1/10/2023 0 Comments Color oracle test online![]() ![]() That might seem silly at first-because you're probably not going to set your terminal to underline all text and blink all day-but it can be useful for select functions. With ANSI codes, you can control the background color of your text as well as do some rudimentary styling.įor instance, with \033[4m, you can cause text to be underlined, or with \033[5m you can set it to blink. You're not limited to setting the color of your text. For a green prompt, use the ANSI code for green before your prompt character and end it with the code representing your normal default color: export PS1= ` printf "\033[32m$ \033[39m" ` Foreground and background For example, if you regularly SSH into your server, you can set your server prompt to green to help you differentiate it at a glance from your local prompt. For example, typing this code changes the subsequent text to green: $ printf '\033[32m'Īs long as you see color the same way your computer does, you could use color to help you remember what system you're logged into. ![]() It doesn't clear your history it just clears up the screen in your terminal emulator, so it's a safe and demonstrative ANSI escape sequence.ĪNSI also has sequences to set the color of your terminal. For instance, this sequence clears the screen up to the next prompt: $ printf `\033 [2J ` These are special sequences of characters that a terminal interprets as actions instead of characters. Modern terminals have inherited ANSI escape sequences for "meta" features. Save the file, and reload your settings: $ source ~ /.bashrc ANSI color codes You can do this by exporting the TERM variable in your ~/.bashrc configuration file: export TERM=xterm-256color If your terminal is set to a profile with very few features, but you know the emulator you use is capable of more, then you can change your setting by defining the TERM environment variable. Most software doesn't care what terminal type you're using in rare instances, you might get a warning or error about an incorrect terminal type when logging into a server that checks for compatible features. These files list features available in different kinds of terminals, many of which are defined by historical hardware: there are definitions for vt100 through vt220, as well as for modern software emulators like xterm and Xfce. The modern version of that is terminfo, located in either /etc or /usr/share, depending on your distribution. The obsolete (but still maintained on some systems in the interest of backward compatibility) /etc/termcap file defined the capabilities of terminals and printers. ![]()
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