The Mac Terminal in OS X Mavericks uses the "rm" command to delete files, and either "rm" or "rmdir" to delete folders. Unlike the normal "Move to Trash" command, deleting a file or folder is permanent in the Terminal, so use the "mv" command if you want to keep the file in your Trash.
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Using RM and RMDIR
Type "rm" followed by the name of a file to permanently delete it from your hard drive. File names with a space in them must be "escaped" using a backslash ("\") character, so delete the file "this file.doc" with the command "rm this\ file.doc". You can also type "this" and hit the tab key to auto-fill the rest of the file name. Use "rmdir" followed by a folder name to delete an empty folder. To delete a folder with files in it, type "rm -r" followed by the folder name.
Moving Files to Trash
If you want to change your mind about deleting a file, move it to the Trash with the "mv" command with the syntax "mv [file name] ~/.Trash". The tilde and the period before the word "Trash" are required.