32 lines
587 B
Go
32 lines
587 B
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 8.
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//!+
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// Dup1 prints the text of each line that appears more than
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// once in the standard input, preceded by its count.
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package main
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import (
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"bufio"
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"fmt"
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"os"
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)
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func main() {
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counts := make(map[string]int)
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input := bufio.NewScanner(os.Stdin)
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for input.Scan() {
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counts[input.Text()]++
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}
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// NOTE: ignoring potential errors from input.Err()
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for line, n := range counts {
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if n > 1 {
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fmt.Printf("%d\t%s\n", n, line)
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}
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}
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}
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//!-
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