Go command line parameter parsing flag packet

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The flag package provided by the go language can parse the command line parameters, code:

The package main import ("Flag" "FMT") func main () {///first parameter, parameter name, second parameter is the default value, the third parameter is description username: = Flag. String ("name", "", "Input your username") flag. Parse () fmt. Println ("Hello,", *username)}

　　

Compile:

Go Build Flag.go

Run:

./flag-name=world

Output:

Hello, World

If you do not enter the name parameter:

./flag

The output:

Hello,