67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
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// Copyright (c) 2015 HPE Software Inc. All rights reserved.
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// Copyright (c) 2013 ActiveState Software Inc. All rights reserved.
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package main
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import (
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"flag"
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"fmt"
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"os"
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"github.com/hpcloud/tail"
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)
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func args2config() (tail.Config, int64) {
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config := tail.Config{Follow: true}
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n := int64(0)
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maxlinesize := int(0)
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flag.Int64Var(&n, "n", 0, "tail from the last Nth location")
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flag.IntVar(&maxlinesize, "max", 0, "max line size")
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flag.BoolVar(&config.Follow, "f", false, "wait for additional data to be appended to the file")
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flag.BoolVar(&config.ReOpen, "F", false, "follow, and track file rename/rotation")
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flag.BoolVar(&config.Poll, "p", false, "use polling, instead of inotify")
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flag.Parse()
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if config.ReOpen {
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config.Follow = true
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}
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config.MaxLineSize = maxlinesize
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return config, n
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}
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func main() {
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config, n := args2config()
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if flag.NFlag() < 1 {
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fmt.Println("need one or more files as arguments")
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os.Exit(1)
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}
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if n != 0 {
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config.Location = &tail.SeekInfo{-n, os.SEEK_END}
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}
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done := make(chan bool)
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for _, filename := range flag.Args() {
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go tailFile(filename, config, done)
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}
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for _, _ = range flag.Args() {
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<-done
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}
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}
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func tailFile(filename string, config tail.Config, done chan bool) {
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defer func() { done <- true }()
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t, err := tail.TailFile(filename, config)
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if err != nil {
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fmt.Println(err)
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return
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}
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for line := range t.Lines {
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fmt.Println(line.Text)
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}
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err = t.Wait()
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if err != nil {
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fmt.Println(err)
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}
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}
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