Useful Emacs Command Summary

Menu Keyboard shortcut What it does
Simple edit commands:
File>Open Ctrl-x Ctrl-f Open an existing file or create a new file
File>Save Ctrl-x Ctrl-s Save the current file
File>Exit Ctrl-x Ctrl-c Quit Emacs
Edit>Undo Ctrl-x u Undo
  Ctrl-s <string> Search forward for <string>
  Ctrl-r <string> Search backward for <string>
  Ctrl-g Return to where search started (in search mode)
  Ctrl-x Ctrl-b Show buffer list
  Ctrl-x k Kill current buffer
  Ctrl-a Move cursor to beginning of line
  Ctrl-e Move cursor to end of line
  Ctrl-k Kill (remove) current line
Cut and paste commands:
  Ctrl-space Set the 'mark' at current cursor position
Edit>Copy Alt-w Copy everything from the 'mark' until current cursor position. Alternatively, this section can be highlighted with your mouse.
Edit>Cut Ctrl-w Cut everything from the 'mark' until current curser position .
Edit>Paste Ctrl-y Paste the last section that was cut or copied.
Window Commands:
 

Ctrl-x 2

Split window vertically
  Ctrl-x 1 Close all windows except the one the cursor is in

 

Useful gdb Debugger Commands

(short version of the command is in parenthesis)

Meta-x gud-gdb Start gdb in current window
File <executable file name> Load executable to debug
break (b) <line number / function name> Place a breakpoint
run [<arguments>] Run a program
print (p) <variable name> Print variable value
step (s) Step to the next line (step into functions)
next (n) Go to the next line (step over functions)
continue (c) Continue to next break point, or end of program
help (h) Help
quit (q) Quit