yes

Output a string repeatedly until killed

Location

$ whereis -b yes
yes: /usr/bin/yes

Help

$ yes --help
Usage: yes [STRING]...
  or:  yes OPTION
Repeatedly output a line with all specified STRING(s), or 'y'.

      --help     display this help and exit
      --version  output version information and exit

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Full documentation at: <http://www.gnu.org/software/coreutils/yes>
or available locally via: info '(coreutils) yes invocation'

tool