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그룹에 사용자를 추가하십시오.

사용자 이름이 chyingpcasper 인 두 명의 사용자가 있고 이들 모두를 그룹 root 에 추가하려고한다고 가정 해 보겠습니다.

usermod chyingp -a -G root
usermod casper -a -G root

여기에 -a , -G 대한 설명이 나온다.

-a, --append
Add the user to the supplementary group(s). Use only with the -G option.
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
A list of supplementary groups which the user is also a member of. Each group is separated from the next by
a comma, with no intervening whitespace. The groups are subject to the same restrictions as the group given
with the -g option.

If the user is currently a member of a group which is not listed, the user will be removed from the group.
This behaviour can be changed via the -a option, which appends the user to the current supplementary group
list.


Modified text is an extract of the original Stack Overflow Documentation
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