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                # at 創建一次性定時任務 **作用**:`at` 類似打印進程,會把任務放到/var/spool/at目錄中,到指定時間運行它 。at命令相當于另一個shell,運行at time命令時,它發送一個個命令,可以輸入任意命令或者程序。 **語法**: ``` at [-q x] [-f file] [-mldbv] time at -c job ... atq [-q x] ``` **選項**: * `-A`:列出所有的進程 * `-f`:指定執行文件 **參數:** * `file`:執行文件 * `time`: 執行時間 **示例**: 5分鐘后執行: ~~~ # at now +5min ~~~ 第4天中午 ~~~ # at noon +4 days ~~~ 2021-03-05 02:00 ~~~ # at 2:00 2021-03-05 ~~~
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