Top Posts Tagged with #pkg~os

Read from stdin or file

Sometimes, you want to specify a file to read with command line argument. Sometimes, you want to read from stdin. Following is a simple way to do it.

func openStdinOrFile() io.Reader { var err error r := os.Stdin if len(os.Args) > 1 { r, err = os.Open(os.Args[1]) if err != nil { panic(err) } } return r } func main() { r := openStdinOrFile() readSomething(r) }

#pkg~io #pkg~os

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Create a temporary file

Use os.TempDir() to get the name of the directory and ioutil.TempFile() to create a file.

file, err := ioutil.TempFile(os.TempDir(), "prefix") defer os.Remove(file.Name())

It's caller's responsibility to remove the file.

#pkg~io~ioutil #pkg~os