1.3 Finding Duplicate Lines
Programs for file copying, printing, searching, sorting, counting,
and the like all have a similar structure: a loop over the input,
some computation on each element, and generation of output on the
fly or at the end.
We’ll show three variants of a program called dup; it is partly inspired
by the Unix uniq command, which looks for adjacent duplicate lines.
The structures and packages used are
models that can be easily adapted.
The first version of dup prints each line that appears
more than once in the standard input, preceded by its count.
This program introduces the if statement, the map data type, and
the bufio package.
// Dup1 prints the text of each line that ...
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