1、在所有行后添加空行
[root@centos79 test]# cat a.txt a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{print $0 " "}' a.txt a g r e i x k like a f g liker s t 2 a b d s i
2、
[root@centos79 test]# cat a.txt a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{if(NR%2 == 0){print $0 " "}else {print $0}}' a.txt ## 偶数后添加空行 a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{if(NR%2 == 0){print " "$0}else {print $0}}' a.txt ## 偶数前添加空行 a g r e i x k like a f g liker s t 2 a b d s i
3、
[root@centos79 test]# cat a.txt a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{if($0 ~ /f/){print $0 " "} else {print $0}}' a.txt ## 利用正则 a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{if($0 ~ /g/){print $0 " "} else {print $0}}' a.txt ## 利用正则 a g r e i x k like a f g liker s t 2 a b d s i
4、
[root@centos79 test]# cat a.txt a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk 'BEGIN{printf " "}{print $0}' a.txt ##行首添加空行 a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk '{print $0}END{printf " "}' a.txt ## 行尾添加空行 a g r e i x k like a f g liker s t 2 a b d s i [root@centos79 test]# awk 'BEGIN{printf " "}{print $0}END{printf " "}' a.txt ## 行首、行尾同时添加空行 a g r e i x k like a f g liker s t 2 a b d s i