
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Commands that moves the cursor. A motion command is used after an operator command to move over the text that is to be operated upon.
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For questions specific to Vim implementations on the Microsoft Windows operating system.
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a view of a buffer. A tab page comprises one or more windows. For questions about interaction with the Microsoft operating system, use [microsoft-windows]. For questions about interact…
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Questions about calling external (shell) commands from within Vi or Vim.
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a Vim script which sets the colors to be used for the highlight groups.
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the initial mode. Vim calls this Normal mode. Not to be confused with command-line-mode, which is what you get after you press :, /, ?, or !
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Command or mode to overwrite text. For search-and-replace operations, use the [substitute] tag.
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Adding highlighting to the document other than syntax highlighting (such as hlsearch or :match)
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Vim's plugin system. NOT for questions about a specific plugin (use the appropriate plugin-* tag) or questions that may require a plugin.
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Question about the use of functions in Vimscript defined in the `.vimrc` or a script file.
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A feature which lets visually hide (and toggle) regions of a text file, by replacing its contents with a single outline line.
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Questions about how to format a file with vim - this includes, but is not limited to, foldings, indents, wrappings, and so on.
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Questions about making Vim to have a defined behavior according the type of the edited file.
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a recording of typed commands that can be executed later. Macros are stored in registers; recording a macro can be done with q, and you can run them with @.
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Netrw adds directory listing to Vim, and allows you to open files over the network (ftp, http, scp, etc). It is a plugin bundled with Vim.
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Questions about splitting current window into multiple viewports.
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Questions about editing Tex documents, either with or without a frontend such a LaTeX.