Golang golang-pipe (snippet)

Go programming example 'golang-pipe'

golang-pipe

Golang beginners example: golang-pipe

package main

import (
    "bufio"
    "fmt"
    "os"
    "regexp"
)

func main() {
    var regex string
    if len(os.Args) > 1 {
        regex = os.Args[1]
    } else {
        fmt.Fprintln(os.Stderr, "pipe.go needs at least one parameter")
        os.Exit(1)
    }
    pipe := bufio.NewScanner(os.Stdin)

    for pipe.Scan() {
        str := pipe.Text()
        matched, _ := regexp.MatchString(regex, str)
        if matched {
            fmt.Println(str)
        }
    }

    if err := pipe.Err(); err != nil {
        fmt.Fprintln(os.Stderr, "error:", err)
        os.Exit(1)
    }
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org