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# emacs(1)
## help
```markdown
C-h f describe function
C-h b list buffer available keymaps
<kseq> C-h list possible keymaps with <kseq>
eg C-x C-h -> list keymaps beginning with C-x
```
## window
```markdown
C-x 0 kill focused window
C-x 1 kill all other windows
C-x 2 split horizontal
C-x 3 split vertical
```
## block/rect
```markdown
C-x <SPC> activate rectangle-mark-mode
M-x string-rectangle <RET> insert text in marked rect
```
## mass edit
```makrdown
C-x h mark whole buffer (mark-whole-buffer)
M-x delete-matching-line <RET> delete lines matching regex
M-x % search & replace region (query-replace)
C-M-x % search & replace regex (query-replace-regexp)
```
## grep
```markdown
M-x find-grep <RET> run find-grep result in *grep* buffer
n/p navigate next/previous match in *grep* buffer
```
## lisp mode
```markdown
M-x lisp-interaction-mode activate lisp mode
C-M-x evaluate top expr under cursor
C-x C-e eval-last-sexp
C-u C-x C-e eval-last-sexp and prints result in current buffer
```
## narrow
```markdown
C-x n n show only focused region (narrow)
C-x n w show whole buffer (wide)
```
## org
```markdown
M-up/M-down re-arrange items in same hierarchy
M-left/M-right change item hierarchy
C-RET create new item below current
C-S-RET create new TODO item below current
S-left/S-right cycle TODO states
```
### org source
```markdown
<s TAB generate a source block
C-c ' edit source block (in lang specific buffer)
C-c C-c eval source block
```
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