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Linux.md
@@ -689,9 +689,21 @@ SELinux 全称 Security Enhanced Linux (安全强化 Linux)
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关闭反向解析
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```bash
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-# vim /etc/ssh/sshd_config
+vim /etc/ssh/sshd_config
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```
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设置 UseDNS no
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-# service sshd restart
+service sshd restart
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+```
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+
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+## at
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+定时任务
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+```bash
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+echo `date`
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+at now + 1 minute <<< "/bin/echo `date` > /tmp/time.log"
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+at now + 10 minutes <<< "/bin/echo `date` > /tmp/time.log" # 创建任务
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+at -l # 列出任务
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+at -c 1 # 显示任务内容
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