操作系统技术,云计算应用

Linux添加用户(user)到用户组(group)

http://blog.csdn.net/pursue168/article/details/6443046

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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