第一類：數字性循環
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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
#!/bin/bash for i in $(seq 1 10) do echo $(expr $i \* 3 + 1);
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for1-3.sh
#!/bin/bash for i in {1..10} do echo $(expr $i \* 3 + 1); done
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for1-4.sh
#!/bin/bash awk 'BEGIN{for(i=1; i<=10; i++) print i}'
第二類：字符性循環
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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
第三類：路徑查找
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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