LINUX用户和组小练习

1.创建一个用户mandriva,其ID号为2002，基本组为distro(组ID为3003)，附加组为linux

[root@localhost ~] # groupadd -g 3003 distro [root@localhost ~] # tail -1 /etc/group distro:x:3003: [root@localhost ~] # groupadd linux [root@localhost ~] # tail -1 /etc/group linux:x:3004:

[root@localhost ~] # useradd -u 2002 -g distro -G linux mandriva [root@localhost ~] # id mandriva uid=2002(mandriva) gid=3003(distro) groups =3003(distro),3004(linux) context=root:system_r:unconfined_t:SystemLow-SystemHigh

2.创建一个用户fedora,其全名为Fedora Community,默认shell为tcsh

[root@localhost ~] # useradd -c "Fedora Commnuity" -s /bin/tcsh fedora [root@localhost ~] # id fedora uid=2003(fedora) gid=2003(fedora) groups =2003(fedora) context=root:system_r:unconfined_t:SystemLow-SystemHigh [root@localhost ~] # finger fedora Login: fedora Name: Fedora Commnuity Directory: /home/fedora Shell: /bin/tcsh Never logged in . No mail. No Plan. [root@localhost ~] #

3.修改mandriva的ID号为4004，基本组为linux,附加组为distro和fedora

[root@localhost ~] # usermod -u 4004 -g linux -G distro,fedora mandriva [root@localhost ~] # id mandriva uid=4004(mandriva) gid=3004(linux) groups =3004(linux),3003(distro),2003(fedora) context=root:system_r:unconfined_t:SystemLow-SystemHigh

4.给fedora加密码，并设定其密码最短使用期限为2天，最长为50天。

[root@localhost ~] # passwd fedora Changing password for user fedora. New UNIX password: BAD PASSWORD: it is WAY too short Retype new UNIX password: passwd : all authentication tokens updated successfully. [root@localhost ~] # passwd -n 2 -x 50 fedora Adjusting aging data for user fedora. passwd : Success [root@localhost ~] #

5.将mandriva的默认shell改为/bin/bash

[root@localhost ~] # usermod -s /bin/bash mandriva [root@localhost ~] # id mandriva uid=4004(mandriva) gid=3004(linux) groups =3004(linux),3003(distro),2003(fedora) context=root:system_r:unconfined_t:SystemLow-SystemHigh [root@localhost ~] # finger mandriva Login: mandriva Name: (null) Directory: /home/mandriva Shell: /bin/bash Never logged in . No mail. No Plan. [root@localhost ~] #

6.添加系统用户hbase,且不允许其登陆系统。

[root@localhost ~] # useradd -r -s /bin/nologin hbase [root@localhost ~] # tail -1 /etc/passwd hbase:x:102:103:: /home/hbase : /bin/nologin [root@localhost ~] # su - hbase su : warning: cannot change directory to /home/hbase : No such file or directory su : /bin/nologin : No such file or directory [root@localhost ~] #

本文转自zfz_linux_boy 51CTO博客，原文链接：http://blog.51cto.com/zhangfengzhe/1412871，如需转载请自行联系原作者