the argument to look for in the command line
the value found for the argument, or if the argument is present without an argument true, or false
if the command line is --port 8080 -n -tf
argv('--port') // => '8080'
argv('-n') // => true
argv('-g') // => false
argv('-t') // => false
argv('-f') // => false
argv('-tf') // => true
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Function to parse the command line arguments passed in and return the value of one argument