paste命令可以将2个文件合并成一个,中间用制表符隔开
[leo@leo ~]$ cat a
a b c
b c a
c a b
a a a
b b b
c c c
[leo@leo ~]$ cat b
a b c
b c a
c a b
1 1 1
2 2 2
3 3 3
[leo@leo ~]$ paste a b
a b c a b c
b c a b c a
c a b c a b
a a a 1 1 1
b b b 2 2 2
c c c 3 3 3