useradd 深入使用
1,查看帮助# useradd -huseradd: invalid option -- 'h'Usage: useradd LOGINOptions:-b, --base-dir BASE_DIR base directory for the home directory of the new account-c, --comment COMMENT GECOS field of the new account-d, --home-dir HOME_DIR home directory of the new account-D, --defaults print or change default useradd configuration-e, --expiredate EXPIRE_DATEexpiration date of the new account-f, --inactive INACTIVE password inactivity period of the new account-g, --gid GROUP name or ID of the primary group of the new account-G, --groups GROUPS list of supplementary groups of the new account-h, --help display this help message and exit-k, --skel SKEL_DIR use this alternative skeleton directory-K, --key KEY=VALUE override /etc/login.defs defaults-l, --no-log-init do not add the user to the lastlog and faillog databases-m, --create-home create the user's home directory-M, --no-create-home do not create the user's home directory-N, --no-user-group do not create a group with the same name as the user-o, --non-unique allow to create users with duplicate (non-unique) UID-p, --password PASSWORD encrypted password of the new account-r, --system create a system account-s, --shell SHELL login shell of the new account-u, --uid UID user ID of the new account-U, --user-group create a group with the same name as the user-Z, --selinux-user SEUSER use a specific SEUSER for the SELinux user mapping
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useradd [-u UID] [-g initial_group] [-G other_group] - [-c 说明栏] [-d home] [-s shell] username参数:-u:后面接的是 UID ,是一组数字。直接指定一个特定的 UID 给这个帐号;-g:后面接的那个群组名称就是我们上面提到的 initial group 啦~ 该 group ID (GID) 会被放置到 /etc/passwd 的第四个栏位内。-G:后面接的群组名称则是这个帐号还可以支援的群组。 这个参数会修改 /etc/group 内的相关资料喔!-M:强制!不要建立使用者家目录-m:强制!要建立使用者家目录!-c:这个就是 /etc/passwd 的第五栏的说明内容啦~可以随便我们设定的啦~-d:指定某个目录成为家目录,而不要使用预设值;-r:建立一个系统的帐号,这个帐号的 UID 会有限制 (/etc/login.defs)-s:后面接一个 shell ,预设是 /bin/bash 的啦~
2,实例
创建普通帐户
useradd fdfs
创建系统帐户
useradd fdfs -r
创建指定shell环境用户
userfdfs fdfs -s "/bin/sh"
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