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[笔记] awk命令计算sum, min, max, avg
source link: https://blog.csdn.net/yanxiangtianji/article/details/78014882
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[笔记] awk命令计算sum, min, max, avg
yanxiangtianji
2017-09-18 00:10:13
1544
1544
awk 'BEGIN{max=0;min=9e9}{FS=" "}{x+=$5;if($5>max){max=$5}else if($5<min){min=$5}}END{print x,"\t",max,"\t",min,"\t",x/NR}'讲解：
1. FS指定间隔符 （每一段用$x引用，编号从1开始)
2. BEGIN和END后面为一次性命令，中间的主体部分对每一行执行
3. 类似c语法，各段使用{}包裹，语句使用;分隔
4. NR为number of records，即行数，NF为number of fields，即当前行被分割了多少段，FNR为file number of records，即当前文件内的行数；$NF表示最后一个field的值。
上面代码分解为：
awk 'BEGIN{max=0;min=9e9}
{FS=" "}
{
x+=$5;
if($5>max){max=$5}
else if($5<min){min=$5}
}
END{print x,"\t",max,"\t",min,"\t",x/NR}'Recommend
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