Shell中for循环的几个常用写法
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原文链接：https://blog.csdn.net/babyfish13/article/details/52981110
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第一类：数字性循环
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for1-1.sh
1 #!/bin/bash
2
3 for((i=1;i<=10;i++));
4 do
5 echo $(expr $i \* 3 + 1);
6 done
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for1-2.sh
1 #!/bin/bash
2
3 for i in $(seq 1 10)
4 do
5 echo $(expr $i \* 3 + 1);
6 done
-----------------------------
for1-3.sh
1 #!/bin/bash
2
3 for i in {1..10}
4 do
5 echo $(expr $i \* 3 + 1);
6 done
-----------------------------
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
1 #!/bin/bash
2
3 for i in `ls`;
4 do
5 echo $i is file name\! ;
6 done
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for2-2.sh
1 #!/bin/bash
2
3 for i in $* ;
4 do
5 echo $i is input chart\! ;
6 done
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for2-3.sh
1 #!/bin/bash
2
3 for i in f1 f2 f3 ;
4 do
5 echo $i is appoint ;
6 done
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for2-4.sh
1 #!/bin/bash
2
3 list="rootfs usr data data2"
4 for i in $list;
5 do
6 echo $i is appoint ;
7 done
第三类：路径查找
-----------------------------
for3-1.sh
1 #!/bin/bash
2
3 for file in /proc/*;
4 do
5 echo $file is file path \! ;
6 done
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for3-2.sh
1 #!/bin/bash
2
3 for file in $(ls *.sh)
4 do
5 echo $file is file path \! ;
6 done
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