awk处理多个文件查询

awk 'NR==FNR{a[$1]};NR!=FNR {if($1 in a) print $0}' tmp_bitkeys 3_simple
关于NR和FNR的介绍见：
http://lxw1234.com/archives/2016/03/621.htm




addr.out:
A
B
C

cs.out:
A;1
B;3
A;2
B;4
C;2
B;5

实现group by功能:
awk -F";" 'NR==FNR{a[$1]=0};NR!=FNR{if($1 in a){a[$1]+=$2}}; END{for(i in a){print i,a[i]}}' addr.out cs.out

结果为:
A 3
B 12
C 2

awk分组求和: 

awk -F";" '{x[$3]+=$4} END{for (i in x) print i,x[i]}' cs.out  > res.out

参考：

https://www.cnblogs.com/hider/p/11834706.html