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I want to have a single .emacs file, under version control. Unfortunately, different systems have different versions of Emacs running. How do I detect the Emacs version from within Elisp?

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You can test variables emacs-major-version and emacs-minor-version, which return numbers.

You can also use functions (predicates) version<, version<=, and version= to test. Or functions version-list-<, version-list-<=, version-list=, and version-list-not-zero, together with function version-to-list.

Function emacs-version (or just version) returns a string completely describing the version.

  • Thanks. Just what I wanted. I did an apropos but didn't find those. – vy32 Mar 8 '18 at 1:22

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