I got some logs which recorded someone IP address and the URL it requests, I want to summary how many unique IP addresses request some specified URL, and request counts for one IP address.

so I filter out specified URL rows:

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grep URL_PATH *.log

then I got these rows:

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2
3
4
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6
7
8

...
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
[ 2015-08-26T23:59:59+08:00 ] 14.219.202.241 /xx
...

then I use awk print the fourth column:

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grep URL_PATH *.log | awk '{print $4}'

then I got these IPs, I stored these IPs to a file, then sort and uniq, the uniq excepts a sorted file, the -c option means count these rows:

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sort ips | uniq -c

then I got some unique rows with counts, but I want sort these rows order by counts desc:

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sort ips | uniq -c | sort -k1nr -k2

the -k1nr means the KEY starts with first field, and as (n)umber, and ®everse, the -k2 means ends with second field. The field means the column in your data.