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Use this:

/def -i pid_of = \
/quote -S /eval /let pid_what=`"/@ps -r" %%; \
/if (strstr(pid_what, {*}) != -1) \
/first %%{pid_what} %%; \
/endif

/def rstop = /kill $(/pid_of %{*})

And then... /rstop Hello world

Infinite repeats are in b8, /repeat -5 i say Hello world.

R.