Perhaps you should just try it?
> { echo out; echo err >&2; } >f1 2>&1
> cat f1
out
err
> { echo out; echo err >&2; } 2>&1 >f1
err
> cat f1
out
Redirection order definitely DOES matter in the shell. (Hmm, unless it's shell-specific? I'm using bash)
And just to do exactly what you said..
> perl -e'print "print\n"; warn "warn"' >f1 2>&1
> cat f1
warn at -e line 1.
print
> perl -e'print "print\n"; warn "warn"' 2>&1 >f1
warn at -e line 1.
> cat f1
print
In the first case both print and warn go to the file, in the second case warn goes to stdout and print to the file.
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