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# Redirect STDOUT.

...
}

print(...);  # Goes to file if one was specified, else STDOUT.

# Use select.

...
}

print(...);  # Goes to file if one was specified, else STDOUT.

# If you want to output to STDOUT and to the file,
# create a handle which may point to STDOUT.
...

print FILE (...);  # Goes to file if one was specified, else STDOUT.
print(...);        # Goes to STDOUT.