[ale] Redirecting STDERR

[mic at mathcs.emory.edu (Michelangelo Grigni)]

The following "exec" line swaps stdout and stderr; it
should work with bash or ksh:

echo hello to stdout
exec 3>&1 1>&2 2>&3
echo hello to stderr
exec 3>&1 1>&2 2>&3
echo hello to stdout again
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