A.awk’{print$1}’access_log B.sed’{print$1}’access_log C.grep’{print$1}’access_log D.cat’{print$1}’access_log
A.cat access_log∣grep“12/Aug/2009” B.cat access_log∣sort“12/Aug/2009” C.cat access_log∣awk“12/Aug/2009” D.cat access_log∣sed“12/Aug/2009”