bash - 如何在 bash 上监听命令？

Question

每当在 bash 中运行特定命令时，我都会尝试写入 webhook。例如，当ls被调用时，运行一个脚本。

更具体地说，当命令spark运行时，我想使用他们的 webhook 写入一个松弛通道。

Answer 1

Put a wrapper earlier in the PATH. Let's say that spark is in /usr/bin. If your users' PATHS have /usr/local/bin before /usr/bin, then you can do this in /usr/local/bin/spark:

#!/bin/sh
[ "${_SPARK_WRAPPER_DONE}" ] || send-to-slack-here "$@"
export _SPARK_WRAPPER_DONE=1
exec /usr/bin/spark "$@"

...where send-to-slack-here, of course, is your code to send a message to Slack.

You could also move /usr/bin/spark to /usr/bin/spark.real and put your wrapper in the original executable's place.

---

If you control .bashrc, you could also use a shell function (though this will work in fewer scenarios):

spark() {
  send-to-slack-here "$@"
  /usr/bin/spark "$@"
}