A.cat logfile∣tail-10
B.cat logfile∣head-10
C.cat logfile∣more-10
D.cat logfile∣less-10

A.cat access_log∣sed’{print$7}’∣grep’.png’∣sort∣uniq-c∣sort-nr
B.cat access_log∣awk’{print$7}’∣grep’.png’∣sort∣uniq-c∣sort-nr∣head-n10
C.cat access_log∣grep’{print$7}’∣sed’.png’∣sort∣uniq-c
D.cat access_log∣awk’{print$7}’∣grep’.png’∣sort∣uniq-c∣sort-nr∣tail-n10