(4) Linux Common Command Learning

Common Linux Commands basic formatcommand [options] [parameters]
Note: The individual commands used do not follow this format and can be written together when there are multiple options. Simplified and complete Options-A equals--all
[email protected] ~]#among them:Root: currently logged in userlocalhost: host name ~ current directory (home directory)# Super User's promptthe prompt for a normal user is $the Administrator account in Linux is root1, the contents of the query directory: LSls [options] [file or directory]Options:-A displays all files, including hidden files - L Show more information- D View Directory Properties- h humanized display file size-I display inode
Permission Explanation:

• -rw-r--r--
  • - file type (-file d directory l soft link file)
  • rw-r--r--

u owner G-owned group O other person R Read W write x executeIi. Establishment of the catalogue: mkdir

• mkdir-p [directory Name]

-P Recursive creation Command English willing:makedir ectories
third, the directory where you switch: CD

• CD [catalogue]

command English Willing: Change directory

• Simplify operations

CD ~ Enter the current user's home directoryCDCD-Go to last directoryCD.. Go to the top level directoryCD. Go to current directory  

• Relative path: Search by reference to the current directory

such as: [[email protected] ~] # CD. /usr/local/src/

• Absolute path: Specified from the root, recursive lookup at the first level. In any directory, access to the specified location

such as: [[email protected] ~]# cd/etc/

Tips: Ctrl+l Clear screen, tab can be used to complete the directory or command completionIv. the directory where the query is located: pwd

• Pwd

Command English original meaning:printworkingdirectoryv. Delete empty directory: rmdir (deprecated)

• rmdir [directory Name]

Command English original meaning:removeemptydir ectories vi. Deleting files or directories: RM (recommended)

• RM-RF [file or directory]

Command English original meaning: remove Options:- R Delete directory- F Mandatory
vii. Copy command: CP

• CP [Options] [Original file or directory] [target directory]

Command English original:coP y Options:- r Copy directory-P Joint file attribute copy -D If the source file is a linked file, copy the link property-A equals-pdr

Tip: Ls-l works the same as LL command
eight, cut or rename command: MV

• MV [original file or directory] [target directory]

Command English original meaning:mov e
the role of the common directory

• /root
• /bin Command Save directory (commands that normal users can read)
• /boot start directory, start related files
• / Dev Device File save directory
• /etc configuration File Save directory
• /home home directory for ordinary users
• /lib System Library Save directory
• /mnt system mount directory
• /media mount directory
• /root Super User's home directory
• /tmp temp directory
• /sbin command to save directory (directory that superuser can use)
• /proc write directly to memory
• /sys
• /USR system software Resource Directory

/usr/bin/System command (normal user) /usr/sbin/system command (super User)

• /var system related document content

Link Command

• ln-s [Original file] [target file]
• Command English original meaning: link
• Function Description: Generate link file

option:-S to create a soft link hard-Link features:1, have the same I node and storage block block, can be seen as the same file2, can be identified by the I node3. Cannot cross partition4. Cannot be used for directory
Soft Link Features:1, similar to Windows fast key mode2, the soft link has its own I node and block blocks, but the data block only save the original file name and I node number, and no actual file data3, lrwxrwxrwx l Soft linkSoft Link file permissions are rwxrwxrwx4, modify any file, the other one has changed5, delete the original file, soft links can not be used

(4) Linux Common Command Learning