Shell中for循环的几个常用写法

第一类：数字性循环
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for1-1.sh

 #!/bin/bash

 for((i=;i<=;i++));
 do
 echo $(expr $i \*  + );
 done

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for1-2.sh

#!/bin/bash

for i in $(seq  )
do
echo $(expr $i \*  + );

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for1-3.sh

#!/bin/bash

for i in {..}
do
echo $(expr $i \*  + );
done

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for1-4.sh

#!/bin/bash

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

第二类：字符性循环
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for2-1.sh

#!/bin/bash

list="rootfs usr data data2"
for i in $list;
do
echo $i is appoint ;
done

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for2-2.sh

#!/bin/bash

for i in $* ;
do
echo $i is input chart\! ;
done

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for2-3.sh

#!/bin/bash

for i in f1 f2 f3 ;
do
echo $i is appoint ;
done

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for2-4.sh

#!/bin/bash

list="rootfs usr data data2"
for i in $list;
do
echo $i is appoint ;
done

第三类：路径查找
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for3-1.sh

#!/bin/bash

for file in /proc/*;
do
echo $file is file path \! ;
done

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for3-2.sh

#!/bin/bash

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