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var dirs = %w(
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/home/user1/tmp/coverage/test
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/home/user1/tmp/covert/operator
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|
/home/user1/tmp/coven/members
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|
);
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var unique_pref = dirs.map{.split('/')}.abbrev.min_by{.len};
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var common_dir = [unique_pref, unique_pref.pop][0].join('/');
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say common_dir; # => /home/user1/tmp
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