ps -A | grep -e "[ /]python2.1\>" 1> /dev/null 2> /dev/null
A quick short-cut for the last part:
ps -A | grep -e "[ /]python2.1\>" >/dev/null 2>&1
"1" (stdout) is used by default, and then 2>&1 takes "2" (stderr) and sends (>) it to the same location (&) as "1".
-- Kees
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