1 方法1
 
 1.1 简单打印元素
 
 #!/bin/bash
 
 for i in a b c d e f
 
         do
 
                 echo "the elment is $i"
 
         done
 
 
 1.2 批量解压文件
 
 #!/bin/bash
 
 dir=/home/shell_study3
 
 tmpdir="$dir/tmp/"
 
 cd $dir
 
 
 ls *.log.tar.gz > ls.log
 
 for i in $(cat ls.log)
 
 
 do
 
 
 tar -zxvf $i -C $tmpdir &>/dev/null
 
 
 done
 
 rm -rf ls.log
 
 echo 'ok'
 
 
 2 方法2
 
 #!/bin/bash
 
 sum=0
 
 for ((i=1;i<=100;i++))
 
 
 do
 
 
 sum=$(($sum+$i))
 
 
 done
 
 echo "the sum is $sum"
 
 
                
        
 
    
 
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