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```
   perldoc -q STDERR
```

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Found in C:\Perl\lib\pod\perlfaq8.pod
  How can I capture STDERR from an external command?
...
        $output = `cmd 2>&1`;           # either with backticks
        $pid = open(PH, "cmd 2>&1 |");  # or with an open pipe
        while (<PH>) { }                #    plus a read