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sort ignores underscores (_)???

From: kj
Subject: sort ignores underscores (_)???
Date: Tue, 19 Feb 2008 15:58:57 +0000 (UTC)
User-agent: nn/6.7.3

sort behaves erratically with underscores:

  % ( echo _c; echo __; echo _a ) | sort 

Here, __ < _a, which implies that _ < a, but

  % ( echo _cc; echo __b; echo _ac ) | sort 

Now _ac < __b < _cc, which implies that a < _.

How can I get sort to treat _ consistently?  (I don't have a strong
preference for either _ < a or a < _ as long as it is consistent.)



NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.

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