These are the rmfd files.

rmfd is a fork of rm from GNU Coreutils version 8.5.  It has been
forked to add the new option --warnings (short name -w).  This option
reads a list of path names from $HOME/.rmfd/warn.list and warns the
user if the rmfd invocation will result in the removal of any of those
files.  The user is issued a prompt to continue, and if the user
declines, nothing is removed (there is an inherent race condition, so
once it starts removing files, it will still check the list and never
remove a file without prompting, but at that point it can't restore
the files that were already deleted).

It attempts intelligent handling of symbolic links.  If a symbolic
link is put in the list, rmfd will warn if either the link or the
target of the link is going to be deleted.  If a directory is found in
the list, it will furthermore warn if a recursive removal of the
directories contents are attempted through a symbolic link.

It attempts to catch mistakes with globs.  If a directory D is in the
list, it will do its best to discern when `cd D ; rm *' or `rm D/*' is
being invoked, and will warn and prompt for whether to continue.

When stderr is attached to a terminal it uses color (bright red) for
warnings to be sure they are not mistaken for normal output.

Other than that, and without the --warnings option, rmfd behaves
identically to rm.  It is meant to be a drop-in replacement for
/bin/rm.

Here are some examples:

        $ cd /tmp
        $ echo /tmp/d/b > ~/.rmfd/warn.list
        $ mkdir d
        $ touch d/{a,b,c}
        $ rm -rw d
        rm: WARNING: you are about to remove `/tmp/d/b'; continue? n
        $ ls d
        a  b  c
        $ echo /tmp/d > ~/.rmfd/warn.list
        $ cd d
        $ rm -w *
        rm: WARNING: you are about to remove 3 files via `/tmp/d/*'; continue? n
        $ cd ..
        $ rm -w d/*
        rm: WARNING: you are about to remove 3 files via `/tmp/d/*'; continue? n
        $ ln -s d e
        $ rm -rw e
        rm: WARNING: you are about to recursively remove the contents of `/tmp/d' through symbolic link `e'; continue? n
        $ rm -w e
        $ rm -rw d
        rm: WARNING: you are about to remove `/tmp/d'; continue? y
        $ ls d e
        ls: cannot access d: No such file or directory
        ls: cannot access e: No such file or directory
        $ rm ~/.rmfd/warn.list ; touch d ; rm -w d && ls d
        ls: cannot access d: No such file or directory

The --warnings option overrides the --force option, so it's simple to
alias rm to 'rm -w' and use it as you always would.