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                # useradd 創建用戶 **作用**:`useradd` 命令用于創建一個新的用戶帳號信息 **語法**: ``` useradd [-d home] [-s shell] [-c comment] [-m [-k template]] [-f inactive] [-e expire ] [-p passwd] [-r] username ``` **選項**: * `-c`:加上備注文字,備注文字保存在`/etc/passwd`的備注字段中 * `-d`:指定用戶登入時的家目錄,替換系統默認值`/home/<name>` * `-e`:指定賬號的失效日期,日期格式為`MM/DD/YY`,例如`11/16/20`。缺省表示永久有效 * `-f`:指定在密碼過期后多少天即關閉該賬號。如果為`0`賬號立即被停用;如果為`-1`則賬號一直可用。默認值為`-1` * `-g`:指定用戶所屬的群組。值可以使組名也可以是`GID`。用戶組必須已經存在的,期默認值為`100`,即`users` * `-G`:指定用戶所屬的附加群組 **參數**: * `username` 需要創建的用戶名 **示例**: 創建一個新用戶賬戶testuser1,并設置UID為544,主目錄為/usr/testuser1,屬于users組: ``` #useradd -u 544 -d /usr/testuser1? -g users -m? testuser1 ``` 新創建一個oracle用戶,這初始屬于oinstall組,且同時讓他也屬于dba組: ``` #useradd oracle -g oinstall -G dba ``` 創建一個系統用戶: ~~~ # useradd -r Howie ~~~
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