1.touch
If the file does not exist, you can create a blank file
If the file already exists, you can modify the last modified date of the file
If 1a.txt originally existed, the modification date changed after touch.
2.mkdir
Create a new directory
The option -p means that directories can be created recursively
The name of the new directory cannot be the same as the existing directory or file in the current directory .
For example, use -p to create a1/b1/c1/d1/ folder recursively
The command is
mkdir -p a1/b1/c1/d1
or mkdir -p ~/desktop a1/b1/c1/d1
3.rm
A file or directory is deleted and cannot be recovered after deletion.
parameter | meaning |
-f | Force delete, ignore non-existing files without prompting |
-r | Recursively delete the contents of the directory, this parameter must be added when deleting the folder |
rm can also use wildcards *, ?, [], etc.
If there are these files on the desktop
Execute the rm -r *a* command, that is, delete all files or directories containing a
Now only these files are left on the desktop