Terminal control/Clear the screen: Difference between revisions
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Delegating to clear on terminal enabled OS(Mac Os, Linux) |
Delegating to clear on terminal enabled OS(Mac Os, Linux) |
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<lang Mathematica>Run["clear"];</lang> |
<lang Mathematica>Run["clear"];</lang> |
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=={{header|Octave}}== |
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<lang Octave> system clear;</lang> |
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<lang Octave> system('clear');</lang> |
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=={{header|Pascal}}== |
=={{header|Pascal}}== |
Revision as of 19:08, 7 February 2012
You are encouraged to solve this task according to the task description, using any language you may know.
Clear the terminal window.
Ada
For systems with ANSI terminal handling:
<lang Ada>with Ada.Text_IO; procedure CLS is begin
Ada.Text_IO.Put(ASCII.ESC & "[2J");
end CLS;</lang>
AutoHotkey
Reference: http://www.autohotkey.com/forum/topic76532.html <lang AHK>RunWait %comspec% /c cls</lang>
AWK
<lang awk>system("clear")</lang>
BASIC
<lang qbasic>CLS</lang>
Batch File
<lang command>CLS</lang>
Blast
<lang blast>clear</lang>
C
The C version of the Minesweeper game uses curses.
If perhaps clear screen isn't used, call the function cls
to do the trick.
<lang C>void cls(void) {
int printf(char*,...); printf("%c[2J",27);
}</lang>
C#
<lang csharp>System.Console.Clear();</lang>
Euphoria
<lang Euphoria>clear_screen()</lang>
Forth
<lang forth>page</lang>
Go
<lang go>package main
import (
"os" "os/exec"
)
func main() {
c := exec.Command("clear") c.Stdout = os.Stdout c.Run()
}</lang>
GUISS
This will only work if the terminal is sitting at a prompt. <lang guiss>Window:Terminal,Type:clear[enter]</lang>
GW-BASIC
<lang qbasic>10 CLS</lang>
Icon and Unicon
Example works for both Icon and Unicon. Determine which system command to call by querying &features at run time. Alternately, the related preprocessor symbols can be used to select the operating system. <lang Icon>procedure main ()
if &features == "MS Windows" then system("cls") # Windows else if &features == "UNIX" then system("clear") # Unix
end</lang>
J
Note: this is specific the java+gdi based J ide. <lang j>smwrite_jijs_ </lang>
Logo
<lang logo>cleartext</lang> There is a separate command to reset the turtle graphics window. <lang logo>clearscreen cs ; abbreviation for clearscreen clean ; like cs, but doesn't reset turtle position</lang>
Lua
<lang lua>os.execute( "clear" )</lang> will not work because "clear" is not a command
Mathematica
Delegating to clear on terminal enabled OS(Mac Os, Linux) <lang Mathematica>Run["clear"];</lang>
Octave
<lang Octave> system clear;</lang> <lang Octave> system('clear');</lang>
Pascal
<lang Pascal>clrscr;</lang>
Perl
Assuming some ANSI terminal, easiest way is call your system's clear command: <lang perl>system('clear')</lang>
If it's needed often: <lang perl>$clear = `clear`; # clear simply prints some escape sequence, cache it
- ... later:
print $clear;</lang>
PicoLisp
<lang PicoLisp>(call 'clear)</lang>
PowerShell
<lang powershell>Clear-Host</lang>
ProDOS
<lang ProDOS>clearscurrentscreentext</lang>
PureBasic
Clears the whole console content using the current background color. <lang PureBasic>ClearConsole()</lang>
Python
To clear the screen on windows, replace 'clear' with 'cls'
<lang python> import os os.system('clear') </lang>
or similar to C example
<lang python> print "%c[2J" % (27) </lang>
Retro
<lang Retro>clear</lang>
REXX
The REXX programming language does not include a facility to clear the screen. However, it is possile to execute an external system command to achieve this task:
'clear'
There are also various workarounds which are platform specific:
regina
The regina interpreter supports the rexxcurses plugin, which provides the facility to clear the screen:
Seed7
The function clear is portable and clears the console window. Clear is based on terminfo respectively the Windows console API. A portable function to clear cannot rely on shell respectively cmd.exe commands, because Windows uses CLS and Unix shells use CLEAR, to clear a screen. ANSI terminal escape sequences are also not 100% portable, since not all terminals accept them.
<lang seed7>$ include "seed7_05.s7i";
include "console.s7i";
const proc: main is func
local var text: console is STD_NULL; begin console := open(CONSOLE); clear(console); # Terminal windows often restore the previous # content, when a program is terminated. Therefore # the program waits until Return/Enter is pressed. readln; end func;</lang>
Smalltalk
<lang Smalltalk> Transcript clear. </lang>
Tcl
This only works on systems with ANSI terminal handling, i.e., Unix platforms. <lang tcl>puts -nonewline "\033\[2J" flush stdout</lang>
UNIX Shell
The clear command can be used to clear the terminal screen:
<lang bash>clear
- Alternative method using tput
tput clear</lang>