Golang : Read a file line by line
Got another newbie to Golang asking me for help today on how to read a file line by line. The simplest way that I can think of is to use the bufio.NewScanner() and scanner.Scan() functions. Below is a sample code for reading a text file line by line.
Content of file.dat
First
Second
Third
Fourth
Fifth
and the program will read the file
package main
import (
"bufio"
"fmt"
"os"
)
func main() {
file, err := os.Open("./file.dat")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer file.Close()
reader := bufio.NewReader(file)
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}
and output the following
First
Second
Third
Fourth
Fifth
Reference :
See also : Golang : Scanf function weird error in Windows
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+15.2k Golang : Convert date format and separator yyyy-mm-dd to dd-mm-yyyy
+26.3k Golang : How to check if a connection to database is still alive ?
+4.5k Nginx and PageSpeed build from source CentOS example
+14.4k Golang : Search folders for file recursively with wildcard support
+5k Golang : Qt update UI elements with core.QCoreApplication_ProcessEvents
+26.6k Golang : Find files by name - cross platform example
+12.8k Android Studio : Password input and reveal password example
+22.2k Golang : Strings to lowercase and uppercase example
+15k Golang : rune literal not terminated error
+16.6k Golang : Get number of CPU cores
+16.3k Golang : Gzip file example