File and Directory Management

Managing files and directories is essential when working with HPC systems. This section covers commands that allow you to manipulate files, move them between directories, create new directories, copy files, change file ownership and permissions, and delete them as needed.

Useful Commands

1. Move or Rename Files and Directories

   mv source_file_or_directory target_directory_or_filename

   Moves a file or directory from one location to another. It can also be used to rename files and directories.
   
   

2. Remove Files or Directories

   rm filename

   Removes (deletes) a file. Use with caution, as deleted files are not recoverable.
   
   

   rm -r directory

   Recursively removes a directory and its contents. This command is used for deleting directories.

    

3. Remove Empty Directories

   rmdir directory

   Removes an empty directory. This command only works if the directory is empty.
   
   

4. Create Directories

   mkdir directory_name

   Creates a new directory with the specified name.
   
   

5. Copy Files or Directories

   cp source_file target_file

   Copies a file to a new location.

   cp -r source_directory target_directory

   Recursively copies a directory and its contents to a new location.
   
   

6. Create Empty File

   touch filename

   Creates an empty file with the specified name. If the file already exists, update its timestamp.
   
   

7. Change File Ownership

   chown new_owner:new_group filename

   Changes the owner (and group) of a file to the specified user (group).
   
   

   chown -R new_owner:new_group directory

   Recursively changes the owner of a directory and its contents to the specified user (group).
   
   

8. Change File Permissions

   chmod permissions filename

   Changes the permissions of a file. Permissions can be specified using octal numbers (e.g., chmod 644 file) or symbolic notation (e.g., chmod u+x file). See Linux file permissions explained | Enable Sysadmin (redhat.com) for more information on file permissions.
   
   

   chmod -R permissions directory

   Recursively changes the permissions of a directory and its contents.