1、将1至4各重复3次, shell双循环实现
root@ubuntu01:/home/test2# ls root@ubuntu01:/home/test2# for i in `seq 4`; do for j in `seq 3`; do echo $i >> num.txt; done; done ## 双循环直接实现 root@ubuntu01:/home/test2# ls num.txt root@ubuntu01:/home/test2# cat num.txt 1 1 1 2 2 2 3 3 3 4 4 4