golangHow to write log to file
package main
import ( "log"; "os" )
func main() {
f, err := os.OpenFile("/tmp/log.log", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("Can't open log file", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("something to log")
}ctrl + cpackage maindefault package declaration | func main() {declare |
os.OpenFileopens file handler | log.SetOutput(will write logs to specified file handler |
log.Println(log sample message (will be logged to file) | |
Usage example
package main
import ( "log"; "os" )
func main() {
f, err := os.OpenFile("/tmp/log.log", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("Can't open log file", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("something to log")
}output
~# cat /tmp/log.log
2022/07/21 11:19:43 something to log
More of Golang
- How to generate random string
- How to sleep for 500 milliseconds
- How to generate random int
- How to get request body from HTTP server
- How to iterate over a slice in reverse order
- How to get length of map
- How to log fatal error
- How to get values slice from map
- How to sort slice
- How to set custom headers for HTTP request
See more codes...