Linux自定义别名如何获取参数？传递参数至kill命令别名方法

Hey there! Great question—bash aliases don’t actually support direct parameter passing like you’re attempting with $input. The issue is that aliases are just simple string replacements; they don’t handle positional arguments (like the firefox in your close firefox example) the way you need.

But don’t worry, the fix is easy: replace your alias with a bash function. Functions are designed to accept arguments, and they work perfectly for this use case.

Here’s How to Set It Up #

Instead of your alias, add this function to your .bash_aliases file:

close() {
    # Kill all processes matching the input argument, excluding the grep process itself
    kill $(ps -A | grep "$1" | grep -v grep | awk '{print $1}')
}

A Few Simplified Alternatives #

If you want a cleaner, more robust version, you can skip the pipe chain entirely with built-in tools:

• Use pgrep to directly get process IDs for the target app:

  close() {
      kill $(pgrep "$1")
  }
  

• Even better, use pkill which combines pgrep and kill into one step:

  close() {
      pkill "$1"
  }
  

How to Activate It #

After saving the function in .bash_aliases, either restart your terminal or run this command to apply changes right away:

source ~/.bash_aliases

Now you can run close firefox (or any other app name) and it’ll kill all matching processes.

Why Your Original Aliase Failed #

When you defined your alias with $input, bash tried to expand $input at the moment you created the alias (not when you ran it). Since $input wasn’t set then, the alias ended up being kill $(ps -A | grep | awk "{print $1}")—which is why passing an argument did nothing. Functions, on the other hand, keep the $1 placeholder until you run the command, where it gets replaced with your actual input.

内容的提问来源于stack exchange，提问作者Chico