Marco 2016 new Linux+python high-end operation Viban-linux user creation and rights management

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

[email protected] ~]# who | Cut-d '-f1 | Sort-u CentOS Liu Root

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

The first way: [[email protected] ~]# Last | Head-n1 Liu Tty8:2 Sun 10:26 still logged in the second way: [Email Protec Ted] ~]# who | Tail-n1 Liu Tty8 2016-08-21 10:26 (: 2)

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

[Email protected] ljohn]# cut-d:-f7/etc/passwd | uniq-c | Sort-n | Tail-n1 25/sbin/nologin

NOTE:/ETC/PASSWD Name:password:UID:GID:GECOS:directory:shell
4, the third field in the/etc/passwd the value of the largest 10 users of the information is changed to uppercase and saved to the/tmp/maxusers.txt file.

 [[email protected] ljohn]# sort -t: -k3 -n /etc/passwd |  tail -10 | tr  ' A-Z '   ' A-Z '  > /tmp/maxusers.txt    [[ Email protected] ljohn]# cat /tmp/maxusers.txt     rtkit:x : 499:497:realtimekit:/proc:/sbin/nologin    liu:x:500:500:liujian:/home/liu:/bin/bash     bash:x:501:501::/home/bash:/bin/bash    basher:x:502:502::/home/ basher:/bin/bash    testbash:x:503:503::/home/testbash:/bin/bash     Nologin:x:504:504::/home/nologin:/sbin/nologin    user1:x:505:505::/home/user1:/bin/bash     centos:x:506:506::/home/centos:/bin/bash    useradd1:x:507:507::/ home/useradd1:/bin/bash    nfsnobody:x:65534:65534:anonymous nfs user:/var/lib/ Nfs:/sbin/nologin

5. Remove the IP address of the current host, and tip: Slice the results of the ifconfig command.

[[email protected] ljohn]# ifconfig eth1    eth1       Link encap:Ethernet  HWaddr 00:0C:29:45:CC:5E                 inet addr:192.168.188.21   Bcast:192.168.188.255  Mask:255.255.255.0               inet6 addr: fe80::20c:29ff:fe45:cc5e/64 Scope:Link               up broadcast running  MULTICAST  MTU:1500  Metric:1               rx packets:5871 errors:0 dropped:0 overruns:0 frame:0               TX packets:2355  Errors:0 dropped:0 overruns:0 carrier:0               collisions:0 txqueuelen:1000                RX bytes:486015  (474.6 kib)   TX bytes:259218  (253.1  KiB)               interrupt:19 base  address:0x2000 [[email protected] ljohn]# ifconfig eth1 | head - n2 | tail -n1 | cut -d: -f2 | cut -d '   '  -f1     192.168.188.21

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] ljohn]# ls/etc/*.conf | Tr ' A-Z ' A-Z ' >/tmp/etc.test [[email protected] ljohn]# Cat/tmp/etc.test/etc/asound. Conf/etc/autofs_ldap_auth. Conf/etc/cas. CONF/ETC/DNSMASQ. Conf/etc/dracut. Conf/etc/fprintd. Conf/etc/gai. Conf/etc/grub. Conf/etc/gssapi_mech.        CONF.        . .

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

[Email protected] ljohn]# Ls/var | Wc-l 21

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

[Email protected] ljohn]# sort-t:-k3-n/etc/group | head-10 | cut-d:-f1 root bin daemon sys ADM TTY disk LP MEM Kmem

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] ljohn]# cat /etc/fstab  /etc/issue >  /tmp/etc.test     [[email protected] ljohn]# cat /tmp/ etc.test     #    # /etc/fstab    #  Created by anaconda on Thu Feb 12 05:17:12 2015     #    # accessible filesystems, by reference, are  maintained under  '/dev/disk '     # see man pages fstab ( 5),  findfs (8),  mount (8)  and/or blkid (8)  for more info     #    UUID=3fcabd0f-e9fb-4618-918d-c9e004fe6a59 /                         ext4    defaults        1 1    uuid= 234cc62b-7746-477d-ad58-8fb2448b9788 /boot                    ext3    defaults         1 2    UUID=b2c5da64-87b4-44c0-8864-f4a006b824fc  swap                     swap    defaults        0 0     tmpfs                    /dev/shm                 tmpfs   defaults        0  0    devpts                  /dev/pts                 devpts   gid=5,mode=620  0 0    sysfs                    /sys                     sysfs    defaults        0 0    proc                     / proc                    proc    defaults        0 0     centos release 6.5  (Final)     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] ljohn]# groupadd-g distro [[email protected] ljohn]# tail-1/etc/group distro:x:2 016:

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

[Email protected] ljohn]# useradd-u 1005-g mandirva [[email protected] ljohn]# ID Mandirva uid=1005 ( Mandirva) gid=2016 (distro) group =2016 (distro)

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

[Email protected] ljohn]# useradd-u 1100-d/home/linux mageia [[email protected] ljohn]# ID Mageia uid=11 XX (Mageia) gid=1100 (Mageia) group =1100 (Mageia) [[email protected] ljohn]# tail-1/etc/passwd mageia:x:1100:1100 ::/home/linux:/bin/bash

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

[Email protected] ljohn]# echo "mageedu" |        passwd--stdin Mageia Change the password for the user Mageia. PASSWD: All the authentication tokens have been successfully updated.

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

[Email protected] ljohn]# Userdel mandirva [[email protected] ljohn]# Ls/home/bash basher CentOS Linu X Liu Mandirva nologin testbash user1 useradd1 [[email protected] ljohn]# ID Mandirva id:mandirva: No such use Households

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

[Email protected] ljohn]# groupadd Peguin [[email protected] ljohn]# useradd-u 2002-g distro-g Peguin Slackware [[email protected] ljohn]# tail-1/etc/passwd slackware:x:2002:2016::/home/slackware:/bin/bash [[em AIL protected] ljohn]# ID slackware uid=2002 (slackware) gid=2016 (distro) group =2016 (distro) (Peguin)

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

[Email protected] ljohn]# usermod-s/bin/tcsh slackware [[email protected] ljohn]# TAIL-1/etc/passwd s Lackware:x:2002:2016::/home/slackware:/bin/tcsh

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

[Email protected] ljohn]# sort-t:-k3-n/etc/group | head-10 | cut-d:-f1 root bin daemon sys ADM TTY disk LP MEM Kmem

(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] ljohn]# passwd-n 3-x 180-w 3 slackware Adjust user password aging data slackware. PASSWD: Operation successful [[email protected] ljohn]# tail-1/etc/shadow slackware:!! : 17034:3:180:3:::

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

[Email protected] ljohn]# groupadd clouds [[email protected] ljohn]# groupadd Nova [[email protected] Ljo hn]# useradd-u 3003-g clouds-g Peguin,nova openstack [[email protected] ljohn]# ID openstack uid=3003 (o Penstack) gid=2019 (clouds) group =2019 (Clouds), Peguin (Nova)

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

[[email protected] ljohn]# useradd-s/sbin/nologin MySQL [[email protected] ljohn]# tail-1/etc/passwd Mys Ql:x:3004:3004::/home/mysql:/sbin/nologin

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

[Email protected] ljohn]# echo "OpenStack" |        passwd--stdin OpenStack Changes the password for user OpenStack.        PASSWD: All the authentication tokens have been successfully updated. [Email protected] ljohn]#

This article is from the "Ljohn" blog, make sure to keep this source http://ljohn.blog.51cto.com/11932290/1840868

Marco 2016 new Linux+python high-end operation Viban-linux user creation and rights management