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/usr/share/awk/walkarray.awk is in gawk 1:4.1.4+dfsg-1build1.

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The actual contents of the file can be viewed below.

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function walk_array(arr, name,      i)
{
    for (i in arr) {
        if (isarray(arr[i]))
            walk_array(arr[i], (name "[" i "]"))
        else
            printf("%s[%s] = %s\n", name, i, arr[i])
    }
}