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$alloutput=`cmd 2>&1`; # This should capture both stdout and stderr.

% cat asdf
#!/bin/sh
echo "output to stdout"
echo "output to stderr" >&2

% perl -e '$x=`./asdf 2>&1`;print "Captured $x"'
Captured output to stdout
output to stderr

    $output = `cmd 2>&1`;                   # either with backticks
    $pid = open(PH, "cmd 2>&1 |");          # or with an open pipe
    while (<PH>) { }                        #    plus a read

% perl -e 'open(F,"./asdf 2>&1|");while($x=<F>){print "Captured $x";}'
Captured output to stdout
Captured output to stderr