Switch>enable
Switch#rename flash:config.old flash:config.text
Destination filename [config.text]? config.text
Switch#dir
Directory of flash:/

    2  drwx         192   Mar 1 1993 00:09:30 +00:00  c3560-ipbase-mz.122-35.SE5
  460  -rwx        1036   Mar 1 1993 00:05:00 +00:00  vlan.dat
  461  drwx          64   Mar 1 1993 00:24:23 +00:00  c3560-ipbase-mz.122-25.SEE2
  463  -rwx           5   Mar 1 1993 06:12:26 +00:00  private-config.text
  465  -rwx        2160   Mar 1 1993 06:12:26 +00:00  config.text

32514048 bytes total (17027584 bytes free)
Switch# 
Switch# copy flash:config.text system:running-config
Destination filename [running-config]? running-config

2160 bytes copied in 0.260 secs (8308 bytes/sec)