Grep and Count Unique String Occurance (after a string)

So I got assignment about how to get and count unique command occurance from my log. For example I had this kind of log

REQ 20161010 command=buy | title=soap | note=yes
REQ 20161010 command=loan | title=book | note=yes
RESP 20161010 command=buy | title=book | note=yes
REQ 20161009 command=loan | title=pen | note=yes
REQ 20161010 command=buy | title=ink | note=no

I need to get this kind of result

buy 3
loan 2

so, after researched it, it is actually easy. You can try this kind of command

Grep the string at any row with string “command=” between any string

grep -oh “\w*command=\w*” *

Count row that contain “string” in file.txt

grep -c string file.txt

First grep the word that contain string start with “command=” and followed by any string in buy.log. And then sort by the result. Lastly using uniq -c, count the unique occurance of the command=\w*

grep -oh “command=\w*” buy.log | sort | uniq -c

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