53 lines
1.1 KiB
Markdown
53 lines
1.1 KiB
Markdown
### 语法结构
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- 多重匹配语句
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- 如果匹配成功，执行相匹配的命令
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```
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pattern 表示需要匹配的模式
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case var in
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pattern 1) # 可以用 | 分割多个模式，相当于 or
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command 1 # 需要执行的语句
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;; # 两个分号代表命令结束
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pattern 2)
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command 2
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;;
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*) # default 不满足以上模式，默认执行下边的语句
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command 3
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;;
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esac
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```
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```
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#! /bin/env bash
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case $1 in
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start|S)
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echo "service starting"
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;;
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stop|T)
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echo "service stopping"
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;;
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reload|R)
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echo "service restarting"
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;;
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*)
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echo "invalid params: $1"
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;;
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esac
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```
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```
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh
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invalid params:
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh 2
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invalid params: 2
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh start
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service starting
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh S
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service starting
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh reload
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service restarting
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me@me-EQ59:~/shell_demo/scripts/shell03$ ./case_1.sh T
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service stopping
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me@me-EQ59:~/shell_demo/scripts/shell03$
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``` |