Advanced Techniques in Go Programming/

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Solution 1: Telling a UNIX System What to Do

Solution 1: Telling a UNIX System What to Do

Let’s solve the challenges set in the previous lesson.

We'll cover the following...

Solution 1

Here’s the code for the wc(1) UNIX utility with the byCharacter.go, byLine.go, and byWord.go functionalities.

Michael, Oliver, 2101112225, 1600665565
Thomas, Edison, 2109416473, 1600665565
Barack, Obama, 0800123457 ,1608559905
wc.go

Code explanation

This program takes in one or more file names as command-line arguments and prints out the number of lines, words, and characters in each file, as well as the total number of lines, words, and characters across all the files.

  • Lines 10–29: The countChars() function takes a file name as input and returns the number of characters in that file and any errors that occurred. It opens the file, reads it one rune (a single Unicode character) at a time using bufio.Reader, and increments a counter for each rune. It returns the total count of characters in the ...