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  1. or download this
    > echo "abcd" | perl -nle '/(b).(d)/ && print "$1" '
b
...
d
> echo "abcd" | perl -nle '/(b).(d)/ && print "$1 $2" '
Can't open $2 : No such file or directory.
  2. or download this
    > echo "abcd" | perl -nle '/(b).(d)/ && print \`"$1 $2\`" '
Can't find string terminator "`" anywhere before EOF at -e line 1.