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Define an abbrev, using one or more words before point as its expansion
(add-global-abbrev).
Similar, but define an abbrev specific to the current major mode
(add-mode-abbrev).
Define a word in the buffer as an abbrev (inverse-add-global-abbrev).
Define a word in the buffer as a mode-specific abbrev
(inverse-add-mode-abbrev).
This command discards all abbrev definitions currently in effect, leaving a blank slate.
The usual way to define an abbrev is to enter the text you want the
abbrev to expand to, position point after it, and type C-x a g
(add-global-abbrev). This reads the abbrev itself using the
minibuffer, and then defines it as an abbrev for one or more words before
point. Use a numeric argument to say how many words before point should be
taken as the expansion. For example, to define the abbrev `foo' as
mentioned above, insert the text `find outer otter' and then type
C-u 3 C-x a g f o o RET.
An argument of zero to C-x a g means to use the contents of the region as the expansion of the abbrev being defined.
The command C-x a l (add-mode-abbrev) is similar, but
defines a mode-specific abbrev. Mode-specific abbrevs are active only in a
particular major mode. C-x a l defines an abbrev for the major mode
in effect at the time C-x a l is typed. The arguments work the same
as for C-x a g.
If the text already in the buffer is the abbrev, rather than its
expansion, use command C-x a i g
(inverse-add-global-abbrev) instead of C-x a g, or use
C-x a i l (inverse-add-mode-abbrev) instead of C-x a
l. These commands are called "inverse" because they invert the
meaning of the two text strings they use (one from the buffer and one
read with the minibuffer).
To change the definition of an abbrev, just define a new definition. When the abbrev has a prior definition, the abbrev definition commands ask for confirmation before replacing it.
To remove an abbrev definition, give a negative argument to the abbrev definition command: C-u - C-x a g or C-u - C-x a l. The former removes a global definition, while the latter removes a mode-specific definition.
M-x kill-all-abbrevs removes all the abbrev definitions there are, both global and local.
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