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Re: ((...) && (...)) parsing confused by line break


From: Chet Ramey
Subject: Re: ((...) && (...)) parsing confused by line break
Date: Mon, 7 Feb 2005 08:53:21 -0500

> >     This script fails:
> > 
> > ( (echo line1) \
> > && (echo line2))
> > ((echo line3) && (echo line4))
> > ((echo line5) \
> > && (echo line6))
> > 
> >      like this:
> > 
> > line1
> > line2
> > line3
> > line4
> > test.sh: line 5: syntax error near unexpected token `'
> > test.sh: line 5: `&& (echo line6))'
> > 
> >     It seems as though the problem line might be being treated as
> >     though it is a ((...)) compound command, rather than nested
> >     subshells.
> 
> Of course it is.  It's inherently ambiguous.  Bash does its best,
> and is able to disambiguate in the case where everything appears on
> one line (since it's already been read and is available for analysis),
> but you can certainly fool it if you try hard enough.

I spoke too soon.  I was able to make a small change that allows this to
work.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
                                                Live...Laugh...Love
Chet Ramey, ITS, CWRU    address@hidden    http://tiswww.tis.cwru.edu/~chet/




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