1、测试数据
[root@centos7 test2]# cat a.txt
e d g e
s d g w
a x d g
n d i d
2、将第三列替换为xxx
[root@centos7 test2]# cat a.txt
e d g e
s d g w
a x d g
n d i d
[root@centos7 test2]# awk ‘{$3 = "xxx"; print $0}‘ a.txt
e d xxx e
s d xxx w
a x xxx g
n d xxx d
3、同时替换多列
[root@centos7 test2]# cat a.txt
e d g e
s d g w
a x d g
n d i d
[root@centos7 test2]# awk ‘{$1 = "aa"; $4 = "bb"; print $0}‘ a.txt
aa d g bb
aa d g bb
aa x d bb
aa d i bb