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Re: [50 character or so descriptive subject here (for reference)]


From: Chet Ramey
Subject: Re: [50 character or so descriptive subject here (for reference)]
Date: Wed, 16 May 2001 10:46:50 -0400

> Bash Version: 2.04
> Patch Level: 0
> Release Status: release
> 
> Description:
>       very strange argument splitting example.
>       Saw this in man-1.5i configuration.
>       This works correctly on:
>               bash1
>               ksh (on solaris 2.7)  (not sure which one)
>               sh  (on on solaris 2.7)

These all have bugs.

>       This doesn't work with:
>               bash2 (tried 2.04 and 2.05)
>               pdksh

These are correct.

> Repeat-By:
> IFS=":$IFS"
> FOO=/fee:/fi:/fo:/fum
> for i in /bin:/usr/bin/:/usr/ucb:$FOO

Word splitting is performed only on the results of expansion.  When
the `for' splits its arguments, it results in four words:

/bin:/usr/bin/:/usr/ucb:/fee
/fi
/fo
/fum

The first argument is re-split when the `echo $i' is performed.  You
can get a clearer picture of what's going on if you double-quote the
argument to echo:

/bin:/usr/bin/:/usr/ucb:/fee
/fi
/fo
/fum

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

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



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