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GNU Emacs Lisp Reference Manual

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1.4 Version Information

These facilities provide information about which version of Emacs is in use.

Command: emacs-version
This function returns a string describing the version of Emacs that is running. It is useful to include this string in bug reports.

 
(emacs-version)
  => "GNU Emacs 20.3.5 (i486-pc-linux-gnulibc1, X toolkit)
 of Sat Feb 14 1998 on psilocin.gnu.org"

Called interactively, the function prints the same information in the echo area.

Variable: emacs-build-time
The value of this variable indicates the time at which Emacs was built at the local site. It is a list of three integers, like the value of current-time (see section 40.5 Time of Day).

 
emacs-build-time
     => (13623 62065 344633)

Variable: emacs-version
The value of this variable is the version of Emacs being run. It is a string such as "20.3.1". The last number in this string is not really part of the Emacs release version number; it is incremented each time you build Emacs in any given directory. A value with four numeric components, such as "20.3.9.1", indicates an unreleased test version.

The following two variables have existed since Emacs version 19.23:

Variable: emacs-major-version
The major version number of Emacs, as an integer. For Emacs version 20.3, the value is 20.

Variable: emacs-minor-version
The minor version number of Emacs, as an integer. For Emacs version 20.3, the value is 3.


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