Scratchpad r1 (See the current copy)

 tcl>file exists x
 1
 tcl>file exists y
 0
 tcl>file rename x y
 tcl>file exists y
 1
 tcl>ls -ld y
 drwxr-xr-x 2 rkeene users 4096 2008-03-29 23:46 y