Linux file and example exercise of user management

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] # ls-d / etc/ [^ [: alpha:]] [: alpha:] *

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 etc] # mkdir / tmp/mytest1 & & cp-a / etc/ [p] * [^ [: digit:]] / tmp/mytest1/

[root@centos7 etc] # ls / tmp/mytest1/ # View the result

Pam.d passwd- pinforc plymouth pnm2ppa.conf postfix prelink.conf.d profile protocols purple

Passwd pbm2ppa.conf pki pm popt.d ppp printcap profile.d pulse python

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

[root@centos7 etc] # tr'a murz''Amurz'

< /etc/issue >

/ tmp/issue.out

[root@centos7 etc] # cat / tmp/issue.out View content

\ s

KERNEL\ R ON AN\ M

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 etc] # groupadd distro-g 2019

[root@centos7 etc] # getent group distro # verify the GID of distro

Distro:x:2019:

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

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

[root@centos7 etc] # id mandriva # verify the UID number and basic group of mandriva

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

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

[root@centos7 etc] # useradd mageia-u 1100-d / home/linux

[root@centos7 etc] # getent passwd mageia # Verification result

Mageia:x:1100:1100::/home/linux:/bin/bash

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

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

[root@centos7 etc] # getent shadow mageia # Verification result

Mageia:!!:18308:0:7:7:::

(5) delete mandriva, but keep its home directory

[root@centos7 etc] # userdel mandriva

[root@centos7 etc] # ls / home/ # Verification result mandriva directory still exists

Diyoujia linux mandriva slackware test

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

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

[root@centos7 etc] # id slackware # Verification result

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

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

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

[root@centos7 etc] # getent passwd slackware # Verification result

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

(8) add additional group admins for user slackware

[root@centos7 etc] # usermod slackware-aG admins

[root@centos7 etc] # id slackware # Verification result

Uid=2002 (slackware) gid=2019 (distro) groups=2019 (distro), 2020 (peguin), 2021 (admins)

These are all the relevant knowledge points of this introduction. Thank you for your study. I hope the collated content can help you.