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system admin cheatsheet
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| * filter and count IPs | |
| ```shell | |
| grep -F 'SLEEP%285%29' /var/log/nginx/www.letsface.cn/access_www.letsface.cn.log | grep -F '26/May/' | awk '{print $1}' | sort | uniq -c | sort -nr | |
| ``` |
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| sudo su - node |
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