shell 终端打印

```
printf "%-5s %-10s %-4s \n" NO Name Mark
printf "%-5s %-10s %-4s \n" 1 kael 100
printf "%-5s %-10s %-4s \n" 2 linda 99
printf "%-5s %-10s %-4s \n" 3 rouse 98

// 打印结果
NO    Name       Mark 
1     kael       100  
2     linda      99   
3     rouse      98  
```

printf 行尾 默认自带换行 \n

• %-5s : 左对齐，宽度为5的字符串替换；默认右对齐
• %-4.2f:指定保留2位小数