to corresponding location in the source file. Extra features Large file support: In general, most text editors do not support large text files. Some restrict themselves to available in-core RAM while others use sophisticated virtual memory management techniques and paging algorithms. Search in files: Perform search (and possibly replace) in multiple files on disk, for example on a sub-directory and recursively all the directories below it. Similar to grep. Key bindings Support for custom key bindings. Notes, bugs Vim: custom maps of Ctrl-1 .. Ctrl-9, Ctrl-0 cannot be set, nor is Control-Shift-<char> distinguished from Ctrl-<char>. Notepad++: custom shortcuts of Shift-<char> cannot be set, they need an added modifier such as Ctrl or Alt. i.e. SCI_LINESCROLLUP cannot be bound to "Shift-I"as the "Add"button is greyed out. Emacs and Pico: pico uses most of Emacs's motion and deletion commands: ^F ^B ^P ^N ^D etc. Protocol support Support for editing files over a network or the Internet. Unicode and other character encodings To support specified character encoding, the editor must be able to load, save, view and edit text in the specific encoding and not destroy any characters. For UTF-8 and UTF-16, this requires internal 16-bit character support. Partial support is indicated if: 1) the editor can only convert the character encoding to internal (8-bit) format for editing. 2) If some encodings are supported only in some platforms. 3) If the editor can only display specific character set (such as OEM) by loading corresponding font, but does not support keyboard entry for that character set. Right-to-left and bidirectional text Support for Right-To-Left (RTL) texts is necessary for editing some languages like Arabic, Persian, Hebrew, and Yiddish and the mixture of left to right (LTR) and RTL known as bi-directional (BiDi) support. Depending on the algorithm used in the programs it might only render the bidirectional text correctly but may not be able to edit them. (e.g. Notepad++ 5.1.3 shows bidirectional texts correctly but cannot edit it and user should change the text direction to RTL to be able to edit RTL texts correctly.) Newline support See also Editor war Comparison of word processors integrated development environments HTML editors TeX editors hex editors notetaking software wiki software Lists of text editors wiki software personal information managers outliners for desktops mobile devices web-based Notes References Text editors Software comparisons