時間単位

# grep "21/Jan/" example.com_access_log-20180122 | awk '{print $4}' | cut -b 1-15 | sort | uniq -c

   7564 [21/Jan/2018:03
  11325 [21/Jan/2018:04
  10546 [21/Jan/2018:05
  12907 [21/Jan/2018:06
  26018 [21/Jan/2018:07
  32649 [21/Jan/2018:08

(略)

10分単位

# grep "21/Jan/" example.com_access_log-20180122 | awk '{print $4}' | cut -b 1-17 | sort | uniq -c

   2519 [21/Jan/2018:03:3
   3125 [21/Jan/2018:03:4
   1927 [21/Jan/2018:03:5
   2472 [21/Jan/2018:04:0
   1552 [21/Jan/2018:04:1
   1665 [21/Jan/2018:04:2
   1681 [21/Jan/2018:04:3
   2392 [21/Jan/2018:04:4
   1554 [21/Jan/2018:04:5
   1145 [21/Jan/2018:05:0
   1658 [21/Jan/2018:05:1
   1578 [21/Jan/2018:05:2

(略)