1、测试数据
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt ## 测试数据 a 3 5 d s g e z c g w k z c m d
2、xargs实现（数据大时不适用）
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt a 3 5 d s g e z c g w k z c m d root@PC1:/home/test2# cat test.txt | xargs a 3 5 d s g e z c g w k z c m d
3、tr + sed实现
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt a 3 5 d s g e z c g w k z c m d root@PC1:/home/test2# cat test.txt | tr "\n" " " | sed 's/$/\n/' a 3 5 d s g e z c g w k z c m d
4、awk实现
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt a 3 5 d s g e z c g w k z c m d root@PC1:/home/test2# awk 'BEGIN{RS = EOF}{gsub("\n"," ");print}' test.txt a 3 5 d s g e z c g w k z c m d
5、sed实现（速度慢）
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt a 3 5 d s g e z c g w k z c m d root@PC1:/home/test2# sed ':a; N; s/\n/ /; ta' test.txt a 3 5 d s g e z c g w k z c m d
6、awk实现
root@PC1:/home/test2# ls test.txt root@PC1:/home/test2# cat test.txt a 3 5 d s g e z c g w k z c m d root@PC1:/home/test2# awk '{printf("%s ", $0)}END{printf("\n")}' test.txt a 3 5 d s g e z c g w k z c m d