On 19.4.2011 09:35, Haojian Zhuang wrote:
> I still have a question. I can't find the semantic of
> ${LOCALVERSION+set} in some
> shell tutorials. Could you help me to figure out a link of introducing this?
It's a test if LOCALVERSION is set or not. See for instance
http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02,
scroll down to the table that explains the various expansions.
Michal
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