#usermod

[linuxtechlab]

How to rename user in Linux (also rename group & home directory)

We might have come across a situation where we might want to rename user in Linux system, for whatever reasons. We can easily rename user in Linux & also we can rename the home directory or its UID as well.

In this short tutorial, we will be discussing these things only. Let’s start by renaming user in Linux first,

(Recommended Read: How to use FIND command to locate anything in Linux)

 Rename…

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[kchiu]

Prepare Oracle Linux 7.1 for Oracle Database 12c installation

Unix group

# cat /etc/group

... oracle:x:1000:oracle

Install oracle-rdbms-server-12cR1-preinstall

# yum install oracle-rdbms-server-12cR1-preinstall -y

Loaded plugins: langpacks Resolving Dependencies --> Running transaction check ---> Package oracle-rdbms-server-12cR1-preinstall.x86_64 0:1.0-3.el7 will be installed --> Processing Dependency: gcc-c++ for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Processing Dependency: compat-libcap1 for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Processing Dependency: ksh for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Processing Dependency: libaio-devel for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Processing Dependency: compat-libstdc++-33 for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Processing Dependency: libstdc++-devel for package: oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64 --> Running transaction check ---> Package compat-libcap1.x86_64 0:1.10-7.el7 will be installed ---> Package compat-libstdc++-33.x86_64 0:3.2.3-72.el7 will be installed ---> Package gcc-c++.x86_64 0:4.8.3-9.el7 will be installed ---> Package ksh.x86_64 0:20120801-22.el7_1.2 will be installed ---> Package libaio-devel.x86_64 0:0.3.109-12.el7 will be installed ---> Package libstdc++-devel.x86_64 0:4.8.3-9.el7 will be installed --> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================================================== Package                                              Arch                   Version                               Repository                  Size ==================================================================================================================================================== Installing: oracle-rdbms-server-12cR1-preinstall                 x86_64                 1.0-3.el7                             ol7_latest                  17 k Installing for dependencies: compat-libcap1                                       x86_64                 1.10-7.el7                            ol7_latest                  17 k compat-libstdc++-33                                  x86_64                 3.2.3-72.el7                          ol7_latest                 190 k gcc-c++                                              x86_64                 4.8.3-9.el7                           ol7_latest                 7.2 M ksh                                                  x86_64                 20120801-22.el7_1.2                   ol7_latest                 880 k libaio-devel                                         x86_64                 0.3.109-12.el7                        ol7_latest                  12 k libstdc++-devel                                      x86_64                 4.8.3-9.el7                           ol7_latest                 1.5 M

Transaction Summary ==================================================================================================================================================== Install  1 Package (+6 Dependent packages)

Total download size: 9.8 M Installed size: 29 M Downloading packages: (1/7): compat-libcap1-1.10-7.el7.x86_64.rpm                                                                                  |  17 kB  00:00:00     (2/7): compat-libstdc++-33-3.2.3-72.el7.x86_64.rpm                                                                           | 190 kB  00:00:00     (3/7): ksh-20120801-22.el7_1.2.x86_64.rpm                                                                                    | 880 kB  00:00:00     (4/7): libaio-devel-0.3.109-12.el7.x86_64.rpm                                                                                |  12 kB  00:00:00     (5/7): libstdc++-devel-4.8.3-9.el7.x86_64.rpm                                                                                | 1.5 MB  00:00:01     (6/7): oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64.rpm                                                             |  17 kB  00:00:00     (7/7): gcc-c++-4.8.3-9.el7.x86_64.rpm                                                                                        | 7.2 MB  00:00:03     ---------------------------------------------------------------------------------------------------------------------------------------------------- Total                                                                                                               2.2 MB/s | 9.8 MB  00:00:04     Running transaction check Running transaction test Transaction test succeeded Running transaction  Installing : libstdc++-devel-4.8.3-9.el7.x86_64                                                                                               1/7  Installing : gcc-c++-4.8.3-9.el7.x86_64                                                                                                       2/7  Installing : libaio-devel-0.3.109-12.el7.x86_64                                                                                               3/7  Installing : compat-libcap1-1.10-7.el7.x86_64                                                                                                 4/7  Installing : ksh-20120801-22.el7_1.2.x86_64                                                                                                   5/7  Installing : compat-libstdc++-33-3.2.3-72.el7.x86_64                                                                                          6/7  Installing : oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64                                                                            7/7  Verifying  : gcc-c++-4.8.3-9.el7.x86_64                                                                                                       1/7  Verifying  : compat-libstdc++-33-3.2.3-72.el7.x86_64                                                                                          2/7  Verifying  : ksh-20120801-22.el7_1.2.x86_64                                                                                                   3/7  Verifying  : compat-libcap1-1.10-7.el7.x86_64                                                                                                 4/7  Verifying  : libaio-devel-0.3.109-12.el7.x86_64                                                                                               5/7  Verifying  : oracle-rdbms-server-12cR1-preinstall-1.0-3.el7.x86_64                                                                            6/7  Verifying  : libstdc++-devel-4.8.3-9.el7.x86_64                                                                                               7/7

