SYNOPSIS
      xforall <filepattern> <command>

DESCRIPTION
      Execute <command> for all matching files. The <command> string can
      contain replacment marks. Currently there are five of these marks:
      - "!!" this mark stands for the full file name.
      - "!e" stands for the extension of the file name.
      - "!f" stands for the file name without extension and directory name.
      - "!h" stands for the full directory name of the files.
      - "!r" stands for the full file name without file extension.
      - "!t" stands for the file name without the directory name.

      If the full file name would be "/directory/file.ext" then
      "!!" equals "/directory/file.ext"
      "!e" equals "ext"
      "!f" equals "file"
      "!h" equals "/directory"
      "!r" equals "/directory/file"
      "!t" equals "file.ext"

EXAMPLES
      xforall ~/room/*.c xcall !r->reset();
      Call the reset() function in all your rooms.

      xforall ~/obj/* mv !! !h/oldobj/!f.!e.old
      Move all files from your "obj" dir into the "obj/oldobj" dir and change
      the extensions.