paste [-s] [-d " "] [file1] [file2] -s:将文件合并成行 -d:显示时的分割符
//1.txt 1 6 2 7 3 8 4 9 5 10 //2.txt a f b g c f d i e j
paste -d " " 1.txt 2.txt
paster -s -d " " 1.txt 2.txt