[사용자 추가]

$ sudo useradd -d <home directory> -G admin -m -s /bin/bash <username>

$ sudo passwd <username>


<ex>

$ sudo useradd -m -s /bin/bash developer

$ sudo passwd developer


---------------------------------------------------------------------------------

Usage: useradd [options] LOGIN


Options:

  -b, --base-dir BASE_DIR       base directory for the home directory of the

                                new account

  -c, --comment COMMENT         GECOS field of the new account

  -d, --home-dir HOME_DIR       home directory of the new account

  -D, --defaults                print or change default useradd configuration

  -e, --expiredate EXPIRE_DATE  expiration date of the new account

  -f, --inactive INACTIVE       password inactivity period of the new account

  -g, --gid GROUP               name or ID of the primary group of the new

                                account

  -G, --groups GROUPS           list of supplementary groups of the new

                                account

  -h, --help                    display this help message and exit

  -k, --skel SKEL_DIR           use this alternative skeleton directory

  -K, --key KEY=VALUE           override /etc/login.defs defaults

  -l, --no-log-init             do not add the user to the lastlog and

                                faillog databases

  -m, --create-home             create the user's home directory

  -M, --no-create-home          do not create the user's home directory

  -N, --no-user-group           do not create a group with the same name as

                                the user

  -o, --non-unique              allow to create users with duplicate

                                (non-unique) UID

  -p, --password PASSWORD       encrypted password of the new account

  -r, --system                  create a system account

  -s, --shell SHELL             login shell of the new account

  -u, --uid UID                 user ID of the new account

  -U, --user-group              create a group with the same name as the user

  -Z, --selinux-user SEUSER     use a specific SEUSER for the SELinux user mapping



[유저삭제]

$ sudo deluser <username>


[홈디렉토리까지 모두 삭제]

$ sudo deluser --remove-home <username>


[홈디렉토리와 <username> 계정의 모든 파일을 완전히 삭제]

$ sudo deluser --remove-all-files <username>


[현재의 쉘 확인]

$ env | grep SHELL

SHELL=/bin/bash


[사용할수 있는 쉘 목록]

$ cat /etc/shells

# /etc/shells: valid login shells

/bin/sh

/bin/dash

/bin/bash

/bin/rbash


[쉘 바꾸기]

$ chsh

암호: 

<username>의 로그인 쉘을 변경하고 있습니다

새로운 값을 넣거나, 기본값을 원하시면 엔터를 치세요

로그인 쉘 [/bin/bash]: /bin/dash