bash 用户是否在拨出组中？
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Is user in dialout group?
提问by Jesse_Pinkman
In my script I need to find out whether user is in dialout group and if he is not, add him to the group. I have found out how to add him but is there a way how to know if he is in the group ?
在我的脚本中，我需要找出用户是否在拨出组中，如果他不在，则将他添加到组中。我已经找到了添加他的方法，但是有没有办法知道他是否在组中？
采纳答案by heemayl
You can do this in both ways:
您可以通过两种方式执行此操作：
Check all groups a specific user is member of and check if
dialoutis there:id usernameOr as Wolf said already:
groups usernameCheck all members of the specific group (
dialout) and check if the user is in the list:getent group dialout
检查特定用户所属的所有组并检查是否
dialout存在：id username或者正如沃尔夫已经说过的那样：
groups username检查特定组 (
dialout) 的所有成员并检查用户是否在列表中：getent group dialout
回答by Wolf
You are looking for the groupscommand. Here's an example of me using it on a server I just happened to be talking to at the moment (I'm logged in as the lproduser):
您正在寻找groups命令。这是我在当时碰巧与之交谈的服务器上使用它的示例（我以lprod用户身份登录）：
[lprod@milazgit01 ~] $ groups wolf
wolf : prod tools
Then you can compare that to a regular expression in whatever shell you are using.
然后，您可以将其与正在使用的任何 shell 中的正则表达式进行比较。
