rm source_file ...
The rm command is not reversible. The shell doesn't provide a Trash from where the deleted files and directories can be restored.
The option -i can be used to request confirmation before deleting a file or a directory.

• Remove a file (see bellow the option -i to request confirmation before deleting the file):
  $ rm file1
  
• Remove all files (excluding subdirectories and files starting with a period (.)) in the folder:
  $ rm folder1/* It may complain that there are subdirectories in folder1: "rm: folder1/folder11: is a directory".
  
  
• Remove all files starting with a period (.) in a folder (excluding sub-directories).
  $ rm folder1/.* It may show this warning: "rm: "." and ".." may not be removed".
  
  
• Remove the directory
  $ rm -R folder1

The following options can be used:
-R |If source_file designates a directory, the directory will be deleted with all its files and sub-directories. -f |Remove files without prompting for confirmation, regardless of the file''s permissions. |If the file does not exist, do not display a diagnostic message or modify the exit status to reflect an error. |The -f option overrides any previous -i options. -i |Request confirmation before attempting to remove each file, regardless of the file's permissions. |The -i option overrides any previous -f options. -v |Cause rm to be verbose, showing files as they are removed.