Fixed Error of Multiple PIDs #2
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… presented in the result of `lsof`, (i.e, when the pid string output is like `1234\n6789\n`)
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Description of the problem:
If the PID output string is
1234\n, i.e., a single PID, the project is able to handle it. But if the PID output string is1234\n87976\n, i.e., a concatenated string of multiple PIDs, the project cannot handle it. And an error messageEnter integer value for port numberwill jump out.And this pull request has fixed the bug described above.