yes invocation (GNU Coreutils 9.0)
From Get docs
Coreutils/docs/latest/yes-invocation
Previous: printf invocation, Up: Printing text [Contents][Index]
15.3 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.