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These facilities provide information about which version of Emacs is in use.
(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.
current-time(see section 40.5 Time of Day).
emacs-build-time => (13623 62065 344633)
"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
"22.214.171.124", indicates an unreleased test version.
The following two variables have existed since Emacs version 19.23:
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