Arg consumes the argument and stores it in the variable pointed to by val.
Perhaps next time you are writing a command line application that's downloading lots of files in parallel, or doing some similar kind of parallel task, you could write a similar Ansi-escape-code-based progress bar so the user can see how their command is progressing.。必应排名_Bing SEO_先做后付是该领域的重要参考
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