mjhjmtu

You can use the reset command, that will reset the terminal settings.

I know you're on a gnome terminal, but I thought I'd answer with a tip for others who might be (like me) on a Mac:

If you're using Terminal.app or iTerm.app then Control+L will scroll up so the terminal looks blank, but Cmd+K will actually reset the terminal / clear scroll-back.

Or, if you're able to set keyboard preferences for your terminal you may be able to assign something like Ctrl+K to input echo -e \033c as was mentioned above.

Anthon's answer works in KDE Konsole, but not urxvt. In urxvt, I've been using reset for a few years to clear the scrollback (along with all the other things it does), and wasn't satisfied that it didn't work in Konsole. So now for Linux I have a new alias:

alias allclear='clear; echo -e "33ce[3J"'

But it doesn't work on OS X.

tput reset doesn't work in any context AFAICT.

In KDE Konsole, ctrl-shift-k clears the scrollback (including the current shell prompt, so it's completely empty). In iTerm or Apple's terminal on OS X, cmd-shift-k also clears scrollback. To add this feature to urxvt, add this to ~/.Xresources:

urxvt*keysym.C-S-K: command:33c

I found this on the net years ago, and works well for me. It completely clears the terminal with no scroll history.

echo -e "e[3J"

I mapped F12 to clear screen in each of the following shells: bash, csh and fish shell.
My command is different from all previous ones because it preserves whatever you've already typed in the current line.
(Note: all the configurations below are terminal dependent, but I hope they will work virtually everywhere)

bash

Open the file ~/.inputrc and insert the following line:

"e[24~": "C-k C-uecho -ne '\ec\e[3J'; history -d $((HISTCMD-1))nC-yC-?"

To have the new key binding available, either open a new terminal or type Ctrl+X then Ctrl+R to reload the .inputrc file in the current terminal.

Explanation

The file ~/.inputrc controls the key bindings of the bash terminal.

About the line:

1. The first part of the line, "e[24~", maps the key F12.


2. The C-k (Ctrl+X) clears the kill-ring (bash's copy-and-past memory).


3. The space avoids a beep in the next command.


4. The C-u (Ctrl+U) sends the current line to the kill-ring, and erase it.


5. The echo -ne '\ec\e[3J'; history -d $((HISTCMD-1))n sends two grouped commands to the terminal. They are separated by ; and terminated by n.
   
   
   • The echo -ne '\ec\e[3J' clears the screen.
     
   
   
   • The history -d $((HISTCMD-1)) avoids these two commands from entering in history.
   
   


6. The C-y (Ctrl+Y) pastes the kill-ring stored by the C-u command.


7. The C-? (Ctrl+?) is equivalent to Backspace and removes the space inserted in step 3 above.

References:

• How to bind a function key to a command in bash (and how to prevent Ctrl+U from ringing):
  https://stackoverflow.com/a/4201274/1669975
  


• How to reload the .inputrc file: https://superuser.com/a/241190/595358
  


• How to execute a command without keeping it in history: https://stackoverflow.com/a/33511637/1669975
  

csh

Type the command bellow.
bindkey -c "^[[24~" "echo -ne 'ece[3J'"

It can also be inserted in your .cshrc file to load the key binding to every new terminal.
(Yes, it is much simpler than in bash)

fish shell

Type the command bellow.
bind -k f12 "echo -ne 'ece[3J'; commandline -f repaint"

You can edit and save the function fish_user_key_bindings to load the key binding to every new terminal.
(Yes, it is much simpler than in bash)

For me, using PuTTY against CentOS 7, clear leaves only the clear command in the scrollback, but running "clear && clear", two instances of the clear command at the same time, completely clears the scrollback and leaves me with no scrollbar. Try that. It's a weird solution but none of these here cleared the scrollback that effectively, and this does.

[Ubuntu 16.04]

The .bash_history file is created in the user's home directory once the terminal is closed

It is useful, but you could delete it if you wish.. Nevertheless it would be created every time you finish using the terminal.

You could delete it manually from:

• your files browser.




• the terminal: remember that a new .bash_history file will be created when you close the terminal (based in its default configuration).

Or you can call a custom function if you save the functionality you need into a file linked from the bashrc.. you could edit the bashrc itself if you like putting your code there, but the next examples are in a separate file

Honestly this is not useful for me but if you wish is to delete the commands history before exit you could do this:


.bash_custom #this is my custom file

blotout() 
 HISTSIZE=0
 rm $HOME/.bash_history
 exit

then at the bottom of add the name and path of my file

.bashrc # this is the configuration file for the bash (I think)

# existent code
#...
#..

# import user customizations
source $HOME/.bash_custom

and thatś all.

BUT, to do exactly what you want you just need this function in your custom file and link it:

refresh() 
 tput reset
 H=HISTSIZE
 HISTSIZE=0
 HISTSIZE=H

Or just put the function in the .bashrc if you want but that way you probably need an export statement after the function I'm not sure and if the file is updated probably lost your functions.. I'm not sure about that too :D .

Remember you have to re-start the terminal when edit the .bashrc or your 'custom' file.

Added to ~/.inputrc to bind the complete clearing to F12:

"e[24~":'!echo -ne 47\0033\014347r'