yes - output a string repeatedly until killed
S
\bSY
\bYN
\bNO
\bOP
\bPS
\bSI
\bIS
\bS
D
\bDE
\bES
\bSC
\bCR
\bRI
\bIP
\bPT
\bTI
\bIO
\bON
\bN
This manual page documents the GNU version of y
\bye
\bes
\bs. y
\bye
\bes
\bs
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