http://www.nongnu.org/gcmd/keys.html 
Keyboard mapping for GNOME Commander v1.2
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F1              Help
F2              Refresh files in the active file list
F3              View files
F4              Edit files
F5              Copy files
F6              Rename or move files
F7              Create directory
F8              Delete files
F9              Search
F10             Quit

ALT+1           Change left connection
ALT+2           Change right connection

ALT+F3          View with external viewer
ALT+F7          Search
ALT+F8          Open the history list for the command line

SHIFT+F2        Compare directories
SHIFT+F3        View with internal viewer
SHIFT+F4        Edit a new file
SHIFT+F5        Make a copy a file in the current directory
SHIFT+F6        Rename a file
SHIFT+F10       Bring up the context menu for the selected files

CTRL+F3         Sort by name
CTRL+F4         Sort by extension
CTRL+F5         Sort by date/time
CTRL+F6         Sort by size
CTRL+F7         Unsorted

CTRL+SHIFT+F5   Create symbolic link

=               Select files using a pattern
NUM +           Select files using a pattern
NUM -           Unselect files using a pattern
NUM *           Invert selection
NUM /           Restore selection
CTRL+NUM +      Select all files
CTRL+NUM -      Unselect all files
CTRL+=          Select all files
CTRL+-          Unselect all files
ALT+NUM +       Select all files with the same extension
ALT+NUM -       Unselect all files with the same extension

CTRL+A          Select all files
CTRL+SHIFT+A    Unselect all files

INSERT          Select file or directory
SPACE           Select file or directory (as INSERT). If SPACE is used on an
                unselected directory under the cursor, the contents in this
                directory are counted and the size is shown in the "full" view
                instead of the string <DIR>

ALT+ENTER       Show properties for the selected file

ALT+SHIFT+ENTER The contents of all directories in the current directory are
                counted. The sizes of the directories are then shown in the
                "full" view instead of the string <DIR>

BACKSPACE or LEFT or CTRL+PageUp
                Change to parent directory (cd ..)

ENTER           Change directory or execute command line if not empty
SHIFT+ENTER     Execute command line in the defined terminal and leaves the
                terminal window open

RIGHT or CTRL+PageDown
                Change directory

ALT+LEFT        Go back to the last visited directory
ALT+RIGHT       Go forward to the next visited directory

CTRL+          Go to the root directory
CTRL+`          Go to the home directory

DELETE          Delete files

CTRL+C          Copy files to clipboard (not a global one yet)
CTRL+X          Cut files to clipboard (not a global one yet)
CTRL+V          Paste from clipboard to current dir (not a global one yet)

CTRL+D          Open favourite directories (bookmarks)
CTRL+M          Multi-Rename-Tool
CTRL+T          Multi-Rename-Tool

TAB             Switch between left and right file list
CTRL+U          Switch between left and right file list
CTRL+.          Copy the current working directory from the inactive file-list
                to the active one
CTRL+SHIFT+.    Copy the current working directory from the active file-list
                to the inactive one

CTRL+R          Refresh the active file list
CTRL+O          Options dialog
CTRL+SHIFT+H    Toggle hidden files on/off
CTRL+SHIFT+=    Set both panels equal

CTRL+G          FTP Quick Connect
CTRL+F          Connect to FTP server
CTRL+SHIFT+F    Disconnect from FTP server

ALT+Letter(s)
CTRL+ALT+Letter(s)
                Quick search for a file name (starting with specified letter)
                in the current directory

Letter          Redirect to command line, cursor jumps to command line
ESC             Clear the command line

CTRL+K          Delete to the end of line
CTRL+W          Delete the word to the left of the cursor
CTRL+T          Delete the word to the right of the cursor

CTRL+P          Add the full path of the current directory to the command line

CTRL+ENTER      Add the file name under the cursor in the source directory
                to the end of the command line

CTRL+SHIFT+ENTER
                Add the file name under the cursor including its path
                to the end of the command line

CTRL+DOWN or ALT+F8
                A list with the latest command lines (history list) is opened.
                Use the UP and DOWN cursor keys to select an entry. By pressing
                the LEFT or RIGHT key, you can edit the command line. This
                automatically closes the list