# Process name and $0 **URL:** \ **Category:** Ruby\ **Created:** [April 20, 2007, 10:12am UTC](https://www.ruby-forum.com/t/process-name-and-0/92524 "2007-04-20T10:12:59Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Bertram\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/54ee81/32.png) [@Bertram\_S](https://www.ruby-forum.com/u/Bertram_S)\ **Post date:** [April 20, 2007, 10:12am UTC](https://www.ruby-forum.com/t/process-name-and-0/92524/1 "2007-04-20T10:12:59Z")
Hi, the following might be Linux specific. Running Irb and having a look into the process table looks like this: $ ps aux | grep [i]rb user 30546 1.3 1.0 7880 5328 pts/3 S+ 09:49 0:00 irb $ ps -A | grep irb 30546 pts/3 00:00:00 irb $ pgrep irb 30546 $ ruby -pe ‘sub “\0”, “\n”’ /proc/30546/cmdline irb $ cat /proc/30546/stat 30546 (irb) S … $ cat /etc/gentoo-release Gentoo Base System release 1.12.9 Now, I’m running a daemon written in Ruby that I want to appear under its own name rather than “ruby” in ps, pstree, top and so forth. Having a look at Irb’s source code and at `rb_define_hooked_variable()' in`ruby.c’ shows me that setting $0 does at least partially what I want. It works for the ‘ps -A’ call and for the ‘cmdline’ output. ‘pgrep’ still doesn’t respond and ‘stat’ still contains “ruby”. I cannot find it: How does Irb manage to change the process name in its higher sense? Thanks for any hints in advance. Bertram ---
**Author:** ![Bertram\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/54ee81/32.png) [@Bertram\_S](https://www.ruby-forum.com/u/Bertram_S)\ **Post date:** [April 20, 2007, 11:42am UTC](https://www.ruby-forum.com/t/process-name-and-0/92524/2 "2007-04-20T11:42:11Z")
Hi, Am Freitag, 20. Apr 2007, 17:12:06 +0900 schrieb Bertram S.: > top and so forth. > […] > I cannot find it: How does Irb manage to change the process > name in its higher sense? Just when I had dispatched the posting I found it: The shebang line must be the latter of: #!/usr/bin/env ruby #!/usr/bin/ruby Bertram