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1 snippets
  • Create temporary file or directory in Go

    package main
    import (
    func checkErr(err error) {
        if err != nil {
    func main() {
        // The simplest way to create a temporary file is to call os.CreateTemp.
        // It will create and open the file for reading and writing.
        // We used "" as the first argument, so os.CreateTemp will create a file in the default directory.
        tmpFile, err := os.CreateTemp("", "tmpfile")
        defer os.Remove(tmpFile.Name())
        fmt.Println("Temp file name:", tmpFile.Name())
        // Write some data to the temporary file
        _, err = tmpFile.Write([]byte{1, 2, 3, 4, 5})
        // If we intend to write a lot of temporary files, we may prefer to create a temporary directory.
        // The arguments to os.MkdirTemp are the same as for os.CreateTemp, but it returns the directory name rather than the opened file.
        dName, err := os.MkdirTemp("", "tmpdir")
        defer os.RemoveAll(dName)
        fmt.Println("Temp directory name:", dName)
        fName := filepath.Join(dName, "testFile")
        err = os.WriteFile(fName, []byte{1, 2, 3, 4, 5}, 0666)
        defer os.Remove(fName)
    // Output:
    // Temp file name: /tmp/tmpfile3400905374
    // Temp directory name: /tmp/tmpdir2812568099

    During program execution, we often want to create data that is not needed after the program exits. Temporary files and directories are useful for this purpose because they do not pollute the file system over time.