Linux Novice Training Camp-command Daquan (continuous update)

1.

Authconfig--passalgo=sha256--update

Authconfig--test |grep hashing query current password encryption algorithm

Change the encryption type to a harder-to-crack sha512 algorithm

2.

Lscpu Displaying CPU attribute details

3.

Cat

4.

CHVT #

Switching terminals

5.chsh Changing the login shell

-L Display

/bin/sh

/bin/bash

/sbin/nologin

/bin/dash

/bin/tcsh

/bin/csh

-S specify (specify) your login shell

Chsh-s/sbin/nologin Hehe2

6.chfn:change Your finger information

7.chpasswd:update Passwords in batch mode

Batch Password

Precautions:

User name must exist

Can only be used by administrators

Directive file cannot have blank line

1.vim Mima.txt

root:54322345

2.chpassw<mima.txt

8.

Finger Display System User information

9.

Groupadd Creating a new group

-g Specifies the ID of the new group

10.groupmod

-N group_name: New name

-G GID replacement of new GID

11.groupdel

Delete a group

12.groupmems

-G Group Name

-A user name

-D Delete User name

-L Display Group members

-P Purge Group members

13.groups

Displays the group to which the user belongs

14.GRPCK * * *

Verifying group File Integrity

15.pwck

Used to verify the integrity of the contents and format of the system authentication files/etc/passwd and/etc/shadow.

16.pwunconv

The password bit disappears from the shadow into the Passwd,shadow

17.pwconv

Turn on user projection password

18.poweroff

Turn off the computer operating system and power off the system.

19.passwd

-L lock specified user

-U unlock

-N Shortest use period

--stdin: Receive user password from standard input

echo "passwd" |passwd--stid USERNAME

20.halt shutdown

21.hostname

Host Name

22.newusers

Batch update or create user

23.newgrp

Switch GID to other groups in the current environment

24.nano

25.id

Print User and group information

26.init 3,5

Init is the parent process for all processes

-s switch to single user mode

#0 downtime (never set Initdefault to 0) #1 single-user mode

#2 Multi-user, no NFS (similar to Level 3, will stop some services)

#3 full Multi-user mode

#4 didn't work.

#5 X11 (Xwindow)

#6 reboot (never set Initdefault to 6)

27.openssl Rand Base64 10

28startx

Open Xwindows

29SU-: Default switch to root

-Login switch, read the target user's configuration file

Non-logon switch, does not read the target user's profile

30.strace

Tracking system Calls

31tty

Print Terminal

32tr

Replace delete characters, use with pipe

33ifconfig

View IP Address

34useradd

Create user

-u uid: Specify UID

-G GID

-G Additional Group

-D Specify home directory

-C Comment Information

-S Specify shell

35usermod User Property Modification

-u uid: Specify UID

-G GID

-G new Add-on group, original will be overwritten

-ag Append additional groups

-C Comment Information

-D new home directory, files in the original home directory will not be moved to the new home directory at the same time

If you want to move, add-a

-L lock specified user

-E Specify expiration date

-U unlocks the specified user

36userdel

-R Delete User home directory

37uname Display System Information

-A Show All information

38VIPW Direct Edit passwd file

39VIGR Edit Group File directly

Memory usage of 40free display system

-b,k,m,g display in a different unit

41DF display of disk partition usage

-I inode use case

Lsb_release

The Lsb_release command is used to display information about LSB and specific versions.

43echo Printing

44gedit editing

45tee

LS |tee out.txt: Redirecting LS results to OUT.txt

46getent Passwd,shadow Group Gshadow

Quickly view a row for a user

47who execute the WHO command to know that there are currently users logged into the system, the individual who command will list the login account, the terminal used, login time and from where to log in or use which x monitor.

48whoami Current User

This article is from "Linux in the middle" blog, please be sure to keep this source http://11890711.blog.51cto.com/11880711/1833804

Linux Novice Training Camp-command Daquan (continuous update)