Installed:  oracle-rdbms-server-12cR1-preinstall.x86_64 0:1.0-3.el7                                                                                          

Dependency Installed:  compat-libcap1.x86_64 0:1.10-7.el7    compat-libstdc++-33.x86_64 0:3.2.3-72.el7  gcc-c++.x86_64 0:4.8.3-9.el7  ksh.x86_64 0:20120801-22.el7_1.2  libaio-devel.x86_64 0:0.3.109-12.el7  libstdc++-devel.x86_64 0:4.8.3-9.el7      

Complete!

Unix groups after

# cat /etc/group

... oracle:x:1000:oracle oinstall:x:54321: dba:x:54322:

Assign groups to oracle user

# groupadd -g 54323 oper # usermod -g oinstall oracle # usermod -a -G oinstall,dba,oper oracle # id oracle uid=1000(oracle) gid=1000(oinstall) groups=1000(oinstall),10(wheel),1001(dba),1002(oper),1003(oracle)

[goodanswerbiz]

Fixed: Default groups assigned to the first user in Ubuntu Server 8.04? #answer #programming #fix

Fixed: Default groups assigned to the first user in Ubuntu Server 8.04? #answer #programming #fix

Default groups assigned to the first user in Ubuntu Server 8.04?

I just made a silly mistake on my Ubuntu Server box: I added myself to a group using usermod -G, after which I discovered the -a option…

The result is that I am now out of the admingroup, and lost my sudo rights. I can sort that out, but I want to know what other groups I may been removed from? My user was the first one so what I’m…

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[sevennet-blog]

Fix: Default groups assigned to the first user in Ubuntu Server 8.04? #programming #development #computers

Fix: Default groups assigned to the first user in Ubuntu Server 8.04? #programming #development #computers

Default groups assigned to the first user in Ubuntu Server 8.04?

I just made a silly mistake on my Ubuntu Server box: I added myself to a group using usermod -G, after which I discovered the -a option…

The result is that I am now out of the admingroup, and lost my sudo rights. I can sort that out, but I want to know what other groups I may been removed from? My user was the first one so what I’m…

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[gomuro]

команды usermod и chfn.

Для изменения учетной записи пользователя (account) используются команды usermod и chfn. Для смены имени пользователя вначале указывается новое имя, а затем старое:

# usermod -l user user1

Для изменения UID без изменения имени пользователя сначала указывается новый код UID, а затем имя:

# usermod -u 1100 user

Принадлежность пользователя к группам не изменяется и владельца crontab, почтовых каталогов, файлов в общих каталогах, временных файлов /tmp придется изменить вручную. Для поиска файлов можно воспользоваться командой find с указанием исходного кода UID :

# find /home/src -uid ****

Для смены владельца файлов используется команда chown:

# chown 1100 /home/src/xxkb-1.10/xxkb.c

Последовательная смена владельца для значительного количества файлов — весьма скучное занятие,но есть выход:

# find /home/src -uid **** -exec chown -v **** {} \;

Если заменить ключ -exec на -ok, то команда find будет запрашивать подтверждение каждого изменения Изменение пользовательских данных:

# chfn user

[theshank]

Debian / LMDE : how to add to vboxusers group

Open a terminal, and run:

sudo usermod -aG vboxusers username

where you replace username with your actual user name.

You can check with:

cat /etc/group | grep username

what groups your are member of.

[sys-log-blog-blog]

usermod: Appending to Additional Groups

This is one of those things that I found out the hard way long long ago.

When using the usermod command in Linux to add additional groups if you want to only list the new groups the user is in you must use the -aG flags rather than a simple -G.

When specifying -G by itself you are telling usermod to change the users additional groups to the groups specified and only those groups. The user will be removed from any other group. If you use -aG then the groups mentioned are appended and not removed.

Here are some examples:

[root@bcane ~]# id bcane uid=500(bcane) gid=500(bcane) groups=500(bcane),100(users)

My user has a primary group of bcane and an additional group of users

[root@bcane ~]# usermod -G wheel bcane [root@bcane ~]# id bcane uid=500(bcane) gid=500(bcane) groups=500(bcane),10(wheel)

My user now has a primary group of bcane and an additional group of wheel. It was removed from the users group via the usermod command.

[root@bcane ~]# usermod -aG users bcane [root@bcane ~]# id bcane uid=500(bcane) gid=500(bcane) groups=500(bcane),10(wheel),100(users)

Now my user is part of both the users and wheel group because I asked usermod to append the additional groups.

-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 -a option, which appends user to the current supplementary group list.