migrated emacs.txt

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diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 2d6757f..db14b8c 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -3,6 +3,7 @@
 - [git](./git.md)
 - [gdb](./gdb.md)
 - [radare2](./radare2.md)
+- [emacs](./emacs.md)
 - [strace](./strace.md)
 - [lsof](./lsof.md)
 - [pidstat](./pidstat.md)
diff --git a/src/emacs.md b/src/emacs.md
new file mode 100644
index 0000000..4d59f68
--- /dev/null
+++ b/src/emacs.md
@@ -0,0 +1,67 @@
+# 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
+```