bash - 如何找到当前的 shell 命令
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bash - how to find current shell command
提问by Neo
When I run a command, I need to set some shell environment variable that holds the current command from inside ".bashrc". Actually I need to update PROMPT_COMMAND whenever a command is run, and I need the whole command line, from where I will pick relevant value.
当我运行一个命令时，我需要设置一些 shell 环境变量来保存“.bashrc”中的当前命令。实际上，无论何时运行命令，我都需要更新 PROMPT_COMMAND，并且我需要整个命令行，从中我将选择相关值。
PROMPT_COMMAND='TITLE=`echo !!`; echo $TITLE;'
I tried using echo !!inside .bashrc but this simply gives me !!as title. Any ideas?
我尝试echo !!在 .bashrc 中使用，但这只是给了我!!标题。有任何想法吗？
回答by Paused until further notice.
回答by simon
okay - now that you've clarified your question, I'll offer a different answer.
好的 - 现在你已经澄清了你的问题，我会提供一个不同的答案。
Actually, the value you want isn't available as an environment variable, but how about this:
实际上，您想要的值不能用作环境变量，但是如何：
tail -n 1 $HOME/.bash_history
am I getting warmer? :)
我越来越暖和了吗？:)
edit:
编辑：
note, if you want to use this in your PROMPT_COMMAND, what you'll need to do it this:
请注意，如果你想在你的 中使用它，你PROMPT_COMMAND需要这样做：
export PROMPT_COMMAND='history -a; tail -n 1 $HOME/.bash_history'
hope this helps :)
希望这可以帮助 ：）
回答by simon
not sure exactly what you need, but it should be in here -- try it :)
不确定你到底需要什么，但它应该在这里——试试吧:)
#!/bin/bash
echo "# arguments called with ----> ${@} "
echo "# $1 -----------------------> "
echo "# $2 -----------------------> "
echo "# path to me ---------------> ##代码## "
echo "# parent path --------------> ${0%/*} "
echo "# my name ------------------> ${0##*/} "
