Ubuntu system commands (updating), ubuntu updating

Ubuntu system commands (updating), ubuntu updating

1. Enable Ubuntu root User:

Set the root password for sudo passwd root (not required once)

Switch su root to the root user

2 disable Ubuntu root users:

Sudo passwd-l root (disabling the root password will not change)

Sudo passwd-u root (enable root account)

 

3. Download nodejs

 

1. Sudo apt-get install nodejs

 

After the installation is complete* Node-v *Check whether the nodejs installation is successful, but the result is that no node command is available.* Js-v *It is valid. It is inferred that nodejs is installed with apt-get, and js is automatically soft connected to nodejs. If you are not used to it, you can create a soft connection to node.

 

Ln-s/usr/bin/nodejs/usr/bin/node// Bind the global environment

 

2. sudo apt-get install npm

 

You don't need to bind the environment.

4. Common commands

DELETE command:

Rm: delete non-empty directories (multiple files can be deleted)

Rmdir: delete an empty directory.

Rm-rf directory name

-R refers to recursion down to manage the number of levels of directories and delete them together.

-F means to delete the file directly without any prompts.

5. Create a command

Mkdir directory name New Folder

Touch file name New File

6. Copy commands

 

Cp file name target path (copy a file to the target path)

 

Cp-I (if a file with the same name exists, output [yes/no] to check whether execution is performed)

 

Cp-f (Force copy file, with the same name not required)

7. Update command

 

Sudo apt-get upgrade (Update installed packages)

 

Sudo apt-get update (update source database)