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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: sh changes
Message-ID: <5660@alice.uUCp>
Date: Wed, 18-Jun-86 11:42:02 EDT
Article-I.D.: alice.5660
Posted: Wed Jun 18 11:42:02 1986
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> In case you missed it, the difference is the extra colon in the Sun 3.0
> system. Questions: when and why was this change made?  Are there any
> other variants of Unix with this change? Has anybody's command file
> broken on account of this?

In case you missed it, the other difference is "if parameter is set"
vs. "if parameter is set and non-null."  I believe that the Sys V
shell supports both usages.  The point is that a parameter that
is not set is not necessarily the same as one that is set to null.