gnome-terminal（或VTE）将$ TERM设置为xterm而不是xterm-256color [英] gnome-terminal (or VTE) sets $TERM to xterm rather than xterm-256color
问题描述
有没有令人信服的理由为什么 gnome-terminal （并且在引擎盖下，也许 VTE 小部件）将 $ TERM 设置为 xterm 而不是 xterm-256color ？显然它支持256种颜色。
Is there a compelling reason why gnome-terminal (and, under the hood, maybe the VTE widget) sets $TERM to xterm rather than xterm-256color? Clearly it supports 256 colors.
有一段时间，我在我的 .bashrc / .zshrc 简单地 export TERM = xterm-256color ，因为这通常是我正在使用的终端模拟器。但是，然后我打开 tmux ，并且许多CLI应用程序中的行为/颜色错误，例如 emacs 和 htop ，因为 tmux 会将 TERM 变量设置为screen- 256color，然后，shell加载并执行我的。* rc 文件，然后设置 TERM 不正确。
For a while, I had a line in my .bashrc/.zshrc to simply export TERM=xterm-256color, because that's usually the terminal emulator that I'm using. But then I open up tmux, and the behavior / colors are wrong in many CLI applications, such as emacs and htop, because tmux will set the TERM variable to screen-256color, then the shell loads and executes my .*rc file, which then sets the TERM incorrectly.
现在，我有：
if [ "$TERM" != "screen-256color" ]; then
export TERM="xterm-256color"
fi
这样，因为如果有一天我打破了我实际的VT-220或使用不同的终端模拟器？
I don't like this, because what if one day I break out my actual VT-220 or use a different terminal emulator?
推荐答案
很久以前，人们曾经看过 $ COLORTERM ，如果这样设置（连同 TERM = xterm ）他们将它切换到 TERM = xterm-256colors 。
For a long time, people used to look at $COLORTERM, and if that was set (along with TERM=xterm) they switched it to TERM=xterm-256colors instead.
之后，gnome-terminal（实际上是vte） $ COLORTERM ，但是引入了 $ VTE_VERSION 。
Later, gnome-terminal (actually vte) removed setting $COLORTERM, but introduced $VTE_VERSION.
最新版本（gnome-terminal 3.16，vte 0.40）立即设置 TERM = xterm-256color （再次不太正确，因为它支持16M颜色，但没有办法在terminfo中表示它。）
The newest version (gnome-terminal 3.16, vte 0.40) sets TERM=xterm-256color right away (which is again not quite correct, because it supports 16M colors, but there's no way to denote it in terminfo.)
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