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Re: Assigning to multiple variables on same line


From: Chet Ramey
Subject: Re: Assigning to multiple variables on same line
Date: Mon, 10 Aug 2009 15:25:23 -0400
User-agent: Thunderbird 2.0.0.22 (Macintosh/20090605)

Yang Zhang wrote:
> Why does assigning to multiple variables on the same line exhibit
> sequential consistency normally but not for local variables?

Because `local' is a command, and word expansion is performed on its
arguments before it's invoked.  This means the expansion is performed
before `local' performs the assignment (local sees two arguments:
`a=x' and `b=').  Variable assignments by themselves behave differently --
expansion and assignment are done at the same time.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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