This second demonstration of emacs accompanies
http://pages.stat.wisc.edu/~jgillett/DSCP/emacs/emacs.html. It covers
the more advanced lines that are crossed out.

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Practice with emacs:
- Clean up from first demo by deleting all downloaded files:
  - open ~/emacs directory: C-x C-f ~/e TAB Enter
  - mark all files for deleting (one d per file line): d d d d
  - expunge marked files: x y
  - Use wget download data.txt and tiny.R into ~/emacs again (to
    restore them)
- Cursor Motion
  - open ~/emacs/data.txt: C-x C-f ~/e TAB d TAB Enter
  - jump to start and end of line (twice): C-a C-e  C-a C-e
  - jump to start and end of buffer (twice): M-< M->  M-< M->
    (note that Shift is required to type < or >)
- Cut, Copy, Paste
  - jump to start: M-<
  - kill (kill, undo, next) all four rows, one at a time:
    C-k C-/ C-n  C-k C-/ C-n  C-k C-/ C-n  C-k C-/ C-n
  - add blank line: Enter
  - yank; then replace last yank with previous kill (3 times):
    C-y  M-y M-y M-y
  - clean up yank via jump to start of line, kill: C-a C-k
  - use "yank; replace last yank with previous kill" to write four
    lines reversed:
    C-y M-y Enter  C-y M-y Enter  C-y M-y Enter  C-y M-y Enter
  - M-x revert-buffer Enter y
  - use "kill, yank rectangle region" to move 2nd (ID) column left:
    - set mark at top left of 2nd column: C-s 1 C-b C-SPACE
    - move to "j" past bottom right of 2nd column: C-s jj C-b C-b
    - kill rectangle region: C-x r k
    - jump to start of buffer: M-<
    - yank rectangle region: C-x r y
    - undo twice: C-/ C-/
- Error Recovery
  - restore buffer to original contents: M-x revert-buffer Enter y
- Multiple Windows
  - split window vertically: C-x 2
  - switch to other window (twice): C-x o  C-x o
  - open tiny.R: C-x C-f t TAB Enter
  - copy first line of data.txt into bottom of tiny.R:
    C-x o C-k C-/  C-x o M-> C-y
  - make one window: C-x 1
  - split window horizontally: C-x 3
  - make one window: C-x 1
  - go nuts: C-x 2 C-x 3 M-<  C-x o M->  C-x o C-x C-f data.txt Enter
  - recover: C-x 1
- Incremental Search
  - regexp search forward, regexp search backward:
    see http://pages.stat.wisc.edu/~jgillett/DSCP/emacs/regularExpressions.pdf
  - find all occurences of "123" in data.txt:
    C-x C-f d TAB Enter M-x occur Enter 123 Enter
- Query Replace
  - interactively replace regexp: see regularExpressions.pdf
- Regular Expressions for search and query replace: see regularExpressions.pdf
- R
  - find tiny.R: C-x C-f t TAB Enter
  - indent buffer: M-< (jump to top), C-SPACE (set mark),
    M-> (jump to bottom), M-x indent-region Enter
  - split window vertically, switch to other: C-x 2 C-x o
  - start R buffer: M-x R Enter Enter  C-x o
  - run one line of R code (5 times): C-c C-n  C-c C-n  C-c C-n  C-c C-n  C-c C-n
  - jump to start of buffer: M-<
  - run chunk of R code (3 times): C-c C-c  C-c C-c  C-c C-c
  - run buffer of R code: C-c C-b
  - show documentation for R mode (ESS): M-x help Enter m
- Help
  - show function a key runs (e.g. what does C-w do?): M-x help Enter k C-w