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Update killall.md (jaywcjlove#364)
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command/killall.md

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@@ -33,10 +33,14 @@ killall(选项)(参数)
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### 实例
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杀死所有同名进程
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```shell
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# 杀死所有同名进程
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killall vi
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# 指定向进程发送的信号
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killall -9 vi
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# 0信号表示不向进程发送信号, 可通过返回值判断进程是否存在, 0(存在)1(不存在)
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killall -0 vi
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echo $?
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```
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