$1 $2 $3,依次为第一个参数第二个参数，第三个参数
$@ 参数列表

#数值变遍历
#!/bin/bash 

for((i=1;i<=10;i++)); 
do 
    echo $i; 
done

#!/bin/bash 

for i in {1..10} 
do 
    echo $i
done

awk ‘BEGIN{for(i=1; i<=10; i++) print i}‘  

#列表遍历

#!/bin/bash  
list="aa bb cc dd"  
for i in $list;  
do  
    echo $i is appoint ;  
done  

# 命令结果遍历 $() ‘‘ 写执行命令

#!/bin/bash  
for i in `ls`;  
do   
    echo $i is file name\! ;  
done   

#!/bin/bash  
for file in $(ls *.sh)  
do  
echo $file is file path \! ;  
done