版權宣告：本文為CSDN博主「BabyFish13」的原創文章，遵循CC 4.0 BY-SA版權協議，轉載請附上原文出處連結及本宣告。
原文連結：https://blog.csdn.net/babyfish13/article/details/52981110

轉載用於收藏學習

第一類：數字性迴圈
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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

-----------------------------
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}'  

第二類：字元性迴圈

1 #!/bin/bash
2 
3 for i in `ls`;
4 do
5 echo $i is file name\! ;
6 done

-----------------------------
for2-2.sh

1 #!/bin/bash
2 
3 for i in $* ;
4 do
5 echo $i is input chart\! ;
6 done

-----------------------------
for2-3.sh

1 #!/bin/bash
2 
3 for i in f1 f2 f3 ;
 
4 do
5 echo $i is appoint ;
6 done

-----------------------------

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

第三類：路徑查詢
-----------------------------
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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