Okay, I have been researching on how to do this, but say I am running a program that has a whole bit of output on the terminal, how would I clear the screen from within my program so that I can keep my program running?
好吧，我一直在研究如何做到这一点，但是说我正在运行一个在终端上有一点输出的程序，我如何从程序中清除屏幕以便我可以保持程序运行？
I know I can just type clear in terminal and it clears it fine, but like I said, for this program it would be more beneficial for me.
我知道我可以在终端输入清除它清除它很好，但就像我说的，对于这个程序，它对我来说会更有益。
I found something that works, however, I'm not sure what it is or what it is doing.
我找到了一些有效的东西，但是，我不确定它是什么或它在做什么。
cout << "\033[2J\033[1;1H";
That works but I have no clue what it is, if you could explain it, than I would much appreciate it.
这是有效的，但我不知道它是什么，如果你能解释它，我会非常感激。
3 个解决方案
#1
36
These are ANSI escape codes. The first one (\033[2J) clears the entire screen (J) from top to bottom (2). The second code (\033[1;1H) positions the cursor at row 1, column 1.
这些是ANSI转义码。第一个（\ 033 [2J]从上到下清除整个屏幕（J）（2）。第二个代码（\ 033 [1; 1H）将光标定位在第1行第1列。
All ANSI escapes begin with the sequence ESC[, have zero or more parameters delimited by ;, and end with a command letter (J and H in your case). \033 is the C-style octal sequence for the escape character.
所有ANSI转义都以序列ESC [开头，有零个或多个参数由;分隔，并以命令字母结束（在您的情况下为J和H）。 \ 033是转义字符的C风格八进制序列。
See here for the full roadshow.
在这里查看完整的路演。
#2
9
Instead of depending on specific escape sequences that may break in unexpected situations (though accepting that trade-off is fine, if it's what you want), you can just do the same thing you'd do at your shell:
而不是依赖于可能在意外情况下中断的特定转义序列（虽然接受权衡很好，如果它是你想要的），你可以做你在shell上做的同样的事情：
std::system("clear");
Though generally system() is to be avoided, for a user-interactive program neither the extra shell parsing nor process overhead is significant. There's no problem with shell escaping either, in this case.
虽然通常要避免使用system（），但对于用户交互式程序来说，额外的shell解析和进程开销都不重要。在这种情况下，shell转义也没有问题。
You could always fork/exec to call clear if you did want to avoid system(). If you're already using [n]curses or another terminal library, use that.
如果你想避免使用system（），你总是可以fork / exec来调用clear。如果您已经在使用[n] curses或其他终端库，请使用它。
#3
0
For portability you should get the string from termcap's cl (clear) capability (Clear screen and cursor home). (Or use std::system("clear") as told by Roger Pate).
为了便于携带，你应该从termcap的cl（清除）功能中获取字符串（Clear screen和cursor home）。 （或者使用std :: system（“clear”），如Roger Pate所述）。
man 3 termcap (in ncurses)
man 5 termcap
set | grep TERMCAP
man 3 termcap（在ncurses中）man 5 termcap set | grep TERMCAP
#1
36
These are ANSI escape codes. The first one (\033[2J) clears the entire screen (J) from top to bottom (2). The second code (\033[1;1H) positions the cursor at row 1, column 1.
这些是ANSI转义码。第一个（\ 033 [2J]从上到下清除整个屏幕（J）（2）。第二个代码（\ 033 [1; 1H）将光标定位在第1行第1列。
All ANSI escapes begin with the sequence ESC[, have zero or more parameters delimited by ;, and end with a command letter (J and H in your case). \033 is the C-style octal sequence for the escape character.
所有ANSI转义都以序列ESC [开头，有零个或多个参数由;分隔，并以命令字母结束（在您的情况下为J和H）。 \ 033是转义字符的C风格八进制序列。
See here for the full roadshow.
在这里查看完整的路演。
#2
9
Instead of depending on specific escape sequences that may break in unexpected situations (though accepting that trade-off is fine, if it's what you want), you can just do the same thing you'd do at your shell:
而不是依赖于可能在意外情况下中断的特定转义序列（虽然接受权衡很好，如果它是你想要的），你可以做你在shell上做的同样的事情：
std::system("clear");
Though generally system() is to be avoided, for a user-interactive program neither the extra shell parsing nor process overhead is significant. There's no problem with shell escaping either, in this case.
虽然通常要避免使用system（），但对于用户交互式程序来说，额外的shell解析和进程开销都不重要。在这种情况下，shell转义也没有问题。
You could always fork/exec to call clear if you did want to avoid system(). If you're already using [n]curses or another terminal library, use that.
如果你想避免使用system（），你总是可以fork / exec来调用clear。如果您已经在使用[n] curses或其他终端库，请使用它。
#3
0
For portability you should get the string from termcap's cl (clear) capability (Clear screen and cursor home). (Or use std::system("clear") as told by Roger Pate).
为了便于携带，你应该从termcap的cl（清除）功能中获取字符串（Clear screen和cursor home）。 （或者使用std :: system（“clear”），如Roger Pate所述）。
man 3 termcap (in ncurses)
man 5 termcap
set | grep TERMCAP
man 3 termcap（在ncurses中）man 5 termcap set | grep TERMCAP