awk命令之NF和$NF区别

NF(number of field)：域的个数

$NF ：最后一个Field(列)

/tmp/test>ll a
-rw-rw-r-- 1 admin admin 0 8月  11 10:58 a
/tmp/test>ll a |awk '{print NF}' 
9
/tmp/test>ll a |awk '{print $NF}'
a

https://www.cnblogs.com/xxiong1031/articles/7344804.html