Bash - 通过运行第二个命令更新终端标题 [英] Bash - Update terminal title by running a second command

问题描述

在我的 Ubuntu 终端上，我经常运行长时间运行的程序.而且由于有很多这样的程序，我总是忘记哪个终端用于哪个程序，除非我浏览所有这些程序.所以我想找到一种方法，每当我运行命令时，将我的终端标题更新为程序名称.我不想手动完成.

On my terminal in Ubuntu, I often run programs which keep running for a long time. And since there are a lot of these programs, I keep forgetting which terminal is for which program, unless I tab through all of those. So I wanted to find a way to update my terminal title to the program name, whenever I run a command. I don't want to do it manually.

我使用 gnome-terminal，但答案不应该真正依赖于此.基本上，如果我能够运行第二个命令，那么我可以简单地使用 gconftool 命令来更新标题.所以我希望找到一种方法来捕获 bash 中的命令并在每个命令之后更新标题.我怎么做?

I use gnome-terminal, but answer shouldn't really depend on that. Basically, If I'm able to run a second command, then I can simply use gconftool command to update the title. So I was hoping to find a way to capture the command in bash and update the title after every command. How do I do that?

推荐答案

我有一些答案给你 :) 你是对的，使用 gnome-terminal 并不重要，但使用什么命令很重要你正在使用的外壳.这在 zsh 中要容易得多，但在接下来的内容中，我将假设您使用的是 bash，并且它是一个相当新的版本 (> 3.1).

I have some answers for you :) You're right that it shouldn't matter that you're using gnome-terminal, but it does matter what command shell you're using. This is a lot easier in zsh, but in what follows I'm going to assume you're using bash, and that it's a fairly recent version (> 3.1).

首先:

哪个环境变量会包含当前的命令"?

Which environment variable would contain the current 'command'?

有一个环境变量或多或少你想要什么 - $BASH_COMMAND.只有一个小问题，那就是它只会显示管道中的最后一个命令.我也不是 100% 确定它会用子外壳的组合做什么:)

There is an environment variable which has more-or-less what you want - $BASH_COMMAND. There's only one small hitch, which is that it will only show you the last command in a pipe. I'm not 100% sure what it will do with combinations of subshells, either :)

所以我希望找到一种方法在 bash 中捕获命令并更新每个命令后的标题.

So I was hoping to find a way to capture the command in bash and update the title after every command.

我一直在考虑这个问题，现在我明白你想要做什么，我意识到真正的问题是你需要在每个命令之前更新标题.这意味着 $PROMPT_COMMAND 和 $PS1 环境变量是可能的解决方案，因为它们仅在命令返回之后执行.

I've been thinking about this, and now that I understand what you want to do, I realized the real problem is that you need to update the title before every command. This means that the $PROMPT_COMMAND and $PS1 environment variables are out as possible solutions, since they're only executed after the command returns.

在 bash 中，我能想到的唯一方法是(ab)使用调试信号.所以这里有一个解决方案——把它放在你的 .bashrc 的末尾:

In bash, the only way I can think of to achieve what you want is to (ab)use the DEBUG SIGNAL. So here's a solution -- stick this at the end of your .bashrc:

trap 'printf "33]0;%s07" "${BASH_COMMAND//[^[:print:]]/}"' DEBUG

为了解决管道问题，我一直在搞这个:

To get around the problem with pipes, I've been messing around with this:

function settitle () {
    export PREV_COMMAND=${PREV_COMMAND}${@}
    printf "33]0;%s07" "${BASH_COMMAND//[^[:print:]]/}"
    export PREV_COMMAND=${PREV_COMMAND}' | '
}

export PROMPT_COMMAND=${PROMPT_COMMAND}';export PREV_COMMAND=""'

trap 'settitle "$BASH_COMMAND"' DEBUG

但我不保证它是完美的！

but I don't promise it's perfect!

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