Centos下添加用户到用户组

将一个用户添加到用户组中，千万不能直接用： usermod -G groupA

这样做会使你离开其他用户组，仅仅做为 这个用户组 groupA 的成员。 应该用 加上 -a 选项： usermod -a -G groupA user

(FC4: usermod -G groupA,groupB,groupC user) -a 代表 append， 也就是 将自己添加到 用户组groupA 中，而不必离开 其他用户组。

命令的所有的选项，及其含义： Options: -c, –comment COMMENT new value of the GECOS field -d, –home HOME_DIR new home directory for the user account -e, –expiredate EXPIRE_DATE set account expiration date to EXPIRE_DATE -f, –inactive INACTIVE set password inactive after expiration to INACTIVE -g, –gid GROUP force use GROUP as new primary group -G, –groups GROUPS new list of supplementary GROUPS -a, –append append the user to the supplemental GROUPS mentioned by the -G option without removing him/her from other groups -h, –help display this help message and exit -l, –login NEW_LOGIN new value of the login name -L, –lock lock the user account -m, –move-home move contents of the home directory to the new location (use only with -d) -o, –non-unique allow using duplicate (non-unique) UID -p, –password PASSWORD use encrypted password for the new password -s, —shell SHELL new login shell for the user account -u, –uid UID new UID for the user account -U, –unlock unlock the user account

查看用户所属的组使用命令：$ groups user

或者查看文件：$ cat /etc/group

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