Where can I find my (current shell process') PID?

Question

I'm on OS X using ZSH (have lots of homebrew stuff, too).

I'd like to know the PID of my current terminal.

(I'm learning more about process management on *nix systems, pstree and the like, and so this is more an academic question vs. a specific use case I'm trying to solve)

EDIT: to clarify, I'm referring to the process that is running my current terminal/commandline.

What you're looking for is the PID of your current *shell process*. In your case, that's going to be a `zsh` process. The terminal doesn't have a PID. — Keith Thompson, Mar 05 '12 at 04:57
Thanks for clarifying what I was looking for. Updating the Question to be more searchable. — John Hinnegan, Mar 05 '12 at 05:36

score 19 · Accepted Answer · answered Mar 05 '12 at 04:43

19

The special variable $$ is the current pid of the shell you are running, for any Bourne compatible (and, so, POSIX) shell.

answered Mar 05 '12 at 04:43

Daniel Pittman

3,688
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And for csh and tcsh (and Perl). – Keith Thompson Mar 05 '12 at 04:56
Works in Ruby too – PJSCopeland Apr 19 '16 at 02:30
1

`$fish_pid` (though `$$` will warn you, and tell you about `$fish_pid`) – OJFord Nov 13 '18 at 22:28

Where can I find my (current shell process') PID?

1 Answers1