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From: Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand>
Newsgroups: comp.lang.java.programmer
Subject: “Stardate” Version Numbering
Date: Tue, 7 Jun 2011 11:59:50 +0000 (UTC)
Organization: Geek Central
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:5064

The following one-liner sets the versionName attribute in
AndroidManifest.xml to a number based on the number of days (accurate to
0.1 day) since the *nix epoch. This is what I’ve been using for a
version number in one or two projects, in lieu of anything that makes
more sense. :)

sed -i -r 's/(android:versionName=\")[^\"]*(\")/\1'"$(bc <<<"scale = 1; ($(Julian -f) - $(Julian -d 1970 1 1)) / 1")"'\2/' AndroidManifest.xml

This needs my “Julian” script, available here
<https://github.com/ldo/Julian>. Though it can probably be rewritten
to do without it, using the GNU “date” command instead...