Difference between revisions of "Registers"
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Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times. | Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times. | ||
| − | === Naming | + | === Naming convention === |
| − | + | There are 62 registers, each with a single character for a name: | |
| + | |||
* from a to z | * from a to z | ||
* from A to Z, different from a to z | * from A to Z, different from a to z | ||
Revision as of 14:36, 28 March 2013
Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times.
Naming convention
There are 62 registers, each with a single character for a name:
- from a to z
- from A to Z, different from a to z
- from 0 to 9
Functions
A register can store a position, a piece of text, a rectangle, a number, a window configuration, or a file name, but only one thing at any given time. Whatever you store in a register remains there until you store something else in that register.
How to use
| Type | How to save | How to use | Other useful command |
|---|---|---|---|
| Position | C-x r <SPC> r | jump: C-x r j r | |
| Text | C-x r s r | insert: C-x r i r | m-x append-toregister <RET> r; m-x prepend-to-register <RET> r |
| Rectangle | C-x r r r | insert: C-x r i r | |
| Window Config | C-x r w r | restore: C-x r j r | save all frame's window: C-x r f r |
| Number | C-u number C-x r n r | insert: C-x r i r | increment: C-x r + r |
| File | (set-register ?z '(fine . name)) | jump: C-x r j r |
- To see what register r contains, use M-x view-register
Bookmark
Bookmarks can be thought as register with a long name and surviving between Emacs session.