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# ps -aux | grep tail
root   19775  0.1  0.2  968  656 pts/3    S 17:07:27  0:00 grep tail
...

# ps -aux | grep 't\ail'
root    3030  0.0  0.2 1008  696 pts/4    S 10:23:21  0:00 tail -f /va
+r/adm/dd

or
# ps -aux | grep '(httpd|named)' | grep -v grep
...
@named = grep {/named/} @ps;
print "httpd's:\n\t", join("\n\t", @httpd),
 "\nnamed's:\n\t", join("\n\t", @named), "\n";