There is if you're using CGI.pm. From the POD for CGI:

DEBUGGING
If you are running the script from the command line or in the perl debugger, you can pass the script a list of keywords or parameter=value pairs on the command line or from standard input (you don't have to worry about tricking your script into reading from environment variables). You can pass keywords like this:

    your_script.pl keyword1 keyword2 keyword3
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or this:

   your_script.pl keyword1+keyword2+keyword3
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or this:

    your_script.pl name1=value1 name2=value2
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or this:

    your_script.pl name1=value1&name2=value2
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