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Review

Here is a brief summary of the various functions discussed in this chapter.

describe-function
describe-variable
Print the documentation for a function or variable. Conventionally bound to C-h f and C-h v.

find-tag
Find the file containing the source for a function or variable and switch buffers to it, positioning point at the beginning of the item. Conventionally bound to M-. (that's a period following the META key).

save-excursion
Save the location of point and mark and restore their values after the arguments to  save-excursion have been evaluated. Also, remember the current buffer and return to it.

push-mark
Set mark at a location and record the value of the previous mark on the mark ring. The mark is a location in the buffer that will keep its relative position even if text is added to or removed from the buffer.

goto-char
Set point to the location specified by the value of the argument, which can be a number, a marker, or an expression that returns the number of a position, such as  (point-min) .

insert-buffer-substring
Copy a region of text from a buffer that is passed to the function as an argument and insert the region into the current buffer.

mark-whole-buffer
Mark the whole buffer as a region. Normally bound to C-x h.

set-buffer
Switch the attention of Emacs to another buffer, but do not change the window being displayed. Used when the program rather than a human is to work on a different buffer.

get-buffer-create
get-buffer
Find a named buffer or create one if a buffer of that name does not exist. The  get-buffer function returns  nil if the named buffer does not exist.

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