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We hit this problem in devstack [1] and maybe it is worth a backport?
consider
---
foo="hello,there"
IFS=, read hello there <<< $foo
echo $hello
echo "---"
echo $there
echo "---"
---
this ends up outputting
hello there
---
---
on bash-4.2. after some digging, the best reference is [2] . To quote from it
---
The bug is that the here string appears to undergo partial splitting using the "leaked" value of IFS being passed to read. As a result, the string becomes hello world, but is still seen by read as a single word. Since that word does not contain a :, read does not split it into two words, and the entire string is assigned to var1.
---
Thus quoting "$foo" above works around this, but it is a issue when trying to write portable shell scripts
[1] https://review.openstack.org/#/c/159366
[2] http://stackoverflow.com/questions/20144593/trying-to-split-a-string-into-two-variables
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2144.html