Linux OPS-3rd week jobs

Content of this week's job:

1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.

#who | tr-s [[: Space:]] | Cut-d ""-f1 | Sort-u

[email protected] bin]# who | tr-s [[: Space:]] | Cut-d ""-f1 | Sort-u

Kzxjwb

Root

2. Remove the information about the user who last logged in to the current system.

#last | Head-1

[Email protected] bin]# Last | Head-1

Root PTS/4 223.72.80.48 Mon Oct 23:07 still logged in

3. Remove the shell that is the user's default shell on the current system.

#cat/etc/passwd | Cut-d ":"-f7 | uniq-c | Sort-n | Tail-1 | tr-s [[: Space:]] | Cut-d ""-f3

[Email protected] webapps]# CAT/ETC/PASSWD | Cut-d ":"-f7 | uniq-c | Sort-n | Tail-1 | tr-s [[: Space:]] | Cut-d ""-f3

/sbin/nologin

4, the information of the third field in/ETC/PASSW D with the largest number of the first 10 users is changed to uppercase and then saved to the/tmp/maxusers.txt file.

[Email protected]/]# CAT/ETC/PASSWD | Sort-t ":"-nk3 | tail-10 | tr [A-z] [a-z] >/tmp/maxusers.txt

[Email protected]/]# Cat/tmp/maxusers.txt

User2:x:1024:1026::/home/user2:/bin/bash

User3:x:1025:1027::/home/user3:/bin/bash

User4:x:1026:1028::/home/user4:/bin/bash

User5:x:1027:1029::/home/user5:/bin/bash

User6:x:1028:1030::/home/user6:/bin/bash

User7:x:1029:1031::/home/user7:/bin/bash

User8:x:1030:1032::/home/user8:/bin/bash

User9:x:1031:1033::/home/user9:/bin/bash

User10:x:1032:1034::/home/user10:/bin/bash

User11:x:1033:1035::/home/user11:/bin/bash

5, take out the IP address of the current host, hint: The result of ifconfig command is sliced.

#ifconfig | Grep-e "inet addr" | Cut-d ":"-f2 | Cut-d ""-f1

6. List the file names of all files ending with. conf in/etc directory and convert their names to uppercase and save them to the/tmp/etc.conf file.

[Email protected]/]# ls/etc/*.conf | tr [A-z] [a-z] >/tmp/etc.conf

[Email protected]/]# cat/tmp/etc.conf

/etc/asound. CONF

/ETC/DNSMASQ. CONF

/etc/dracut. CONF

/etc/e2fsck. CONF

/etc/host. CONF

/etc/kdump. CONF

/etc/krb5. CONF

/etc/ld. So. CONF

/etc/libaudit. CONF

/etc/libuser. CONF

/etc/locale. CONF

/etc/logrotate. CONF

/etc/man_db. CONF

/etc/mke2fs. CONF

/etc/nsswitch. CONF

/ETC/NTP. CONF

/etc/resolv. CONF

/etc/rsyslog. CONF

/etc/sestatus. CONF

/etc/sudo. CONF

/etc/sudo-ldap. CONF

/etc/sysctl. CONF

/ETC/TCSD. CONF

/etc/vconsole. CONF

/etc/yum. CONF

7. Displays the total number of sub-directories or files in the/var directory.

[Email protected]/]# Ll/var | Wc-l

22

8. Remove the names of the 10 groups with the smallest number of the third field in the/etc/group file.

[Email protected]/]# Cat/etc/group | Sort-t ":"-nk3 | head-10 | Cut-d ":"-f1

Root

Bin

Daemon

Sys

cd/

Tty

Disk

Lp

9, the contents of the/etc/fstab and/etc/issue files are merged into the same content and saved to the/tmp/etc.test file.

