Q:

How remove \n from lines

file, _ := os.Open("x.txt")
    f := bufio.NewReader(file)

    for {
        read_line, _ := ReadString('\n')
        fmt.Print(read_line)

        // other code what work with parsed line...
        }

end it add \n on every line , end program to work , only work with last line...
Please put example, i try anything end any solution what i find here not work for me.

A:

You can slice off the last character:
read_line = read_line[:len(read_line)-1]

Perhaps a better approach is to use the strings library:
read_line = strings.TrimSuffix(read_line, "\n")

A:

If you want to read a file line-by-line, using bufio.Scanner will be easier. Scanner won't includes endline (\n or \r\n) into the line.
file, err := os.Open("yourfile.txt")
if err != nil {
    //handle error
    return
}
defer file.Close()

s := bufio.NewScanner(file)
for s.Scan() {
    read_line := s.Text()

    // other code what work with parsed line...
}

If you want to remove endline, I suggest you to use TrimRightFunc, i.e.
read_line = strings.TrimRightFunc(read_line, func(c rune) bool {
    //In windows newline is \r\n
    return c == '\r' || c == '\n'
})

Update:
As pointed by @GwynethLlewelyn, using TrimRight will be simpler (cleaner), i.e.
 read_line = strings.TrimRight(read_line, "\r\n")

Internally, TrimRight function call TrimRightFunc, and will remove the character if it match any character given as the second argument of TrimRight. 

