awk realize the sql group by, count function
awk -F " " '{ w[$2]+=1} END{ for (a in w) print a, w[a]}' detail.csv > aaa.txt
Can refer
https://www.cnblogs.com/ginvip/p/6352157.html
http://www.blogjava.net/henry14/archive/2012/01/15/368560.html
awk -F " " '{ w[$2]+=1} END{ for (a in w) print a, w[a]}' detail.csv > aaa.txt
Can refer
https://www.cnblogs.com/ginvip/p/6352157.html
http://www.blogjava.net/henry14/archive/2012/01/15/368560.html