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Linuxユーザーの追加・確認・削除

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###現在ログインしているユーザーの確認
下記3つのうちどれか。

$ echo $USER
$ who
$ users

###ユーザー一覧の確認

$ cut -d: -f1 /etc/passwd

ユーザー名が分かっている場合はgrepしてあげる。

$ cut -d: -f1 /etc/passwd | grep hoge

###ユーザーを新規追加

ユーザーの登録

$ useradd testuser

ユーザーが登録されているかの確認

$ cat /etc/passwd | grep testuser

# testuser:x:1000:1000::/home/testuser:/bin/bash

###ユーザーにパスワードを設定

$ sudo passwd testuser

###ユーザーの削除

※ホームディレクトリ配下のユーザーディレクトリも削除する場合は-rオプションが必要。

$ sudo userdel -r testuser
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