How to read from standard input in the console

Question

I would like to read standard input from the command line  but my attempts have ended with the program exiting before I m prompted for input  I m looking for the equivalent of Console ReadLine   in C     This is what I currently have   package main  import        bufio       fmt       os     func main         reader    bufio NewReader os Stdin      fmt Print  Enter text         text       reader ReadString   n       fmt Println text       fmt Println  Enter text         text2           fmt Scanln text2      fmt Println text2       ln           fmt Sscanln   v   ln      fmt Println ln

User · Answer

Another way to read multiple inputs within a loop which can handle an input with spaces:

package main
import (
    "fmt"
    "bufio"
    "os"
)

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    var text string
    for text != "q" {  // break the loop if text == "q"
        fmt.Print("Enter your text: ")
        scanner.Scan()
        text = scanner.Text()
        if text != "q" {
            fmt.Println("Your text was: ", text)
        }
    }
}

Output:

Enter your text: Hello world!
Your text was:  Hello world!
Enter your text: Go is awesome!
Your text was:  Go is awesome!
Enter your text: q

User · Answer

Always try to use the bufio NewScanner for collecting input from the console  As others mentioned  there are multiple ways to do the job but Scanner is originally intended to do the job  Dave Cheney explains why you should use Scanner instead of bufio Reader s ReadLine   https   twitter com davecheney status 604837853344989184 lang en  Here is the code snippet answer for your question  package main  import        bufio       fmt       os         Three ways of taking input    1  fmt Scanln  amp input     2  reader ReadString      3  scanner Scan       Here we recommend using bufio NewScanner     func main            To create dynamic array     arr    make   string  0      scanner    bufio NewScanner os Stdin      for           fmt Print  Enter Text                Scans a line from Stdin Console          scanner Scan              Holds the string that scanned         text    scanner Text           if len text     0               fmt Println text              arr   append arr  text            else               break                         Use collected inputs     fmt Println arr      If you don t want to programmatically collect the inputs  just add these lines     scanner    bufio NewScanner os Stdin     scanner Scan      text    scanner Text      fmt Println text    The output of above program will be   Enter Text  Bob Bob Enter Text  Alice Alice Enter Text   Bob Alice    Above program collects the user input and saves them to an array  We can also break that flow with a special character  Scanner provides API for advanced usage like splitting using a custom function etc  scanning different types of I O streams Stdin  String  etc

User · Answer

Can also be done like this -  package main import  fmt        func main        var myname string fmt Scanf   s    amp myname             fmt Println  Hello   myname

User · Answer

In my case  program was not waiting because I was using watcher command to auto run the program  Manually running the program go run main go resulted in  Enter text  and eventually printing to console   fmt Print  Enter text     var input string fmt Scanln  amp input  fmt Print input

User · Answer

I m not sure what s wrong with the block   reader    bufio NewReader os Stdin  fmt Print  Enter text     text       reader ReadString   n   fmt Println text    As it works on my machine  However  for the next block you need a pointer to the variables you re assigning the input to  Try replacing fmt Scanln text2  with fmt Scanln  amp text2   Don t use Sscanln  because it parses a string already in memory instead of from stdin  If you want to do something like what you were trying to do  replace it with fmt Scanf   s    amp ln   If this still doesn t work  your culprit might be some weird system settings or a buggy IDE

User · Answer

I m late to the party  But how about one liner   data  err    ioutil ReadAll os Stdin    and press ctrl d  EOT  once input is entered on command line

User · Answer

Cleanly read in a couple prompted values      Create a single reader which can be called multiple times reader    bufio NewReader os Stdin     Prompt and read fmt Print  Enter text     text       reader ReadString   n   fmt Print  Enter More text     text2       reader ReadString   n      Trim whitespace and print fmt Printf  Text1     s    Text2     s   n       strings TrimSpace text   strings TrimSpace text2     Here s a run   Enter text  Jim Enter More text  Susie Text1   Jim   Text2   Susie

User · Answer

Try this code -  var input string func main           fmt Print  Enter Your Name          fmt Scanf   s   amp input        fmt Println  Hello   input

User · Answer

you can as well try   scanner    bufio NewScanner os Stdin  for scanner Scan         fmt Println scanner Text       if scanner Err      nil          handle error

User · Answer

I think a more standard way to do this would be  package main  import  quot fmt quot   func main         fmt Print  quot Enter text   quot       var input string     fmt Scanln  amp input      fmt Print input     Take a look at the scan godoc  http   godoc org fmt Scan  Scan scans text read from standard input  storing successive space-separated values into successive arguments  Newlines count as space  Scanln is similar to Scan  but stops scanning at a newline and after the final item there must be a newline or EOF

User · Answer

You need to provide a pointer to the var you want to scan  like so   fmt scan  amp text2

[go] How to read from standard input in the console?

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