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A simple command line joiner program (hobby program)

This is a simple program which can join lines from stdin. The program is only 27 loc. I won't add features like pasting lines inside of a file. You can do everything just using stdin/stdout. Another advantage of this simple implementation that it does not use heap, only stack. This reduces the chance of getting corrupted memory. Althought This program provides better defaults (coma is the default separator), we sacrifice the speed for input containing many line. For that purpoce: use paste -sd,