Shulou(Shulou.com)06/03 Report--

1. Display / etc directory, starting with a non-letter, followed by a letter and other files or directories of any length and any character

[root@centos7 etc] # touch _ di234

[root@centos7 etc] # ls / etc/ | grep ^ [^ a-zA-Z] [a-zA-Z]. *

1sdf23

_ di234

[root@centos7 etc] #

2. Copy all files or directories that begin with p and end with non-numbers under the / etc directory to the / tmp/mytest1 directory.

[root@centos7 ~] # ls / etc/ | grep ^ p.* [^ 0-9] $

Pam.d

Passwd

Passwd-

Pbm2ppa.conf

Pinforc

Pki

Plymouth

Pm

Pnm2ppa.conf

3. Convert the contents of the / etc/issue file to uppercase and save to the / tmp/issue.out file

[root@centos7 ~] # cat / etc/issue | tr'amurz 'Amurz' > / tmp/mytest1

[root@centos7 ~] # cat / tmp/mytest1

\ s

KERNEL\ R ON AN\ M

[root@centos7 ~] #

4. Summarize and describe how to use user and group management commands and complete the following exercises:

(1) create a group distro with a GID of 2019

[root@centos7 ~] # groupadd-g 2019 distro

[root@centos7 ~] # cat / etc/group | grep distro

Distro:x:2019:

[root@centos7 ~] #

(2) create user mandriva, whose ID number is 1005; the basic group is distro

[root@centos7] # useradd-u 1005-g distro mandriva

[root@centos7 ~] # id mandriva

Uid=1005 (mandriva) gid=2019 (distro) groups=2019 (distro)

[root@centos7 ~] #

(3) create user mageia, whose ID number is 1100 and home directory is / homenux

[root@centos7] # useradd-u 1100-d / homenux mageia

[root@centos7 ~] # id mageia

Uid=1100 (mageia) gid=1100 (mageia) groups=1100 (mageia)

[root@centos7 ~] #

(4) add a password to the user mageia, the password is mageedu, and set the user password to expire after 7 days.

[root@centos7 ~] # echo mageedu | passwd-x 7-- stdin mageia

[root@centos7 ~] # cat / etc/shadow | grep mageia

Mageia:!!:18320:0:7:7:::

(5) delete mandriva, but keep its home directory

[root@centos7 ~] # userdel mandriva

[root@centos7] # ls-d / home/mandriva/

/ home/mandriva/

[root@centos7 ~] #

(6) create user slackware, whose ID number is 2002, basic group is distro, and additional group peguin

[root@centos7 ~] # groupadd peguin

[root@centos7] # useradd-u 2002-g distro-G peguin slackware

[root@centos7 ~] # id slackware

Uid=2002 (slackware) gid=2019 (distro) groups=2019 (distro), 2020 (peguin)

(7) modify the default shell of slackware to / bin/tcsh

[root@centos7] # usermod-s / bin/tcsh slackware

[root@centos7 ~] # grep slackware / etc/passwd

Slackware:x:2002:2019::/home/slackware:/bin/tcsh

[root@centos7 ~] #

(8) add additional group admins for user slackware

[root@centos7 ~] # groupadd admins

[root@centos7 ~] # usermod-G admins slackware

[root@centos7 ~] # id slackware

Uid=2002 (slackware) gid=2019 (distro) groups=2019 (distro), 2021 (admins)

[root@centos7 ~] #

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