Issue with parsing Go Command().Output()

Question

I am using a third party tool in Go with the help of exec.Command and that program will print out a large integer value which obviously is in string format. I having trouble converting that string to int (or more specifically uint64).

Details: (You can ignore what program it is etc. but after running it will return me a large integer)

cmd := exec.Command(app, arg0, arg1, arg3)
stdout, err := cmd.Output()
if err != nil {
    fmt.Println(err.Error())
    return
}
temp := string(stdout)

After I ran above, I am trying to parse it as below

myanswer, err = strconv.Atoi(temp)  //I know this is not for uint64 but I am first trying for int but I actually need uint64 conversion
if err != nil {
    fmt.Println(err)
    return
}

Problem here is that the stdout is appending \r\n to its output which AtoI is not able to parse and gives the error

strconv.Atoi: parsing "8101832828\r\n": invalid syntax

Can someone pls help me on how to convert this string output to a uint64 and also int format pls?

This link helped me! Sorry for the dup question stackoverflow.com/questions/37757683/… — Innocentguy
– Innocentguy, Commented Apr 1, 2017 at 5:28

Christian · Accepted Answer · 2021-03-11 17:30:43Z

2

The output contains special characters. First, you need to strip any these characters (e.g. \n or \r).
You can use strings.TrimSpace.

Then to parse a string as an int64, you would use:

if i, err := strconv.ParseInt(s, 10, 64); err == nil {
    fmt.Printf("i=%d, type: %T\n", i, i)
}

edited Mar 11, 2021 at 17:30

Christian

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answered Apr 1, 2017 at 5:17

VonC

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