Shell中for迴圈的幾個常用寫法
阿新 • • 發佈:2019-01-02
第一類:數字性迴圈
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for1-1.sh
#!/bin/bash
for((i=1;i<=10;i++));
do
echo $(expr $i \* 3 + 1);
done
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for1-2.sh
#!/bin/bash
for i in $(seq 1 10)
do
echo $(expr $i \* 3 + 1);
done
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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:字元性迴圈
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for2-1.sh
#!/bin/bash
for i in `ls`;
do
echo $i is file name\! ;
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:路徑查詢
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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