awk && sed (4) ====linux The Three Musketeers of the awk command

Http://www.cnblogs.com/ginvip/p/6352157.html

This is a blog I found, the content of awk is written very well, need to see

awk about! No.

(1) Take odd lines

[[email protected] shell]# SEQ 10 | awk ' I=!i '

1

3

5

7

9

(2) Take even lines

[[email protected] shell]# SEQ 10 | awk '! (i=!i) '

2

4

6

8

10

(3) SEQ 10 not after 4 lines

[[email protected] shell]# SEQ 10 | Head-n-4

1

2

3

4

5

6

This article is from the "It Life" blog, so be sure to keep this source http://dingxue.blog.51cto.com/12290895/1974369

awk && sed (4) ====linux The Three Musketeers of the awk command