The following screenshot shows running the utility in interactive mode. This utility loads a file that is managed by the Debian update-alternatives utility (the Ubuntu flavors are derivatives of Debian and so have much in common). The Xubuntu distribution includes the setvtrgb utility that is run each time the system starts. Like everything else in Linux, this too may be configured. If you rarely work in the Console, this may not matter too much, but there will probably be that one time… Configuring the Linux console color palette The Xubuntu theme is lower contrast than Debian and results in certain color highlights being more difficult to read. One could reasonably expect a color scheme like this from Debian‘s Linux console:īut then your program is run on Xubuntu‘s Linux console with a scheme like this:įor the programmer that chooses color combinations for readability, a theme like this can be a headache as there is no feedback from the Linux console or terminal emulator that tells the program what the color scheme actually looks like to the user.Īs another set of examples, here is Midnight Commander in Debian and Xubuntu: The assignment of the environment variables in ~/.bashrc used in the PS1 prompt and less showed this ordering. The eight common colors are black, red, green, yellow, blue, magenta, cyan, and white and are numbered from 0 through 7, respectively. Fortunately, modern POSIX terminals don’t suffer from this limitation and many support 256 colors or even more! To keep things simple this post will consider the common case of eight foreground and eight background colors. Note that it is possible that on some ancient terminals only eight colors are available or none other than gray scale (or green or amber). To back up a bit, in the previous post it was left unstated but implied that the Linux console and XTerm terminals traditionally have eight colors available for foreground (text color) and the same eight for background. Desktop theme authors desire to extend their creativity to the Linux console and that is where the trouble begins. Now themes are not a bad thing as they help to give a desktop a cohesive look across applications. A legitimate question is why would red not be red or magenta not be magenta? In a word, themes. In the previous post about ANSI escape sequences, terminfo, and the tput utility, what I did not mention is that even though a given color such as blue or cyan is requested, it is beyond the program’s control the actual color the user will see.
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