[Bug 246722] ktrace(1): Add example to trace all processes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246722

            Bug ID: 246722
           Summary: ktrace(1): Add example to trace all processes
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: kevinz5000 at gmail.com

Created attachment 214846
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214846&action=edit
Patch

It is not immediately obvious how to use ktrace(1) to trace all running
processes. This patch adds an example to the ktrace(1) man page.

     As root, enable system call tracing on all processes (since all processes  
     descend from init(8) ):                                                    
           # ktrace -t c -dp 1

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