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並前往https://superuser.com/questions/790557/what-does-exactly-mean-in-echo-temp-txt

What does “<>” exactly mean in “echo <> temp.txt”? - Super User

>&3 # Write a decimal point there. exec 3>&- # Close fd 3. cat File # ==> 1234.67890 # Random access, by golly. So, echo <> temp.txt.

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