10_01-04 User & Group Administration - 사용자 관리 (usermod)

usermod 명령어

∇ 명령어 형식

# usermod [options] LOGIN

[root@server1 ~]# usermod [options] LOGIN
Usage: usermod [options] LOGIN

Options:
  -c, --comment COMMENT         new value of the GECOS field
  -d, --home HOME_DIR           new home directory for the user account
  -e, --expiredate EXPIRE_DATE  set account expiration date to EXPIRE_DATE
  -f, --inactive INACTIVE       set password inactive after expiration
                                to INACTIVE
  -g, --gid GROUP               force use GROUP as new primary group
  -G, --groups GROUPS           new list of supplementary GROUPS
  -a, --append                  append the user to the supplemental GROUPS
                                mentioned by the -G option without removing
                                the user from other groups
  -h, --help                    display this help message and exit
  -l, --login NEW_LOGIN         new value of the login name
  -L, --lock                    lock the user account
  -m, --move-home               move contents of the home directory to the
                                new location (use only with -d)
  -o, --non-unique              allow using duplicate (non-unique) UID
  -p, --password PASSWORD       use encrypted password for the new password
  -R, --root CHROOT_DIR         directory to chroot into
  -P, --prefix PREFIX_DIR       prefix directory where are located the /etc/* files
  -s, --shell SHELL             new login shell for the user account
  -u, --uid UID                 new UID for the user account
  -U, --unlock                  unlock the user account
  -v, --add-subuids FIRST-LAST  add range of subordinate uids
  -V, --del-subuids FIRST-LAST  remove range of subordinate uids
  -w, --add-subgids FIRST-LAST  add range of subordinate gids
  -W, --del-subgids FIRST-LAST  remove range of subordinate gids
  -Z, --selinux-user SEUSER     new SELinux user mapping for the user account

 

∇ 명령어 사용예

# usermod -u 2000 user01

# usermod -s /bin/sh user01

# usermod -g 10 -c " Test Group" user01

# usermod -l user03 -d /home/user03 -m user01    (-l : login name, -m : move directory)

 

∇ /etc/ passwd 형식

user01:x:1004:1004:Test User:/home/user01:/bin/bash

   -l         -u   -g       -c            -d              -s

 

 

2_2_1 user01 사용자 정보 변경

# grep user01 /etc/passwd

user01:x:1001:1001::/home/user01:/bin/bash

[root@server1 ~]# grep user01 /etc/passwd
user01:x:1001:1001::/home/user01:/bin/bash

 

# usermod -u 2000 user01

# grep user01 /etc/passwd

user01:x:2000:1001::/home/user01:/bin/bash

[root@server1 ~]# usermod -u 2000 user01

[root@server1 ~]# grep user01 /etc/passwd
user01:x:2000:1001::/home/user01:/bin/bash

: 사용자ID가 변경된 것을 확인 할 수 있음

 

# cat /etc/shells

: 쉘의 종류 확인

[root@server1 ~]# cat /etc/shells
/bin/sh
/bin/bash
/usr/bin/sh
/usr/bin/bash

 

# usermod -s /bin/sh user01   

# grep user01 /etc/passwd

user01:x:2000:1001::/home/user01:/bin/sh

[root@server1 ~]# usermod -s /bin/sh user01

[root@server1 ~]# grep user01 /etc/passwd
user01:x:2000:1001::/home/user01:/bin/sh

: 로그인 쉘이 변경된 것을 확인할 수 있음