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And this is not only Ubuntu. E.g.: http://blog.venthur.de/2008/11/10/rm-rf/
rm -rf / limitation is from Solaris
Posted Apr 4, 2009 0:03 UTC (Sat) by nix (subscriber, #2304)
* Major changes in release 5.1.0 (2003-12-21):
** New features
chgrp, chmod, chown, and rm accept the new options:
--preserve-root, --no-preserve-root (default)
Posted Apr 4, 2009 9:10 UTC (Sat) by tzafrir (subscriber, #11501)
That extra switch is nice. However according to the coreutils changelog, --preserver-root was made the default of rm on 2006-02-09 (didn't check to which version it applies).
That 2004 blog entry is after the Solaris guys successfully changed POSIX, which I assume takes its own extra time.
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