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摘要： Use os.Exit to immediately exit with a given statuspackage mainimport ( "fmt" "os")func main() { defer fmt.Println("!") os.Exit(3)}exit st... 阅读全文

摘要： Sometimes we'd like our Go programs to intelligently handle Unix signals. For example, we might want a server to gracefully shutdown when it receives ... 阅读全文

摘要： In the previous example we looked at spawning external processes. We do this when we need an external process accessible to running Go process. Someti... 阅读全文

摘要： Sometimes our Go programs need to spawn other, non-Go process. For example, the syntax highlighting on this site is implemented by spawning a pygmenti... 阅读全文

摘要： Environment variables are a univerial mechanism for conveying configuration information to Unix programs. Let's look at how to set, get, and list envi... 阅读全文

摘要： Command-line flags are a common way to specify options for command-line programs. For eample, in wc -l the -l is a command-line flagpackage mainimport... 阅读全文

摘要： Command-line arguments are a common way to parameterize execution of programs. For example, go run hello.go uses run and hello.go arguments to the go ... 阅读全文

摘要： A line filter is a common type of program that reads input on stdin, processes it, and then prints some derived result to stdout. grep and sed are com... 阅读全文

摘要： Writing files in Go follows similar patterns to the ones we saw earlier for readingpackage mainimport ( "bufio" "fmt" "io/ioutil" "os")fun... 阅读全文

摘要： Reading and writing files are basic tasks needed for many Go programs. First we'll look at some examples of reading filespackage mainimport ( "bufi... 阅读全文