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linux
[Cygwin] watch: command not found
[Linux] 使用 watch 定期執行指令
[Linux] 查詢發行版本與核心版本
[Ubuntu] 使用 Certbot 自動更新 Let's Encrypt 憑證
[Ubuntu] 使用 hostnamectl 修改主機名稱
[Ubuntu] 套件安裝錯誤: Could not get lock /var/lib/dpkg/lock / Unable to lock the administration directory (/var/lib/dpkg/)
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