Duplicate Character Counter in Awk

Welcome to the Duplicate Character Counter in Awk page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

function usage() {
    print "Usage: please provide a string"
    exit(1)
}

function duplicate_character_counter(s, counts, order,  i, c) {
    for (i = 1; i <= length(s); i++) {
        c = substr(s, i, 1)
        if (!(c in counts)) {
            order[i] = c
        }

        counts[c]++
    }
}

function display_duplicate_character_counts(counts, order,  dupes, idx, c) {
    dupes = 0
    for (idx in order) {
        c = order[idx]
        if (counts[c] > 1) {
            print c ": " counts[c]
            dupes = 1
        }
    }

    if (!dupes) {
        print "No duplicate characters"
    }
}

BEGIN {
    if (ARGC < 2 || !ARGV[1]) {
        usage()
    }

    s = ARGV[1]
    duplicate_character_counter(s, counts, order)
    display_duplicate_character_counts(counts, order)
}

Duplicate Character Counter in Awk was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.