Linux Study notes third week first Class (February 5)

2.27linux and Windows inter-pass files

With Xshell Software

#yum install-y Lrzsz

Linux to Windows, command for #sz a.txt save to Windows as prompted

Windows to Linux, command to select Windows files for #rz, then save to current directory

3.1 User profile and password configuration file 5

/ETC/PASSWD user account password file, configuration file;

Configuration file contents, separated by colons, a total of 7 columns;

First column, user name;

In the second column, the password is all represented by X;

third column, UID;

Fourth column, GID;

Fifth column, note;

Sixth column, user home directory;

Seventh column, user shell directory;

/etc/shadow dedicated user password;

Configuration file contents, separated by colons, a total of 9 columns;

First column, user name;

The second column, the encrypted password;

The third column, the number of days the password was last modified from January 1, 1970;

The fourth column, the password How many days to modify ;

The fifth column, the password to how many days must be modified;

The sixth column, the number of warning days before the password expires;

The seventh column, the password has expired, and then a few days account failure;

Eighth column, account life cycle, distance from January 1, 1970;

Nineth column, reserved field;

Account aming Set Password, command for #passwd aming

3.2 User Group Management

/etc/group user group configuration file, similar to user password profile; user group name, password, GID, etc.;

/etc/gshadow user group password file, similar to user password file;

User and user group related backup files

File name plus-, for backup files, when used to remove-can;

Create group GRP1, command for #groupadd GRP1;

Create group GRP1 and specify GID, command for #groupadd-g 1005 GRP1;

View User group profile The last line is the new Add group information, the command is #tail-n1/etc/group;

Delete Group GRP1, if the group does not have a user, the command is #groupdel GRP1;

3.3 User Management

Create user, command for #useradd User2;

Create user, and specify UID and GID, command for #useradd-u 1004-g 1005 user2;

Create user and specify UID and GID, home directory, user shell directory, command for #useradd-u 1004-g 1005-d/home/aming111-s/sbin/nologin user2;

Create user, do not create home directory, command for #useradd-m User2;

To view the newly created user password information, the command is #tail-n2/etc/passwd;

Delete the user, the command for #userdel User2, did not delete the user home directory, and then remove the home directory, #rm-rf/home/user2;

Delete users, and delete the user home directory, command for #userdel-r User2;

Useradd can also be used adduser, the same function;

Linux Study notes third week first Class (February 5)