bash 确定终端类型（经典 Unix 终端 vs 图形终端）
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Determining the type of terminal (classic Unix terminal vs graphical terminal)
提问by prcastro
I'm configuring my prompt (PS1) via .bashrcand found one issue with my current configuration: I am using a 256 color scheme. This is not compatible with the classical terminal (accessible via e.g. Ctrl+Alt+F2) but looks beautiful in graphical terminals such as gnome-terminal, terminator, etc.
我正在PS1通过.bashrc配置我的提示 ( )并发现我当前的配置存在一个问题：我使用的是 256 配色方案。这不是与经典的终端兼容（可通过例如Ctrl+ Alt+ F2），但看起来美丽在图形终端，诸如侏儒末端，终止子等。
So I have to change my prompt depending on the type of terminal. To do this, I need a condition for ifclause to test the type of terminal. Do you know how to do this?
所以我必须根据终端的类型更改我的提示。为此，我需要一个条件 forif子句来测试终端的类型。你知道怎么做吗？
回答by uml?ute
the TERMvariable indicates the terminal type.
when running in an x-terminal, it is usually xterm(but can also be xterm-color-256as Dmitry has hinted in his answer).
the following code checks whether the value of $TERM starts with xterm(and thus catches several cases):
该TERM变量指示的终端类型。在 x 终端中运行时，通常是xterm（但也可以xterm-color-256像 Dmitry 在他的回答中暗示的那样）。以下代码检查 $TERM 的值是否以xterm（并因此捕获了几种情况）开头：
case "$TERM" in
xterm*)
echo "running as an x-terminal"
;;
*)
echo "not running as an x-terminal"
;;
esac
回答by Varun
echo $TERMwould give you the terminal type
echo $TERM会给你终端类型
回答by glenn Hymanman
Another approach: look at the parent process of the current shell. If its "login", you're in a console
另一种方法：查看当前shell的父进程。如果是“登录”，则您在控制台中
parent=$(ps --pid $(ps --pid $$ --no-headers --format ppid) --no-headers --format cmd)
if [[ $parent == login* ]]; then
echo console
PS1='plain> '
else
echo assume you can get away with more
PS1='fancy> '
fi
回答by Dmitry
This should work:
这应该有效：
if [ "$TERM" == "xterm-color-256" ]; then echo "YES"; fi
回答by David W.
You could use the value of $TERMto decide if you have a color terminal or not, but this value could be modified. The question is where this environment variable is being set when a new terminal window is opened.
您可以使用 的值$TERM来决定是否有彩色终端，但可以修改此值。问题是当打开一个新的终端窗口时，这个环境变量在哪里设置。
This would be in the .bashrcfile. However, a word of warning:
这将在.bashrc文件中。但是，警告一句：
- The value of
$TERMmay be a lie. This is just an environment variable that's set. How it is set is determined by the terminal program (on the Mac, theTerminal.appcan set the terminal toxterm,xterm-color,vt100,ansi, and several others.. - The terminal could be a color terminal, but doesn't use ANSI color codes. You could be in trouble if you simply assume that a particular escape sequence gets you a particular color.
- If your prompt is set in the
.bashrcfile, changing the value of$TERMwon't change the prompt.
- 的价值
$TERM可能是谎言。这只是一个设置的环境变量。它是如何集由终端程序（确定在Mac上，则Terminal.app可以设置终端xterm，xterm-color，vt100，ansi，和其他几个人.. - 终端可以是彩色终端，但不使用 ANSI 颜色代码。如果您只是假设特定的转义序列会为您提供特定的颜色，那么您可能会遇到麻烦。
- 如果您在
.bashrc文件中设置了提示，则更改 的值$TERM不会更改提示。
That said, I would probably do something like this:
也就是说，我可能会做这样的事情：
case $TERM in
*color*) PS1=...;;
*) PS1=...;;
esac
This way, my terminal will be set to color if I said it was an xterm-coloror xterm-256color.
这样，如果我说它是一个xterm-color或，我的终端将被设置为彩色xterm-256color。
