Linux Preliminary Learning---commands

Ll-alinux command
LS View all document names
Ls-l View All Catalogs
LS/ETC display the files in the ETC directory
ll view the document permissions information, the last three bits are: file capacity, file date Modified, file info
ll/View Document root directory
Ll-a See if there is a hidden directory in the directory
Ll-d/View the root directory itself permissions
Exit immediately Linux
Poweroff shut down the machine
Date view current time or format output time
Date +%y/%m/%d output format time, as of 2016/09/22
Su-Switch account, identity
Date month + date + hour + minute + year
PWD Displays the directory where you are currently
Pwd-p show exactly where the directory path is
mkdir + directory name create new directory
Mkdir-p + directory name Create multiple directories
RmDir + directory Name Delete empty directory (there is no way to delete content)
Rmdir-p + directory Name Delete multiple empty directories

CP Copy files or directories
Options and Parameters:
-A: As-pdr means, please refer to the following instructions for PDR. (common)
-D: If the source file is the attribute of the link file, the link file property is copied instead of the file itself;
-F: For force, if the target file already exists and cannot be opened, then try again after removing it;
-I: If the target file (destination) already exists, the action will be asked (commonly used) when overwriting
-L: Create a link file for a hard link, rather than copying the file itself;
-P: Copy the past along with the properties of the file, rather than using the default properties (backup is often used);
-R: Recursive continuous replication, used for the replication behavior of the directory; (Common)
-S: Copy becomes the symbolic link file (symbolic link), i.e. "shortcut" files;
-U: Upgrade destination If destination is older than source!
RM to remove files or directories
Options and Parameters:
-F: Is the meaning of force, ignoring the nonexistent file, no warning message appears;
-I: Interactive mode that asks the user whether or not to move before deleting
-R: Pass it back! Most commonly used in directories are deleted! This is a very dangerous option!!!


User and User group management
Useradd add a new user account
Options:
-C Comment Specifies an annotative description.
The-D directory specifies the home directory, and if this directory does not exist, the-m option can be used to create the master directory.
The-G user group specifies the user group to which the user belongs.
-G user Group, user group specifies the additional group to which the user belongs.
-S Shell file specifies the user's login shell.
-u user number specifies the user's user number, and if you have the-o option, you can reuse the other user's identification number
For example # useradd–d/usr/sam-m Sam
This command creates a user Sam, where the-D and-m options are used to generate a home directory for the login Sam/usr/sam
(/usr is the parent directory where the default user home directory resides)

Userdel Delete user account
The userdel-r common option is-r, which is to remove the user's home directory

passwd User Password Management
Options available for use:
-L locks the password, which disables the account.
-u password to unlock.
-D make the account no password.
-F forcing the user to change the password at next logon

Disk Management
DF: List The overall disk usage of the file system
Options and Parameters:
-A: Lists all file systems, including system-specific/proc, etc.
-K: Displays the file system in Kbytes capacity;
-M: Display the file system in MBytes capacity;
-H: GBytes, MBytes, Kbytes and other formats are displayed by people who are easier to read;
-H: Replace m=1024k with m=1000k;
-T: Displays the file system type, along with the filesystem name of the partition (for example, ext3);
-I: Do not use the hard disk capacity, but the number of inode to display


Du: Check Disk space usage
-A: Lists all files and directory capacity, because the default is only the number of files under the directory.
-H: Displayed in a more readable capacity format (g/m);
-S: Lists the total, not the capacity of each directory;
-S: does not include totals under subdirectories, and is somewhat different from-S.
-K: List capacity display in Kbytes;
-M: List capacity display with MBytes;


FDISK: For disk partitioning
-L: Outputs all the partition contents of the device after the output. If there is only fdisk-l, the system will list the partitions of the device that can be searched in the whole system.
Press Q When you leave Fdisk, then all actions will not take effect! Conversely, pressing w means that the action takes effect.

Touch Create File
Cat View File Contents
VI Edit file Contents esc+:wq Save Edit and Exit I go to edit
File type: the
-Representative documents
D Represents a Folder

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Linux Preliminary Learning---commands