My 2˘ - a very basic kata, featuring the usage of kill:

karls-mac-mini:monks karl$  perl -e 'print $$;sleep;' &
[1] 434
karls-mac-mini:monks karl$ jobs
[1]+  Running                 perl -e 'print $$;sleep;' &
karls-mac-mini:monks karl$ ps aux | grep [p]erl
karl            434   0,0  0,0  2440564   2148 s000  S     7:20pm   0:
+00.01 perl -e print $$;sleep;
karls-mac-mini:monks karl$  perl -e 'print kill q(TERM), 434;'
1[1]+  Terminated: 15          perl -e 'print $$;sleep;'
karls-mac-mini:monks karl$ jobs
karls-mac-mini:monks karl$ ps aux | grep [p]erl
karls-mac-mini:monks karl$
[download]

Regards, Karl