Shell Shell 中 for 循环的几个常用写法

laofo · 发布于 2017年6月08日 · 177 次阅读
4

Shell中for循环的几个常用写法

第一类:数字性循环

for1-1.sh [html] view plain copy print? #!/bin/bash

for((i=1;i<=10;i++));
do
echo $(expr $i * 3 + 1);
done


for1-2.sh [html] view plain copy print? #!/bin/bash

for i in $(seq 1 10)
do
echo $(expr $i * 3 + 1);
done


for1-3.sh [html] view plain copy print? #!/bin/bash

for i in {1..10}
do
echo $(expr $i * 3 + 1);
done


for1-4.sh [html] view plain copy print? #!/bin/bash

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

第二类:字符性循环

for2-1.sh [html] view plain copy print? #!/bin/bash

for i in ls;
do
echo $i is file name! ;
done


for2-2.sh [html] view plain copy print? #!/bin/bash

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


for2-3.sh [html] view plain copy print? #!/bin/bash

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


for2-4.sh [html] view plain copy print? #!/bin/bash

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

第三类:路径查找

for3-1.sh [html] view plain copy print? #!/bin/bash

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


for3-2.sh [html] view plain copy print? #!/bin/bash

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

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