These commands allow you to keep abbrev definitions between editing sessions.
M-x write-abbrev-file reads a file name using the minibuffer and then writes a description of all current abbrev definitions into that file. This is used to save abbrev definitions for use in a later session. The text stored in the file is a series of Lisp expressions that, when executed, define the same abbrevs that you currently have.
M-x read-abbrev-file reads a file name using the minibuffer and
then reads the file, defining abbrevs according to the contents of the
file. M-x quietly-read-abbrev-file is the same except that it
does not display a message in the echo area saying that it is doing its
work; it is actually useful primarily in the `.emacs' file. If an
empty argument is given to either of these functions, they use the file
name specified in the variable abbrev-file-name, which is by
default "~/.abbrev_defs".
Emacs will offer to save abbrevs automatically if you have changed any of
them, whenever it offers to save all files (for C-x s or C-x
C-c). This feature can be inhibited by setting the variable
save-abbrevs to nil.
The commands M-x insert-abbrevs and M-x define-abbrevs are similar to the previous commands but work on text in an Emacs buffer. M-x insert-abbrevs inserts text into the current buffer before point, describing all current abbrev definitions; M-x define-abbrevs parses the entire current buffer and defines abbrevs accordingly.
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