【linux学习笔记】 sort

1.对用冒号：分隔的第二列升序排序：

Sort a colon delimited text file on 2nd field (employee_id):

$ sort -t: -k 2 employee.txt 

2.对IP地址排序：

参考1：http://cosy.univ-reims.fr/~bhaggar/doc/Linux-101-Hacks.pdf

参考2：http://www.madboa.com/geek/sort-addr/

 fields set apart from the others by a dot (-t .). Sort first by the first field, and only the first field (-k 1,1), then by the second and only the second (-k 2,2), and so on (-k 3,3 -k 4,4).”