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yes: Print a string until interrupted
yes prints the command line arguments, separated by spaces and
followed by a newline, forever until it is killed. If no arguments are
given, it prints ‘y’ followed by a newline forever until killed.
Upon a write error,
yes exits with status ‘1’.
The only options are a lone --help or --version. To output an argument that begins with ‘-’, precede it with --, e.g., ‘yes -- --help’. See Common options.