What this snippet does
-z scans without sending data, which answers whether the port accepts connections.
Expected output
Connection to db.internal 5432 port [tcp/postgresql] succeeded! nc: connect to db.internal port 6379 (tcp) failed
Why practise typing this
Typing networking code builds muscle memory for the symbols and indentation Linux uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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