32 lines
520 B
Markdown
32 lines
520 B
Markdown
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- 条件为真就进入循环，条件为假就退出循环
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- 语法结构
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```shell
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while 表达式
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do
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command
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done
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```
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- 与read结合读取文件
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```
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me@me-EQ59:~/shell_demo/scripts/shell02$ ./while_read.sh
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10.0.0.1
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123
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10.0.0.2
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124
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10.0.0.3
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125
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me@me-EQ59:~/shell_demo/scripts/shell02$ cat while_read.sh
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#! /bin/env bash
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while read ip pass
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do
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echo $ip
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echo $pass
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done < ip.txt
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me@me-EQ59:~/shell_demo/scripts/shell02$ cat ip.txt
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10.0.0.1 123
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10.0.0.2 124
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10.0.0.3 125
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me@me-EQ59:~/shell_demo/scripts/shell02$
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```
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