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package main
import (
"fmt"
"os"
"strings"
)
func main() {
os.Setenv("FOO", "1")
fmt.Println("FOO:", os.Getenv("FOO"))
fmt.Println("BAR:", os.Getenv("BAR"))
fmt.Println()
for _, e := range os.Environ() {
pair := strings.SplitN(e, "=", 2)
fmt.Println(pair[0])
}
}