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// Tail a file, print its contents, close it and reopen it.
//
// In this example you can add lines to the syslog log by using the logger
// command. Exit with Ctrl+C.
package main
import (
"fmt"
"time"
"github.com/nxadm/tail"
)
var logFile = "/var/log/syslog"
func main() {
// Open the file
t, err := tail.TailFile(logFile, tail.Config{Follow: true})
if err != nil {
panic(err)
}
go func() {
for line := range t.Lines {
fmt.Println(line.Text)
}
}()
time.Sleep(time.Second * 5) // Give time to the go routine to print stuff
fmt.Println("Closing the logfile " + logFile)
err = t.Stop()
if err != nil {
fmt.Printf("ERROR: %s\n", err)
}
fmt.Println("Closed the logfile " + logFile)
// If you plan to reread the same file, do not call Cleanup() as inotify/Linux will get confused.
// As the documentation states: "This function is meant to be invoked from a process's exit handler".
//t.Cleanup()
// Reopen the file and print it
t, err = tail.TailFile(logFile, tail.Config{Follow: true})
if err != nil {
panic(err)
}
defer t.Cleanup()
for line := range t.Lines {
fmt.Println(line.Text)
}
}
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