Linux Learning Notes (11)

One, Windows and Linux transfer files

Prerequisites: Xshell and SECURECRT support. Putty not supported

Yum Install Lrzsz

650) this.width=650; "Src=" Https://s2.51cto.com/oss/201710/26/44ae81c4a29fa2541ef476165f2e9276.png-wh_500x0-wm_3 -wmp_4-s_438542439.png "title=" 1.png "alt=" 44ae81c4a29fa2541ef476165f2e9276.png-wh_ "/>

Linux =====> windows

SZ + file

650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/26/be385ae48ae0042f468e2d5671979434.png-wh_500x0-wm_3 -wmp_4-s_2963305510.png "title=" 2.png "alt=" Be385ae48ae0042f468e2d5671979434.png-wh_ "/>

Windows =====> Linux (upload to current directory)

Rz

650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/26/b21873a16966aecfe610bd1272b82f7a.png-wh_500x0-wm_3 -wmp_4-s_1846641869.png "title=" 3.png "alt=" B21873a16966aecfe610bd1272b82f7a.png-wh_ "/>

Ii. user profile and password configuration file

/etc/passwd/User's password file (the created user will add a line to the file)

(1) Username: (2) x (previous password): (3) UID: (4) GID: (5) User's comment information: (6) User's home directory: (7) User's shell (/sbin/nologin cannot log in)

/etc/shadow/dedicated password (and/etc/passwd/is one by one corresponding)

(1) User name: (2) User's password (encrypted, cannot decompile): (3) from 1970.1.1 to the last password changed how many days: (4) A few days before you can change the password (default is 0); (5) The password expires in a few days A few days after the password must be changed: (6) Password Expiration warning Period: (7) Account lockout time (password has expired, and then a few days to lock the account): (8) account distance from 1970.1.1 after the number of days locked: (9) Reserved fields

650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/26/9d8a04f5e2b190f9e5430ffbdd5031e7.png-wh_500x0-wm_3 -wmp_4-s_3146908162.png "title=" 1.png "alt=" 9d8a04f5e2b190f9e5430ffbdd5031e7.png-wh_ "/>

Third, user group management

/etc/group/

/etc/gshadow/configuration file for group password

/etc/shadow-//etc/passwd/etc/gshadow-/file behind the belt-, the system automatically for our backup, accidentally deleted, can be copied back, there may be new users are not updated in a timely manner.

650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/26/28986c4ab5e2ea409f78d17c30346eca.png-wh_500x0-wm_3 -wmp_4-s_3638221196.png "title=" 1.png "alt=" 28986c4ab5e2ea409f78d17c30346eca.png-wh_ "/>

650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/26/d174c0c203414f6107c4b03bc4ec6df4.png-wh_500x0-wm_3 -wmp_4-s_4013344772.png "title=" 2.png "alt=" D174c0c203414f6107c4b03bc4ec6df4.png-wh_ "/>

Group concept: There are a lot of users in a group

Groupadd Add Group

-g (number preferably above 1000) specify GID

Groupdel Delete a group (there must be no users within the group)

650) this.width=650; "Src=" Https://s5.51cto.com/oss/201710/26/b4de6c967e16354d1017fc449c0ff5f7.png-wh_500x0-wm_3 -wmp_4-s_941549175.png "title=" 3.png "alt=" B4de6c967e16354d1017fc449c0ff5f7.png-wh_ "/>

Iv. User Management

Useradd adding users

-u Specifies the UDI uid starting from 1000

-G + Group name specifies the group to join

-D + Home directory path/home directory

-S + shell specifies shell for new user

-M does not allow the creation of a home directory when creating a user

650) this.width=650; "Src=" Https://s4.51cto.com/oss/201710/26/64e795ff738e7811b3355f02d5e57daf.png-wh_500x0-wm_3 -wmp_4-s_4092922916.png "title=" 1.png "alt=" 64e795ff738e7811b3355f02d5e57daf.png-wh_ "/>

Userdel Delete User does not delete User8 's home directory

-R along with home directory delete

650) this.width=650; "Src=" Https://s2.51cto.com/oss/201710/26/f471918ed43bf5533dfb4fddedb1ed26.png-wh_500x0-wm_3 -wmp_4-s_3128197289.png "title=" 2.png "alt=" F471918ed43bf5533dfb4fddedb1ed26.png-wh_ "/>

Linux Learning Notes (11)