[Email protected]/]# cat/etc/fstab/etc/issue >/tmp/etc.test

[Email protected]/]# cat/tmp/etc.test

#

#/etc/fstab

# Created by Anaconda on Fri Mar 11 01:59:10 2016

#

# Accessible filesystems, by reference, is maintained under '/dev/disk '

# See mans Pages Fstab (5), Findfs (8), mount (8) and/or Blkid (8) for more info

#

UUID=E7EDF137-5D28-407F-98B9-804EAD7732B2/XFS Defaults 0 0

Uuid=6d3d5767-9a65-4f80-ae84-87d2c324edbd/boot XFS Defaults 0 0

Uuid=63a207f4-e7ae-4b27-87c5-f56054d49206/data XFS Defaults 0 0

Uuid=d0e6dd42-8f9c-4fba-b450-d068475fbb14/tmp XFS Defaults 0 0

UUID=9015AA16-40BD-46DB-8C6B-B019513A8111/USR XFS Defaults 0 0

UUID=DCBBA68B-953B-4CD5-9B92-88801EF89C0A swap swap defaults 0 0

\s

Kernel \ r on an \m

10. Summarize the methods used to describe the user and group management commands and complete the following exercises:

(1), create group distro, its GID is 2016;

[Email protected] ~]# groupadd-g distro

[Email protected] ~]# Cat/etc/group |tail-1

DISTRO:X:2016:

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

[Email protected] ~]# useradd-u 1005-g distro Mandriva

Useradd:uid 1005 is not unique

[Email protected] ~]# useradd-u 1105-g distro Mandriva

[[email protected] ~]# ID Mandriva

uid=1105 (Mandriva) gid=2016 (distro) groups=2016 (distro)

(3), create user Mageia, whose ID number is 1100, home directory is/home/linux;

[Email protected] ~]# useradd-u 1100-d/home/linux Mageia

[Email protected] ~]# CAT/ETC/PASSWD | Tail-1

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

(4), to the user mageia add password, password for mageedu;

[Email protected] ~]# echo "mageedu" | Passwd–stdin Mageia

Passwd:only one user name may specified.

(5), delete Mandriva, but retain their home directory;

[Email protected] ~]# CAT/ETC/PASSWD | grep Mandriva

Mandriva:x:1105:2016::/home/mandriva:/bin/bash

[Email protected] ~]# Userdel Mandriva

(6), create user Slackware, its ID number is 2002, the basic group is distro, additional group Peguin;

[Email protected] ~]# Groupadd Peguin

[Email protected] ~]# useradd-u 2002-g distro-g Peguin Slackware

[[email protected] ~]# ID Slackware

uid=2002 (Slackware) gid=2016 (distro) groups=2016 (distro) (Peguin)

(7), modify the Slackware default shell for/BIN/TCSH;

[Email protected] ~]# CAT/ETC//PASSWD | Tail-1

Slackware:x:2002:2016::/home/slackware:/bin/bash

[Email protected] ~]# usermod-s/bin/tcsh Slackware

[Email protected] ~]# CAT/ETC/PASSWD | Tail-1

Slackware:x:2002:2016::/home/slackware:/bin/tcsh

[Email protected] ~]#

(8), add additional Group admins for user Slackware;

[Email protected] ~]# groupadd Admins

[Email protected] ~]# usermod-ag admins Slackware

[[email protected] ~]# ID Slackware

uid=2002 (Slackware) gid=2016 (distro) groups=2016 (distro), (Peguin), 2018 (admins)

(9), add password for Slackware, and require the minimum password age of 3 days, the maximum is 180 days, warning for 3 days;

[Email protected] ~]# echo Slackware | PASSWD–STDIN-N3-X180-W3 Slackware

Passwd:only one user name may specified.

[Email protected] ~]# Cat/etc/shadow | Tail-1

slackware:!! : 17098:0:99999:7:::

(10), add user OpenStack, whose ID number is 3003, the basic group is clouds, the additional group is Peguin and Nova;

Useradd-u 3003-g clouds-g Peguin OpenStack

(11), add the system user MySQL, request its shell for/sbin/nologin;

#useradd-R-s/sbin/nologin MySQL

(12), use the echo command, non-interactive add a password for OpenStack.

echo OpenStack | Passwd–stdin OpenStack &>/dev/null

This article is from the "9099360" blog, please be sure to keep this source http://9109360.blog.51cto.com/9099360/1865243

Linux OPS-3rd week jobs