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端末コードを解読しようとしています

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端末コードを解読しようとしています

-aと はどういう-G意味ですか? ありがとうございます。

sudo usermod -a -G www-data username

答え1

からman usermod：

   -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.

つまり、ユーザーをグループにsudo usermod -aG www-data username追加します。usernamewww-data

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