what is the command+k ( in mac ) equivalent in ubuntu
Solution 1:
Clearing the screen
This will work for both Mac OS X and *nix:
Ctrl-l
My answer assumes the default terminal emulators for bash, tcsh (default for Mac OS X) or zsh.
Deleting the scrollback buffer (more like ⌘K)
This has been asked/answered elsewhere.
Solution 2:
^L - the equivalent to 'clear' command
I guess this is what you were searching for
Solution 3:
This is not a key chord, but if you want to clear your terminal and recover it if it gets hosed, you can use the 'reset' command. I know this works in linux and BSD, not sure about OSX.