1、测试数据
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10
2、xargs
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10 [root@centos79 test]# cat a.txt | xargs 01 02 03 04 05 06 07 08 09 10
3、tr命令
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10 [root@centos79 test]# cat a.txt | tr " " " " | sed 's/.$/ /' 01 02 03 04 05 06 07 08 09 10
4、awk命令
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10 [root@centos79 test]# awk '{ORS = " "}{print} END {printf " "}' a.txt 01 02 03 04 05 06 07 08 09 10
5、awk命令
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10 [root@centos79 test]# awk '{printf("%s ", $0)} END {printf " "}' a.txt 01 02 03 04 05 06 07 08 09 10
6、sed
[root@centos79 test]# cat a.txt 01 02 03 04 05 06 07 08 09 10 [root@centos79 test]# sed ':a; N; s/ / /; ta' a.txt 01 02 03 04 05 06 07 08 09 10
验证：
[root@centos79 test]# cat a.txt s e t g i k z n c d w u [root@centos79 test]# cat a.txt | xargs s e t g i k z n c d w u [root@centos79 test]# cat a.txt | tr " " " " | sed 's/.$/ /' s e t g i k z n c d w u [root@centos79 test]# awk '{ORS = " "} {print} END {printf " "}' a.txt s e t g i k z n c d w u [root@centos79 test]# awk '{printf("%s ", $0)} END {printf " "}' a.txt s e t g i k z n c d w u [root@centos79 test]# sed ':a; N; s/ / /; ta' a.txt s e t g i k z n c d w u