dir

Router>
Router>en
Router#dir
Directory of flash:/

    3  -rw-     5571584          <no date>  c2600-i-mz.122-28.bin
    2  -rw-       28282          <no date>  sigdef-category.xml
    1  -rw-      227537          <no date>  sigdef-default.xml

64016384 bytes total (58188981 bytes free)
Router#